diff --git a/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rule-8-10-17-network-activity-detected-via-kworker.asciidoc b/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rule-8-10-17-network-activity-detected-via-kworker.asciidoc new file mode 100644 index 0000000000..dd4af25a5a --- /dev/null +++ b/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rule-8-10-17-network-activity-detected-via-kworker.asciidoc @@ -0,0 +1,124 @@ +[[prebuilt-rule-8-10-17-network-activity-detected-via-kworker]] +=== Network Activity Detected via Kworker + +This rule monitors for network connections from a kworker process. kworker, or kernel worker, processes are part of the kernel's workqueue mechanism. They are responsible for executing work that has been scheduled to be done in kernel space, which might include tasks like handling interrupts, background activities, and other kernel-related tasks. Attackers may attempt to evade detection by masquerading as a kernel worker process. + +*Rule type*: new_terms + +*Rule indices*: + +* logs-endpoint.events.* + +*Severity*: low + +*Risk score*: 21 + +*Runs every*: 5m + +*Searches indices from*: now-9m ({ref}/common-options.html#date-math[Date Math format], see also <>) + +*Maximum alerts per execution*: 100 + +*References*: None + +*Tags*: + +* Domain: Endpoint +* OS: Linux +* Use Case: Threat Detection +* Tactic: Command and Control +* Data Source: Elastic Defend + +*Version*: 4 + +*Rule authors*: + +* Elastic + +*Rule license*: Elastic License v2 + + +==== Setup + + + +*Setup* + + +This rule requires data coming in from Elastic Defend. + + +*Elastic Defend Integration Setup* + +Elastic Defend is integrated into the Elastic Agent using Fleet. Upon configuration, the integration allows +the Elastic Agent to monitor events on your host and send data to the Elastic Security app. + + +*Prerequisite Requirements:* + +- Fleet is required for Elastic Defend. +- To configure Fleet Server refer to the https://www.elastic.co/guide/en/fleet/current/fleet-server.html[documentation]. + + +*The following steps should be executed in order to add the Elastic Defend integration on a Linux System:* + +- Go to the Kibana home page and click "Add integrations". +- In the query bar, search for "Elastic Defend" and select the integration to see more details about it. +- Click "Add Elastic Defend". +- Configure the integration name and optionally add a description. +- Select the type of environment you want to protect, either "Traditional Endpoints" or "Cloud Workloads". +- Select a configuration preset. Each preset comes with different default settings for Elastic Agent, you can further customize these later by configuring the Elastic Defend integration policy. https://www.elastic.co/guide/en/security/current/configure-endpoint-integration-policy.html[Helper guide]. +- We suggest to select "Complete EDR (Endpoint Detection and Response)" as a configuration setting, that provides "All events; all preventions" +- Enter a name for the agent policy in "New agent policy name". If other agent policies already exist, you can click the "Existing hosts" tab and select an existing policy instead. +For more details on Elastic Agent configuration settings, refer to the https://www.elastic.co/guide/en/fleet/8.10/agent-policy.html[helper guide]. +- Click "Save and Continue". +- To complete the integration, select "Add Elastic Agent to your hosts" and continue to the next section to install the Elastic Agent on your hosts. +For more details on Elastic Defend refer to the https://www.elastic.co/guide/en/security/current/install-endpoint.html[helper guide]. + + +==== Rule query + + +[source, js] +---------------------------------- +host.os.type:linux and event.category:network and event.action:(connection_attempted or connection_accepted) and +process.name:kworker* and not destination.ip:( + 10.0.0.0/8 or + 127.0.0.0/8 or + 169.254.0.0/16 or + 172.16.0.0/12 or + 192.168.0.0/16 or + 224.0.0.0/4 or + "::1" or + "FE80::/10" or + "FF00::/8" +) and not destination.port:2049 + +---------------------------------- + +*Framework*: MITRE ATT&CK^TM^ + +* Tactic: +** Name: Command and Control +** ID: TA0011 +** Reference URL: https://attack.mitre.org/tactics/TA0011/ +* Tactic: +** Name: Defense Evasion +** ID: TA0005 +** Reference URL: https://attack.mitre.org/tactics/TA0005/ +* Technique: +** Name: Masquerading +** ID: T1036 +** Reference URL: https://attack.mitre.org/techniques/T1036/ +* Technique: +** Name: Rootkit +** ID: T1014 +** Reference URL: https://attack.mitre.org/techniques/T1014/ +* Tactic: +** Name: Exfiltration +** ID: TA0010 +** Reference URL: https://attack.mitre.org/tactics/TA0010/ +* Technique: +** Name: Exfiltration Over C2 Channel +** ID: T1041 +** Reference URL: https://attack.mitre.org/techniques/T1041/ diff --git a/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rule-8-10-17-potential-linux-tunneling-and-or-port-forwarding.asciidoc b/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rule-8-10-17-potential-linux-tunneling-and-or-port-forwarding.asciidoc new file mode 100644 index 0000000000..497ed3a065 --- /dev/null +++ b/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rule-8-10-17-potential-linux-tunneling-and-or-port-forwarding.asciidoc @@ -0,0 +1,196 @@ +[[prebuilt-rule-8-10-17-potential-linux-tunneling-and-or-port-forwarding]] +=== Potential Linux Tunneling and/or Port Forwarding + +This rule monitors for a set of Linux utilities that can be used for tunneling and port forwarding. Attackers can leverage tunneling and port forwarding techniques to bypass network defenses, establish hidden communication channels, and gain unauthorized access to internal resources, facilitating data exfiltration, lateral movement, and remote control. + +*Rule type*: eql + +*Rule indices*: + +* logs-endpoint.events.