Sync from PR#2291

Create open_redirect_youtube_google.yml by @zoomequipd
#2291
Source SHA e18e747
Triggered by @zoomequipd

detection-rules/open_redirect_youtube_google.yml

@@ -0,0 +1,26 @@
+name: "Open Redirect: YouTube --> Google Redirection Chain"
+description: |
+  Message contains use of a redirect chain which involves YouTube and Google amp. This has been exploited in the wild.
+type: "rule"
+severity: "medium"
+source: |
+  type.inbound
+  and any(body.links,
+          (
+            .href_url.domain.root_domain == "youtube.com"
+            and strings.icontains(.href_url.path, 'logout')
+            // the redirect field
+            and strings.icontains(.href_url.query_params, "continue=")
+            and regex.icontains(.href_url.query_params, '&continue=(?:https?)?(?:(?:%3a|\:)?(?:\/|%2f){2})?google\.com[^\&]*\/+amp\/+s\/+')
+          )
+  )
+attack_types:
+  - "Credential Phishing"
+tactics_and_techniques:
+  - "Open redirect"
+detection_methods:
+  - "Sender analysis"
+  - "URL analysis"
+id: "67823fac-cb03-5aea-a8ff-782e2e8c42d4"
+testing_pr: 2291
+testing_sha: e18e747ec8ead2ac7dde90bf0a77dafb6edb3177