Rules: Hexadecimal in DNS Query Domain
Encoding in hexadecimal is a way that attackers can bypass network security devices that are inspecting traffic. While hexadecimal often appears in subdomains, it much less frequent in domains.
| Detail | Value |
|---|---|
| Type | Match |
| Category | Exfiltration |
| Apply Risk to Entities | srcDevice_ip, user_username, device_hostname, device_ip |
| Signal Name | Hexadecimal in DNS Query Domain |
| Summary Expression | Hexadecimal encoding detected in DNS query domain: {{dns_queryDomain_rootDomain}} |
| Score/Severity | Static: 4 |
| Enabled by Default | True |
| Prototype | False |
| Tags | _mitreAttackTactic:TA0010, _mitreAttackTactic:TA0011, _mitreAttackTechnique:T1132, _mitreAttackTechnique:T1132.001 |
- Amazon AWS - Application Load Balancer
- Amazon AWS - Route53
- Bro - Bro
- Cisco Systems - Umbrella
- Cloudflare - Logpush
- CrowdStrike - FDR
- Fortinet - Fortigate
- Google - Google Cloud Platform
- Infoblox - Network Identity Operating System
- Microsoft - DNS
- Microsoft - Windows
- Netskope - Security Cloud
- Sophos - UTM 9
- Zscaler - Firewall
- Zscaler - Nanolog Streaming Service
| Origin | Field |
|---|---|
| Normalized Schema | device_hostname |
| Normalized Schema | device_ip |
| Normalized Schema | dns_queryDomain_alexaRank |
| Normalized Schema | dns_queryDomain_rootDomain |
| Normalized Schema | dns_queryType |
| Normalized Schema | listMatches |
| Normalized Schema | srcDevice_ip |
| Normalized Schema | user_username |