* +* endgame-* + +*Severity*: medium + +*Risk score*: 47 + +*Runs every*: 5m + +*Searches indices from*: now-9m ({ref}/common-options.html#date-math[Date Math format], see also <>) + +*Maximum alerts per execution*: 100 + +*References*: + +* https://blog.bitsadmin.com/living-off-the-foreign-land-windows-as-offensive-platform +* https://book.hacktricks.xyz/generic-methodologies-and-resources/tunneling-and-port-forwarding + +*Tags*: + +* Domain: Endpoint +* OS: Linux +* Use Case: Threat Detection +* Tactic: Command and Control +* Data Source: Elastic Defend +* Data Source: Elastic Endgame + +*Version*: 7 + +*Rule authors*: + +* Elastic + +*Rule license*: Elastic License v2 + + +==== Investigation guide + + + +*Triage and analysis* + + + +*Investigating Potential Linux Tunneling and/or Port Forwarding* + + +Attackers can leverage many utilities to clandestinely tunnel network communications and evade security measures, potentially gaining unauthorized access to sensitive systems. + +This rule looks for several utilities that are capable of setting up tunnel network communications by analyzing process names or command line arguments. + +> **Note**: +> This investigation guide uses the https://www.elastic.co/guide/en/security/master/invest-guide-run-osquery.html[Osquery Markdown Plugin] introduced in Elastic Stack version 8.5.0. Older Elastic Stack versions will display unrendered Markdown in this guide. +> This investigation guide uses https://www.elastic.co/guide/en/security/current/osquery-placeholder-fields.html[placeholder fields] to dynamically pass alert data into Osquery queries. Placeholder fields were introduced in Elastic Stack version 8.7.0. If you're using Elastic Stack version 8.6.0 or earlier, you'll need to manually adjust this investigation guide's queries to ensure they properly run. + + +*Possible investigation steps* + + +- Identify any signs of suspicious network activity or anomalies that may indicate protocol tunneling. This could include unexpected traffic patterns or unusual network behavior. + - Investigate listening ports and open sockets to look for potential protocol tunneling, reverse shells, or data exfiltration. + - !{osquery{"label":"Osquery - Retrieve Listening Ports","query":"SELECT pid, address, port, socket, protocol, path FROM listening_ports"}} + - !{osquery{"label":"Osquery - Retrieve Open Sockets","query":"SELECT pid, family, remote_address, remote_port, socket, state FROM process_open_sockets"}} +- Identify the user account that performed the action, analyze it, and check whether it should perform this kind of action. + - !{osquery{"label":"Osquery - Retrieve Information for a Specific User","query":"SELECT * FROM users WHERE username = {{user.name}}"}} +- Investigate whether the user is currently logged in and active. + - !{osquery{"label":"Osquery - Investigate the Account Authentication Status","query":"SELECT * FROM logged_in_users WHERE user = {{user.name}}"}} +- Investigate the script execution chain (parent process tree) for unknown processes. Examine their executable files for prevalence and whether they are located in expected locations. + - !{osquery{"label":"Osquery - Retrieve Running Processes by User","query":"SELECT pid, username, name FROM processes p JOIN users u ON u.uid = p.uid ORDER BY username"}} + - !{osquery{"label":"Osquery - Retrieve Process Info","query":"SELECT name, cmdline, parent, path, uid FROM processes"}} +- Investigate other alerts associated with the user/host during the past 48 hours. + - If scripts or executables were dropped, retrieve the files and determine if they are malicious: + - Use a private sandboxed malware analysis system to perform analysis. + - Observe and collect information about the following activities: + - Attempts to contact external domains and addresses. + - Check if the domain is newly registered or unexpected. + - Check the reputation of the domain or IP address. + - File access, modification, and creation activities. + + +*Related rules* + + +- Potential Protocol Tunneling via Chisel Client - 3f12325a-4cc6-410b-8d4c-9fbbeb744cfd +- Potential Protocol Tunneling via Chisel Server - ac8805f6-1e08-406c-962e-3937057fa86f +- Potential Protocol Tunneling via EarthWorm - 9f1c4ca3-44b5-481d-ba42-32dc215a2769 +- Suspicious Utility Launched via ProxyChains - 6ace94ba-f02c-4d55-9f53-87d99b6f9af4 +- ProxyChains Activity - 4b868f1f-15ff-4ba3-8c11-d5a7a6356d37 + + +*False positive analysis* + + +- If this activity is related to new benign software installation activity, consider adding exceptions — preferably with a combination of user and command line conditions. +- If this activity is related to a system administrator or developer who uses port tunneling/forwarding for benign purposes, consider adding exceptions for specific user accounts or hosts. +- Try to understand the context of the execution by thinking about the user, machine, or business purpose. A small number of endpoints, such as servers with unique software, might appear unusual but satisfy a specific business need. + + +*Response and remediation* + + +- Initiate the incident response process based on the outcome of the triage. +- Isolate the involved host to prevent further post-compromise behavior. +- If the triage identified malware, search the environment for additional compromised hosts. + - Implement temporary network rules, procedures, and segmentation to contain the malware. + - Stop suspicious processes. + - Immediately block the identified indicators of compromise (IoCs). + - Inspect the affected systems for additional malware backdoors, such as reverse shells, reverse proxies, or droppers, that attackers could use to reinfect the system. +- Remove and block malicious artifacts identified during triage. +- Investigate credential exposure on systems compromised or used by the attacker to ensure all compromised accounts are identified. Reset passwords for these accounts and other potentially compromised credentials, such as email, business systems, and web services. +- Run a full antimalware scan. This may reveal additional artifacts left in the system, persistence mechanisms, and malware components. +- Determine the initial vector abused by the attacker and take action to prevent reinfection through the same vector. +- Leverage the incident response data and logging to improve the mean time to detect (MTTD) and the mean time to respond (MTTR). + + +==== Setup + + + +*Setup* + + +This rule requires data coming