Sync from PR#2159

Create spam_google_group_invite.yml by @zoomequipd #2159 Source SHA f8e971a Triggered by @zoomequipd
sublime-security · Dec 11, 2024 · 5a11f81 · 5a11f81
1 parent c5666d2
commit 5a11f81
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/detection-rules/spam_google_group_invite.yml b/detection-rules/spam_google_group_invite.yml
@@ -2,14 +2,15 @@ name: "Spam: Google Groups Invitations"
 description: "Detects suspicious Google Groups invitations containing inappropriate content or suspicious patterns. The rule looks for invites from non-organizational domains that contain random alphanumeric strings, explicit keywords, or suspicious call-to-action phrases in the group names or descriptions."
 type: "rule"
 severity: "low"
-source: "type.inbound\n// \n//  Warning: This rule contains sexually explict keywords\n// \nand sender.email.email == \"noreply@groups.google.com\"\nand (\n  strings.istarts_with(subject.subject, 'Invitation to join ')\n  or strings.istarts_with(subject.subject, 'You have been added to ')\n)\n// the invite is not from an $org_domain user\nand not any($org_domains,\n            strings.icontains(body.current_thread.text,\n                              strings.concat('@',\n                                             .,\n                                             ' invited you to join the '\n                              )\n            )\n            or strings.icontains(body.current_thread.text,\n                                 strings.concat('@', ., ' added you to the ')\n            )\n)\nand (\n    // the group name contains 7 char sets at the start and end and must contain a number\n    regex.icontains(subject.subject,\n                    '(?:added to|to join) [A-Z0-9]{6,7} .*(?:[[:^ascii:]]|[[:^alpha:]]) [A-Z0-9]{6,7}$'\n    )\n    // calls to action in the group name\n    or regex.icontains(subject.subject,\n                       '(?:added to|to join) .*(join|(?:click|go|tap) here)'\n    )\n    // it contains an emoji in the group name\n    or regex.icontains(subject.subject,\n                       '(?:added to|to join) .*[\\x{1F300}-\\x{1F5FF}\\x{1F600}-\\x{1F64F}\\x{1F680}-\\x{1F6FF}\\x{1F700}-\\x{1F77F}\\x{1F780}-\\x{1F7FF}\\x{1F900}-\\x{1F9FF}\\x{2600}-\\x{26FF}\\x{2700}-\\x{27BF}\\x{2300}-\\x{23FF}]'\n    )\n    or \n    regex.icontains(body.current_thread.text, '(?:about this group|message from).*(?:sex|horny|cock|fuck|ass|pussy|dick|tits|cum).*https?://')\n)\n"
+source: "type.inbound\n// \n//  Warning: This rule contains sexually explict keywords\n// \nand sender.email.email == \"noreply@groups.google.com\"\nand (\n  strings.istarts_with(subject.subject, 'Invitation to join ')\n  or strings.istarts_with(subject.subject, 'You have been added to ')\n  // the group name contains sexually explict keywords\n  or\n    regex.icontains(subject.subject, '(?:Invitation to join|You have been added to) .*(?:sex|horny|cock|fuck|ass|pussy|dick|tits|cum|girlfriend|boyfriend|naked|porn|video|webcam|masturbate|orgasm|breasts|penis|vagina|strip|suck|blowjob|hardcore|xxx|nudes|sexting|cheating|affair|erotic|lust|desire|intimate|explicit|fetish|kinky|seduce)')\n)\n// the invite is not from an $org_domain user\nand not any($org_domains,\n            strings.icontains(body.current_thread.text,\n                              strings.concat('@',\n                                             .,\n                                             ' invited you to join the '\n                              )\n            )\n            or strings.icontains(body.current_thread.text,\n                                 strings.concat('@', ., ' added you to the ')\n            )\n)\nand (\n    // the group name contains 7 char sets at the start and end and must contain a number\n    regex.icontains(subject.subject,\n                    '(?:added to|to join) [A-Z0-9]{6,7} .*(?:[[:^ascii:]]|[[:^alpha:]]) [A-Z0-9]{6,7}$'\n    )\n    // calls to action in the group name\n    or regex.icontains(subject.subject,\n                       '(?:added to|to join) .*(join|(?:click|go|tap) here)'\n    )\n    // it contains an emoji in the group name\n    or regex.icontains(subject.subject,\n                       '(?:added to|to join) .*[\\x{1F300}-\\x{1F5FF}\\x{1F600}-\\x{1F64F}\\x{1F680}-\\x{1F6FF}\\x{1F700}-\\x{1F77F}\\x{1F780}-\\x{1F7FF}\\x{1F900}-\\x{1F9FF}\\x{2600}-\\x{26FF}\\x{2700}-\\x{27BF}\\x{2300}-\\x{23FF}]'\n    )\n    // the description of the group contains sexually explict keywords \n    or \n    regex.icontains(body.current_thread.text, '(?:about this group|message from).*(?:(sex|horny|cock|fuck|ass|pussy|dick|tits|cum|girlfriend|boyfriend|naked|porn|video|webcam|masturbate|orgasm|breasts|penis|vagina|strip|suck|blowjob|hardcore|xxx|nudes|sexting|cheating|affair|erotic|lust|desire|intimate|explicit|fetish|kinky|seduce)).*https?://')\n    // the invitor is an email domain which contains 3 labels\n    or \n    regex.icontains(body.current_thread.text, '\\n[^\\@]+@(?:[a-zA-Z0-9-]{1,255}\\.){2}[a-zA-Z0-9-]{2,255} (?:added you to the|invited you to join the)')\n)\n"
 attack_types:
   - "Spam"
 tactics_and_techniques:
   - "Free email provider"
+  - "Social engineering"
 detection_methods:
   - "Content analysis"
   - "Sender analysis"
 id: "4e0bec29-be9c-526f-ad56-824b4d87f55d"
 testing_pr: 2159
-testing_sha: 88db12fe0e212220660632ddd9078eaafe7d091c
+testing_sha: f8e971a52ee4410b250f42d4f8e91909aaf30196