in from Elastic Defend. + + +*Elastic Defend Integration Setup* + +Elastic Defend is integrated into the Elastic Agent using Fleet. Upon configuration, the integration allows the Elastic Agent to monitor events on your host and send data to the Elastic Security app. + + +*Prerequisite Requirements:* + +- Fleet is required for Elastic Defend. +- To configure Fleet Server refer to the https://www.elastic.co/guide/en/fleet/current/fleet-server.html[documentation]. + + +*The following steps should be executed in order to add the Elastic Defend integration on a Linux System:* + +- Go to the Kibana home page and click "Add integrations". +- In the query bar, search for "Elastic Defend" and select the integration to see more details about it. +- Click "Add Elastic Defend". +- Configure the integration name and optionally add a description. +- Select the type of environment you want to protect, either "Traditional Endpoints" or "Cloud Workloads". +- Select a configuration preset. Each preset comes with different default settings for Elastic Agent, you can further customize these later by configuring the Elastic Defend integration policy. https://www.elastic.co/guide/en/security/current/configure-endpoint-integration-policy.html[Helper guide]. +- We suggest selecting "Complete EDR (Endpoint Detection and Response)" as a configuration setting, that provides "All events; all preventions" +- Enter a name for the agent policy in "New agent policy name". If other agent policies already exist, you can click the "Existing hosts" tab and select an existing policy instead. +For more details on Elastic Agent configuration settings, refer to the https://www.elastic.co/guide/en/fleet/8.10/agent-policy.html[helper guide]. +- Click "Save and Continue". +- To complete the integration, select "Add Elastic Agent to your hosts" and continue to the next section to install the Elastic Agent on your hosts. +For more details on Elastic Defend refer to the https://www.elastic.co/guide/en/security/current/install-endpoint.html[helper guide]. + + +==== Rule query + + +[source, js] +---------------------------------- +process where host.os.type == "linux" and event.type == "start" and event.action in ("exec", "exec_event") and ( + ( + // gost & pivotnacci - spawned without process.parent.name + (process.name == "gost" and process.args : ("-L*", "-C*", "-R*")) or (process.name == "pivotnacci")) or ( + // ssh + (process.name in ("ssh", "sshd") and (process.args in ("-R", "-L", "-D", "-w") and process.args_count >= 4 and + not process.args : "chmod")) or + // sshuttle + (process.name == "sshuttle" and process.args in ("-r", "--remote", "-l", "--listen") and process.args_count >= 4) or + // socat + (process.name == "socat" and process.args : ("TCP4-LISTEN:*", "SOCKS*") and process.args_count >= 3) or + // chisel + (process.name : "chisel*" and process.args in ("client", "server")) or + // iodine(d), dnscat, hans, ptunnel-ng, ssf, 3proxy & ngrok + (process.name in ("iodine", "iodined", "dnscat", "hans", "hans-ubuntu", "ptunnel-ng", "ssf", "3proxy", "ngrok")) + ) and process.parent.name in ("bash", "dash", "ash", "sh", "tcsh", "csh", "zsh", "ksh", "fish") +) + +---------------------------------- + +*Framework*: MITRE ATT&CK^TM^ + +* Tactic: +** Name: Command and Control +** ID: TA0011 +** Reference URL: https://attack.mitre.org/tactics/TA0011/ +* Technique: +** Name: Protocol Tunneling +** ID: T1572 +** Reference URL: https://attack.mitre.org/techniques/T1572/ diff --git a/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rule-8-10-17-potential-privilege-escalation-via-cve-2022-38028.asciidoc b/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rule-8-10-17-potential-privilege-escalation-via-cve-2022-38028.asciidoc new file mode 100644 index 0000000000..60a90dae78 --- /dev/null +++ b/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rule-8-10-17-potential-privilege-escalation-via-cve-2022-38028.asciidoc @@ -0,0 +1,76 @@ +[[prebuilt-rule-8-10-17-potential-privilege-escalation-via-cve-2022-38028]] +=== Potential privilege escalation via CVE-2022-38028 + +Identifies a privilege escalation attempt via exploiting CVE-2022-38028 to hijack the print spooler service execution. + +*Rule type*: eql + +*Rule indices*: + +* logs-endpoint.events.file-* +* logs-windows.sysmon_operational-* +* endgame-* + +*Severity*: high + +*Risk score*: 73 + +*Runs every*: 5m + +*Searches indices from*: now-9m ({ref}/common-options.html#date-math[Date Math format], see also <>) + +*Maximum alerts per execution*: 100 + +*References*: + +* https://www.microsoft.com/en-us/security/blog/2024/04/22/analyzing-forest-blizzards-custom-post-compromise-tool-for-exploiting-cve-2022-38028-to-obtain-credentials/ + +*Tags*: + +* Domain: Endpoint +* OS: Windows +* Use Case: Threat Detection +* Tactic: Privilege Escalation +* Tactic: Defense Evasion +* Data Source: Elastic Endgame +* Data Source: Elastic Defend +* Data Source: Sysmon + +*Version*: 1 + +*Rule authors*: + +* Elastic + +*Rule license*: Elastic License v2 + + +==== Rule query + + +[source, js] +---------------------------------- +file where host.os.type == "windows" and + file.path : ("?:\\*\\Windows\\system32\\DriVerStoRe\\FiLeRePoSiToRy\\*\\MPDW-constraints.js", + "?:\\*\\Windows\\WinSxS\\amd64_microsoft-windows-printing-printtopdf_*\\MPDW-constraints.js") + +---------------------------------- + +*Framework*: MITRE ATT&CK^TM^ + +* Tactic: +** Name: Privilege Escalation +** ID: TA0004 +** Reference URL: https://attack.mitre.org/tactics/TA0004/ +* Technique: +** Name: Exploitation for Privilege Escalation +** ID: T1068 +** Reference URL: https://attack.mitre.org/techniques/T1068/ +* Tactic: +** Name: Defense Evasion +** ID: TA0005 +** Reference URL: https://attack.mitre.org/tactics/TA0005/ +* Technique: +** Name: Masquerading +** ID: T1036 +** Reference URL: https://attack.mitre.org/techniques/T1036/ diff --git a/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rule-8-10-17-shell-configuration-modification.asciidoc b/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rule-8-10-17-shell-configuration-modification.asciidoc new file mode 100644 index 0000000000..a725fcdd22 --- /dev/null +++ b/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rule-8-10-17-shell-configuration-modification.asciidoc @@ -0,0 +1,121 @@ +[[prebuilt-rule-8-10-17-shell-configuration-modification]] +=== Shell Configuration Modification + +This rule monitors the creation/alteration of a shell configuration by a previously unknown process executable using the new terms rule type. Unix systems use shell configuration files to set environment variables, create aliases, and customize the user's environment. Adversaries may modify or add a shell configuration file to execute malicious code and gain persistence in the system. This behavior is consistent with the Kaiji malware family. + +*Rule type*: new_terms + +*Rule indices*: + +* logs-endpoint.events.* +* endgame-* + +*Severity*: medium + +*Risk score*: 47 + +*Runs every*: 5m + +*Searches indices from*: now-9m ({ref}/common-options.html#date-math[Date Math format], see also <>) + +*Maximum alerts per execution*: 100 + +*References*: + +* https://intezer.com/blog/research/kaiji-new-chinese-linux-malware-turning-to-golang/ + +*Tags*: + +* Domain: Endpoint +* OS: Linux +* Use Case: Threat Detection +* Tactic: Persistence +* Data Source: Elastic Endgame +* Data Source: Elastic Defend + +*Version*: 1 + +*Rule authors*: + +* Elastic + +*Rule license*: Elastic License v2 + + +==== Setup + + + +*Setup* + + +This rule requires data coming in from Elastic Defend. + + +*Elastic Defend Integration Setup* + +Elastic Defend is integrated into the Elastic Agent using Fleet. Upon configuration, the integration allows the Elastic Agent to monitor events on your host and send data to the Elastic Security app. + + +*Prerequisite Requirements:* + +- Fleet is required for Elastic Defend. +- To configure Fleet Server refer to the https://www.elastic.co/guide/en/fleet/current/fleet-server.html[documentation]. + + +*The following steps should be executed in order to add the Elastic Defend integration on a Linux System:* + +- Go to the Kibana home page and click "Add integrations". +- In the query bar, search for "Elastic Defend" and select the integration to see more details about it. +- Click "Add Elastic Defend". +- Configure the integration name and optionally add a description. +- Select the type of environment you want to protect, either "Traditional Endpoints" or "Cloud Workloads". +- Select a configuration preset. Each preset comes with different default settings for Elastic Agent, you can further customize these later by configuring the Elastic Defend integration policy. https://www.elastic.co/guide/en/security/current/configure-endpoint-integration-policy.html[Helper guide]. +- We suggest selecting "Complete EDR (Endpoint Detection and Response)" as a configuration setting, that provides "All events; all preventions" +- Enter a name for the agent policy in "New agent policy name". If other agent policies already exist, you can click the "Existing hosts" tab and select an existing policy instead. +For more details on Elastic Agent configuration settings, refer to the https://www.elastic.co/guide/en/fleet/8.10/agent-policy.html[helper guide]. +- Click "Save and Continue". +- To complete the integration, select "Add Elastic Agent to your hosts" and continue to the next section to install the Elastic Agent on your hosts. +For more details on Elastic Defend refer to the https://www.elastic.co/guide/en/security/current/install-endpoint.html[helper guide]. + + +==== Rule query + + +[source, js] +---------------------------------- +event.category:file and host.os.type:linux and +event.action:(creation or file_create_event or rename or file_rename_event) and file.path:( + "/etc/profile" or "/etc/profile.local" or "/etc/bashrc" or "/etc/bash.bashrc" or "/etc/bash.bashrc.local" or + "/etc/zshenv" or "/etc/zprofile" or "/etc/zlogin" or "/etc/zlogout" or "/root/.profile" or "/root/.bash_logout" or + "/root/.bashrc" or "/root/.bash_login" or /etc/profile.d/* or /home/*/.profile or /home/*/.bash_logout or + /home/*/.bashrc or /home/*/.bash_login +) and not ( + (process.executable: ( + "/bin/dpkg" or "/usr/bin/dpkg" or "/bin/useradd" or "/usr/sbin/useradd" or "/bin/adduser" or "/usr/sbin/adduser" or + "/bin/dockerd" or "/usr/bin/dockerd" or "/bin/microdnf" or "/usr/bin/microdnf" or "/bin/rpm" or "/usr/bin/rpm" or + "/bin/snapd" or "/usr/bin/snapd" or "/bin/yum" or "/usr/bin/yum" or "/bin/dnf" or "/usr/bin/dnf" or "/bin/podman" or + "/usr/bin/podman" or "/bin/dnf-automatic" or "/usr/bin/dnf-automatic" or "/bin/pacman" or "/usr/bin/pacman" + ) +) or + (file.extension:("swp" or "swpx")) or + (process.executable:("/bin/sed" or "/usr/bin/sed") and file.name:sed*) or + (process.executable:("/bin/perl" or "/usr/bin/perl") and file.name:e2scrub_all.tmp*) +) + +---------------------------------- + +*Framework*: MITRE ATT&CK^TM^ + +* Tactic: +** Name: Persistence +** ID: TA0003 +** Reference URL: https://attack.mitre.org/tactics/TA0003/ +* Technique: +** Name: Event Triggered Execution +** ID: T1546 +** Reference URL: https://attack.mitre.org/techniques/T1546/ +* Sub-technique: +** Name: Unix Shell Configuration Modification +** ID: T1546.004 +** Reference URL: https://attack.mitre.org/techniques/T1546/004/ diff --git a/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rules-8-10-17-appendix.asciidoc b/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rules-8-10-17-appendix.asciidoc new file mode 100644 index 0000000000..085f55ff73 --- /dev/null +++ b/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rules-8-10-17-appendix.asciidoc @@ -0,0 +1,10 @@ +["appendix",role="exclude",id="prebuilt-rule-8-10-17-prebuilt-rules-8-10-17-appendix"] += Downloadable rule update v8.10.17 + +This section lists all updates associated with version 8.10.17 of the Fleet integration *Prebuilt Security Detection Rules*. + + +include::prebuilt-rule-8-10-17-shell-configuration-modification.asciidoc[] +include::prebuilt-rule-8-10-17-potential-privilege-escalation-via-cve-2022-38028.asciidoc[] +include::prebuilt-rule-8-10-17-network-activity-detected-via-kworker.asciidoc[] +include::prebuilt-rule-8-10-17-potential-linux-tunneling-and-or-port-forwarding.asciidoc[] diff --git a/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rules-8-10-17-summary.asciidoc b/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rules-8-10-17-summary.asciidoc new file mode 100644 index 0000000000..87f57ca7d5 --- /dev/null +++ b/docs/detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rules-8-10-17-summary.asciidoc @@ -0,0 +1,20 @@ +[[prebuilt-rule-8-10-17-prebuilt-rules-8-10-17-summary]] +[role="xpack"] +== Update v8.10.17 + +This section lists all updates associated with version 8.10.17 of the Fleet integration *Prebuilt Security Detection Rules*. + + +[width="100%",options="header"] +|============================================== +|Rule |Description |Status |Version + +|<> | This rule monitors the creation/alteration of a shell configuration by a previously unknown process executable using the new terms rule type. Unix systems use shell configuration files to set environment variables, create aliases, and customize the user's environment. Adversaries may modify or add a shell configuration file to execute malicious code and gain persistence in the system. This behavior is consistent with the Kaiji malware family. | new | 1 + +|<> | Identifies a privilege escalation attempt via exploiting CVE-2022-38028 to hijack the print spooler service execution. | new | 1 + +|<> | This rule monitors for network connections from a kworker process. kworker, or kernel worker, processes are part of the kernel's workqueue mechanism. They are responsible for executing work that has been scheduled to be done in kernel space, which might include tasks like handling interrupts, background activities, and other kernel-related tasks. Attackers may attempt to evade detection by masquerading as a kernel worker process. | update | 4 + +|<> | This rule monitors for a set of Linux utilities that can be used for tunneling and port forwarding. Attackers can leverage tunneling and port forwarding techniques to bypass network defenses, establish hidden communication channels, and gain unauthorized access to internal resources, facilitating data exfiltration, lateral movement, and remote control. | update | 7 + +|============================================== diff --git a/docs/detections/prebuilt-rules/prebuilt-rules-downloadable-updates.asciidoc b/docs/detections/prebuilt-rules/prebuilt-rules-downloadable-updates.asciidoc index 7c77ccad9e..7d8febdbf4 100644 --- a/docs/detections/prebuilt-rules/prebuilt-rules-downloadable-updates.asciidoc +++ b/docs/detections/prebuilt-rules/prebuilt-rules-downloadable-updates.asciidoc @@ -13,6 +13,13 @@ For previous rule updates, please navigate to the https://www.elastic.co/guide/e |Update version |Date | New rules | Updated rules | Notes +|<> | 30 Apr 2024 | 2 | 2 | +This release includes new rules for Linux and Windows and tuned rules for Linux. +New rules for Linux include detection for persistence. +New rules for Windows include detection for privilege escalation. +Additionally, significant rule tuning for Linux rules has been added for better rule efficacy and performance. + + |<> | 23 Apr 2024 | 11 | 110 | This release includes new rules and tuned rules for Windows. New rules for Windows include detection for potential windows session hijacking via CcmExec. @@ -135,3 +142,4 @@ include::downloadable-packages/8-10-13/prebuilt-rules-8-10-13-summary.asciidoc[l include::downloadable-packages/8-10-14/prebuilt-rules-8-10-14-summary.asciidoc[leveloffset=+1] include::downloadable-packages/8-10-15/prebuilt-rules-8-10-15-summary.asciidoc[leveloffset=+1] include::downloadable-packages/8-10-16/prebuilt-rules-8-10-16-summary.asciidoc[leveloffset=+1] +include::downloadable-packages/8-10-17/prebuilt-rules-8-10-17-summary.asciidoc[leveloffset=+1] diff --git a/docs/detections/prebuilt-rules/prebuilt-rules-reference.asciidoc b/docs/detections/prebuilt-rules/prebuilt-rules-reference.asciidoc index 5d10bce29a..bf29472519 100644 --- a/docs/detections/prebuilt-rules/prebuilt-rules-reference.asciidoc +++ b/docs/detections/prebuilt-rules/prebuilt-rules-reference.asciidoc @@ -998,7 +998,7 @@ and their rule type is `machine_learning`. |<> |Identifies the addition of a Netsh Helper DLL, netsh.exe supports the addition of these DLLs to extend its functionality. Attackers may abuse this mechanism to execute malicious payloads every time the utility is executed, which can be done by administrators or a scheduled task. |[Domain: Endpoint], [OS: Windows], [Use Case: Threat Detection], [Tactic: Persistence], [Data Source: Elastic Endgame], [Data Source: Elastic Defend] |8.3.0 |2 -|<> |This rule monitors for network connections from a kworker process. kworker, or kernel worker, processes are part of the kernel's workqueue mechanism. They are responsible for executing work that has been scheduled to be done in kernel space, which might include tasks like handling interrupts, background activities, and other kernel-related tasks. Attackers may attempt to evade detection by masquerading as a kernel worker process. |[Domain: Endpoint], [OS: Linux], [Use Case: Threat Detection], [Tactic: Command and Control], [Data Source: Elastic Defend] |8.6.0 |3 +|<> |This rule monitors for network connections from a kworker process. kworker, or kernel worker, processes are part of the kernel's workqueue mechanism. They are responsible for executing work that has been scheduled to be done in kernel space, which might include tasks like handling interrupts, background activities, and other kernel-related tasks. Attackers may attempt to evade detection by masquerading as a kernel worker process. |[Domain: Endpoint], [OS: Linux], [Use Case: Threat Detection], [Tactic: Command and Control], [Data Source: Elastic Defend] |8.6.0 |4 |<> |This rule monitors for the execution of the cat command, followed by a connection attempt by the same process. Cat is capable of transfering data via tcp/udp channels by redirecting its read output to a /dev/tcp or /dev/udp channel. This activity is highly suspicious, and should be investigated. Attackers may leverage this capability to transfer tools or files to another host in the network or exfiltrate data while attempting to evade detection in the process. |[Domain: Endpoint], [OS: Linux], [Use Case: Threat Detection], [Tactic: Command and Control], [Data Source: Elastic Defend] |8.3.0 |6 @@ -1228,7 +1228,7 @@ and their rule type is `machine_learning`. |<> |This rule monitors for X11 forwarding via SSH. X11 forwarding is a feature that allows users to run graphical applications on a remote server and display the application's graphical user interface on their local machine. Attackers can abuse X11 forwarding for tunneling their GUI-based tools, pivot through compromised systems, and create covert communication channels, enabling lateral movement and facilitating remote control of systems within a network. |[Domain: Endpoint], [OS: Linux], [Use Case: Threat Detection], [Tactic: Command and Control], [Data Source: Elastic Defend], [Data Source: Elastic Endgame], [Rule Type: BBR] |8.3.0 |3 -|<> |This rule monitors for a set of Linux utilities that can be used for tunneling and port forwarding. Attackers can leverage tunneling and port forwarding techniques to bypass network defenses, establish hidden communication channels, and gain unauthorized access to internal resources, facilitating data exfiltration, lateral movement, and remote control. |[Domain: Endpoint], [OS: Linux], [Use Case: Threat Detection], [Tactic: Command and Control], [Data Source: Elastic Defend], [Data Source: Elastic Endgame] |8.3.0 |6 +|<> |This rule monitors for a set of Linux utilities that can be used for tunneling and port forwarding. Attackers can leverage tunneling and port forwarding techniques to bypass network defenses, establish hidden communication channels, and gain unauthorized access to internal resources, facilitating data exfiltration, lateral movement, and remote control. |[Domain: Endpoint], [OS: Linux], [Use Case: Threat Detection], [Tactic: Command and Control], [Data Source: Elastic Defend], [Data Source: Elastic Endgame] |8.3.0 |7 |<> |Identifies attempt to coerce a local NTLM authentication via HTTP using the Windows Printer Spooler service as a target. An adversary may use this primitive in combination with other techniques to elevate privileges on a compromised system. |[Domain: Endpoint], [OS: Windows], [Use Case: Threat Detection], [Tactic: Credential Access], [Tactic: Defense Evasion], [Data Source: Elastic Endgame], [Data Source: Elastic Defend] |8.3.0 |109 @@ -1406,6 +1406,8 @@ and their rule type is `machine_learning`. |<> |Identifies a high number (20) of macOS SSH KeyGen process executions from the same host. An adversary may attempt a brute force attack to obtain unauthorized access to user accounts. |[Domain: Endpoint], [OS: macOS], [Use Case: Threat Detection], [Tactic: Credential Access], [Data Source: Elastic Defend] |8.3.0 |108 +|<> |Identifies a privilege escalation attempt via exploiting CVE-2022-38028 to hijack the print spooler service execution. |[Domain: Endpoint], [OS: Windows], [Use Case: Threat Detection], [Tactic: Privilege Escalation], [Tactic: Defense Evasion], [Data Source: Elastic Endgame], [Data Source: Elastic Defend], [Data Source: Sysmon] |8.3.0 |1 + |<> |Detects when an attacker abuses the Multi-Factor authentication mechanism by repeatedly issuing login requests until the user eventually accepts the Okta push notification. An adversary may attempt to bypass the Okta MFA policies configured for an organization to obtain unauthorized access. |[Use Case: Identity and Access Audit], [Tactic: Credential Access], [Data Source: Okta] |8.10.0 |209 |<> |This rule monitors for the execution of suspicious commands via screen and tmux. When launching a command and detaching directly, the commands will be executed in the background via its parent process. Attackers may leverage screen or tmux to execute commands while attempting to evade detection. |[Domain: Endpoint], [OS: Linux], [Use Case: Threat Detection], [Tactic: Defense Evasion], [Data Source: Elastic Defend], [Data Source: Elastic Endgame] |8.3.0 |4 @@ -1632,6 +1634,8 @@ and their rule type is `machine_learning`. |<> |This rule monitors the creation of shared object files by previously unknown processes. The creation of a shared object file involves compiling code into a dynamically linked library that can be loaded by other programs at runtime. While this process is typically used for legitimate purposes, malicious actors can leverage shared object files to execute unauthorized code, inject malicious functionality into legitimate processes, or bypass security controls. This allows malware to persist on the system, evade detection, and potentially compromise the integrity and confidentiality of the affected system and its data. |[Domain: Endpoint], [OS: Linux], [Use Case: Threat Detection], [Tactic: Persistence], [Data Source: Elastic Endgame], [Data Source: Elastic Defend] |8.6.0 |7 +|<> |This rule monitors the creation/alteration of a shell configuration by a previously unknown process executable using the new terms rule type. Unix systems use shell configuration files to set environment variables, create aliases, and customize the user's environment. Adversaries may modify or add a shell configuration file to execute malicious code and gain persistence in the system. This behavior is consistent with the Kaiji malware family. |[Domain: Endpoint], [OS: Linux], [Use Case: Threat Detection], [Tactic: Persistence], [Data Source: Elastic Endgame], [Data Source: Elastic Defend] |8.6.0 |1 + |<> |Identifies the execution of the shell process (sh) via scripting (JXA or AppleScript). Adversaries may use the doShellScript functionality in JXA or do shell script in AppleScript to execute system commands. |[Domain: Endpoint], [OS: macOS], [Use Case: Threat Detection], [Tactic: Execution], [Data Source: Elastic Defend] |8.3.0 |106 |<> |Identifies shortcut files written to or modified in the startup folder. Adversaries may use this technique to maintain persistence. |[Domain: Endpoint], [OS: Windows], [Use Case: Threat Detection], [Tactic: Persistence], [Data Source: Elastic Defend], [Rule Type: BBR] |8.3.0 |2 diff --git a/docs/detections/prebuilt-rules/rule-desc-index.asciidoc b/docs/detections/prebuilt-rules/rule-desc-index.asciidoc index 00f69ee859..305011be89 100644 --- a/docs/detections/prebuilt-rules/rule-desc-index.asciidoc +++ b/docs/detections/prebuilt-rules/rule-desc-index.asciidoc @@ -694,6 +694,7 @@ include::rule-details/potential-windows-error-manager-masquerading.asciidoc[] include::rule-details/potential-windows-session-hijacking-via-ccmexec.asciidoc[] include::rule-details/potential-curl-cve-2023-38545-exploitation.asciidoc[] include::rule-details/potential-macos-ssh-brute-force-detected.asciidoc[] +include::rule-details/potential-privilege-escalation-via-cve-2022-38028.asciidoc[] include::rule-details/potentially-successful-mfa-bombing-via-push-notifications.asciidoc[] include::rule-details/potentially-suspicious-process-started-via-tmux-or-screen.asciidoc[] include::rule-details/powershell-invoke-ninjacopy-script.asciidoc[] @@ -807,6 +808,7 @@ include::rule-details/setcap-setuid-setgid-capability-set.asciidoc[] include::rule-details/setuid-setgid-bit-set-via-chmod.asciidoc[] include::rule-details/sharepoint-malware-file-upload.asciidoc[] include::rule-details/shared-object-created-or-changed-by-previously-unknown-process.asciidoc[] +include::rule-details/shell-configuration-modification.asciidoc[] include::rule-details/shell-execution-via-apple-scripting.asciidoc[] include::rule-details/shortcut-file-written-or-modified-on-startup-folder.asciidoc[] include::rule-details/signed-proxy-execution-via-ms-work-folders.asciidoc[] diff --git a/docs/detections/prebuilt-rules/rule-details/network-activity-detected-via-kworker.asciidoc b/docs/detections/prebuilt-rules/rule-details/network-activity-detected-via-kworker.asciidoc index 549366855d..cf1b872f28 100644 --- a/docs/detections/prebuilt-rules/rule-details/network-activity-detected-via-kworker.asciidoc +++ b/docs/detections/prebuilt-rules/rule-details/network-activity-detected-via-kworker.asciidoc @@ -15,7 +15,7 @@ This rule monitors for network connections from a kworker process. kworker, or k *Runs every*: 5m -*Searches indices from*: now-60m ({ref}/common-options.html#date-math[Date Math format], see also <>) +*Searches indices from*: now-9m ({ref}/common-options.html#date-math[Date Math format], see also <>) *Maximum alerts per execution*: 100 @@ -29,7 +29,7 @@ This rule monitors for network connections from a kworker process. kworker, or k * Tactic: Command and Control * Data Source: Elastic Defend -*Version*: 3 +*Version*: 4 *Rule authors*: @@ -92,7 +92,7 @@ process.name:kworker* and not destination.ip:( "::1" or "FE80::/10" or "FF00::/8" -) +) and not destination.port:2049 ---------------------------------- diff --git a/docs/detections/prebuilt-rules/rule-details/potential-linux-tunneling-and-or-port-forwarding.asciidoc b/docs/detections/prebuilt-rules/rule-details/potential-linux-tunneling-and-or-port-forwarding.asciidoc index 92c78598dc..fe8f95594a 100644 --- a/docs/detections/prebuilt-rules/rule-details/potential-linux-tunneling-and-or-port-forwarding.asciidoc +++ b/docs/detections/prebuilt-rules/rule-details/potential-linux-tunneling-and-or-port-forwarding.asciidoc @@ -34,7 +34,7 @@ This rule monitors for a set of Linux utilities that can be used for tunneling a * Data Source: Elastic Defend * Data Source: Elastic Endgame -*Version*: 6 +*Version*: 7 *Rule authors*: @@ -169,7 +169,7 @@ process where host.os.type == "linux" and event.type == "start" and event.action // gost & pivotnacci - spawned without process.parent.name (process.name == "gost" and process.args : ("-L*", "-C*", "-R*")) or (process.name == "pivotnacci")) or ( // ssh - (process.name in ("ssh", "sshd") and (process.args in ("-R", "-L", "D", "-w") and process.args_count >= 4 and + (process.name in ("ssh", "sshd") and (process.args in ("-R", "-L", "-D", "-w") and process.args_count >= 4 and not process.args : "chmod")) or // sshuttle (process.name == "sshuttle" and process.args in ("-r", "--remote", "-l", "--listen") and process.args_count >= 4) or diff --git a/docs/detections/prebuilt-rules/rule-details/potential-privilege-escalation-via-cve-2022-38028.asciidoc b/docs/detections/prebuilt-rules/rule-details/potential-privilege-escalation-via-cve-2022-38028.asciidoc new file mode 100644 index 0000000000..30e243ae91 --- /dev/null +++ b/docs/detections/prebuilt-rules/rule-details/potential-privilege-escalation-via-cve-2022-38028.asciidoc @@ -0,0 +1,76 @@ +[[potential-privilege-escalation-via-cve-2022-38028]] +=== Potential privilege escalation via CVE-2022-38028 + +Identifies a privilege escalation attempt via exploiting CVE-2022-38028 to hijack the print spooler service execution. + +*Rule type*: eql + +*Rule indices*: + +* logs-endpoint.events.file-* +* logs-windows.sysmon_operational-* +* endgame-* + +*Severity*: high + +*Risk score*: 73 + +*Runs every*: 5m + +*Searches indices from*: now-9m ({ref}/common-options.html#date-math[Date Math format], see also <>) + +*Maximum alerts per execution*: 100 + +*References*: + +* https://www.microsoft.com/en-us/security/blog/2024/04/22/analyzing-forest-blizzards-custom-post-compromise-tool-for-exploiting-cve-2022-38028-to-obtain-credentials/ + +*Tags*: + +* Domain: Endpoint +* OS: Windows +* Use Case: Threat Detection +* Tactic: Privilege Escalation +* Tactic: Defense Evasion +* Data Source: Elastic Endgame +* Data Source: Elastic Defend +* Data Source: Sysmon + +*Version*: 1 + +*Rule authors*: + +* Elastic + +*Rule license*: Elastic License v2 + + +==== Rule query + + +[source, js] +---------------------------------- +file where host.os.type == "windows" and + file.path : ("?:\\*\\Windows\\system32\\DriVerStoRe\\FiLeRePoSiToRy\\*\\MPDW-constraints.js", + "?:\\*\\Windows\\WinSxS\\amd64_microsoft-windows-printing-printtopdf_*\\MPDW-constraints.js") + +---------------------------------- + +*Framework*: MITRE ATT&CK^TM^ + +* Tactic: +** Name: Privilege Escalation +** ID: TA0004 +** Reference URL: https://attack.mitre.org/tactics/TA0004/ +* Technique: +** Name: Exploitation for Privilege Escalation +** ID: T1068 +** Reference URL: https://attack.mitre.org/techniques/T1068/ +* Tactic: +** Name: Defense Evasion +** ID: TA0005 +** Reference URL: https://attack.mitre.org/tactics/TA0005/ +* Technique: +** Name: Masquerading +** ID: T1036 +** Reference URL: https://attack.mitre.org/techniques/T1036/ diff --git a/docs/detections/prebuilt-rules/rule-details/shell-configuration-modification.asciidoc b/docs/detections/prebuilt-rules/rule-details/shell-configuration-modification.asciidoc new file mode 100644 index 0000000000..7dac5801e7 --- /dev/null +++ b/docs/detections/prebuilt-rules/rule-details/shell-configuration-modification.asciidoc @@ -0,0 +1,121 @@ +[[shell-configuration-modification]] +=== Shell Configuration Modification + +This rule monitors the creation/alteration of a shell configuration by a previously unknown process executable using the new terms rule type. Unix systems use shell configuration files to set environment variables, create aliases, and customize the user's environment. Adversaries may modify or add a shell configuration file to execute malicious code and gain persistence in the system. This behavior is consistent with the Kaiji malware family. + +*Rule type*: new_terms + +*Rule indices*: + +* logs-endpoint.events.* +* endgame-* + +*Severity*: medium + +*Risk score*: 47 + +*Runs every*: 5m + +*Searches indices from*: now-9m ({ref}/common-options.html#date-math[Date Math format], see also <>) + +*Maximum alerts per execution*: 100 + +*References*: + +* https://intezer.com/blog/research/kaiji-new-chinese-linux-malware-turning-to-golang/ + +*Tags*: + +* Domain: Endpoint +* OS: Linux +* Use Case: Threat Detection +* Tactic: Persistence +* Data Source: Elastic Endgame +* Data Source: Elastic Defend + +*Version*: 1 + +*Rule authors*: + +* Elastic + +*Rule license*: Elastic License v2 + + +==== Setup + + + +*Setup* + + +This rule requires data coming in from Elastic Defend. + + +*Elastic Defend Integration Setup* + +Elastic Defend is integrated into the Elastic Agent using Fleet. Upon configuration, the integration allows the Elastic Agent to monitor events on your host and send data to the Elastic Security app. + + +*Prerequisite Requirements:* + +- Fleet is required for Elastic Defend. +- To configure Fleet Server refer to the https://www.elastic.co/guide/en/fleet/current/fleet-server.html[documentation]. + + +*The following steps should be executed in order to add the Elastic Defend integration on a Linux System:* + +- Go to the Kibana home page and click "Add integrations". +- In the query bar, search for "Elastic Defend" and select the integration to see more details about it. +- Click "Add Elastic Defend". +- Configure the integration name and optionally add a description. +- Select the type of environment you want to protect, either "Traditional Endpoints" or "Cloud Workloads". +- Select a configuration preset. Each preset comes with different default settings for Elastic Agent, you can further customize these later by configuring the Elastic Defend integration policy. https://www.elastic.co/guide/en/security/current/configure-endpoint-integration-policy.html[Helper guide]. +- We suggest selecting "Complete EDR (Endpoint Detection and Response)" as a configuration setting, that provides "All events; all preventions" +- Enter a name for the agent policy in "New agent policy name". If other agent policies already exist, you can click the "Existing hosts" tab and select an existing policy instead. +For more details on Elastic Agent configuration settings, refer to the https://www.elastic.co/guide/en/fleet/8.10/agent-policy.html[helper guide]. +- Click "Save and Continue". +- To complete the integration, select "Add Elastic Agent to your hosts" and continue to the next section to install the Elastic Agent on your hosts. +For more details on Elastic Defend refer to the https://www.elastic.co/guide/en/security/current/install-endpoint.html[helper guide]. + + +==== Rule query + + +[source, js] +---------------------------------- +event.category:file and host.os.type:linux and +event.action:(creation or file_create_event or rename or file_rename_event) and file.path:( + "/etc/profile" or "/etc/profile.local" or "/etc/bashrc" or "/etc/bash.bashrc" or "/etc/bash.bashrc.local" or + "/etc/zshenv" or "/etc/zprofile" or "/etc/zlogin" or "/etc/zlogout" or "/root/.profile" or "/root/.bash_logout" or + "/root/.bashrc" or "/root/.bash_login" or /etc/profile.d/* or /home/*/.profile or /home/*/.bash_logout or + /home/*/.bashrc or /home/*/.bash_login +) and not ( + (process.executable: ( + "/bin/dpkg" or "/usr/bin/dpkg" or "/bin/useradd" or "/usr/sbin/useradd" or "/bin/adduser" or "/usr/sbin/adduser" or + "/bin/dockerd" or "/usr/bin/dockerd" or "/bin/microdnf" or "/usr/bin/microdnf" or "/bin/rpm" or "/usr/bin/rpm" or + "/bin/snapd" or "/usr/bin/snapd" or "/bin/yum" or "/usr/bin/yum" or "/bin/dnf" or "/usr/bin/dnf" or "/bin/podman" or + "/usr/bin/podman" or "/bin/dnf-automatic" or "/usr/bin/dnf-automatic" or "/bin/pacman" or "/usr/bin/pacman" + ) +) or + (file.extension:("swp" or "swpx")) or + (process.executable:("/bin/sed" or "/usr/bin/sed") and file.name:sed*) or + (process.executable:("/bin/perl" or "/usr/bin/perl") and file.name:e2scrub_all.tmp*) +) + +---------------------------------- + +*Framework*: MITRE ATT&CK^TM^ + +* Tactic: +** Name: Persistence +** ID: TA0003 +** Reference URL: https://attack.mitre.org/tactics/TA0003/ +* Technique: +** Name: Event Triggered Execution +** ID: T1546 +** Reference URL: https://attack.mitre.org/techniques/T1546/ +* Sub-technique: +** Name: Unix Shell Configuration Modification +** ID: T1546.004 +** Reference URL: https://attack.mitre.org/techniques/T1546/004/ diff --git a/docs/index.asciidoc b/docs/index.asciidoc index 297bfed2b1..73c91ef990 100644 --- a/docs/index.asciidoc +++ b/docs/index.asciidoc @@ -115,3 +115,5 @@ include::detections/prebuilt-rules/downloadable-packages/8-10-14/prebuilt-rules- include::detections/prebuilt-rules/downloadable-packages/8-10-15/prebuilt-rules-8-10-15-appendix.asciidoc[] include::detections/prebuilt-rules/downloadable-packages/8-10-16/prebuilt-rules-8-10-16-appendix.asciidoc[] + +include::detections/prebuilt-rules/downloadable-packages/8-10-17/prebuilt-rules-8-10-17-appendix.asciidoc[]