{
  "doc_id": "KB-O365-INBOX-RULE-ABUSE",
  "doc_type": "kb",
  "title": "Inbox Rule Abuse After Account Compromise",
  "scenario": "o365_suspicious_login",
  "summary": "Common mailbox persistence behaviors after O365 account compromise, especially rule creation to hide or forward finance emails.",
  "applicability": ["azuread_suspicious_inbox_rule_after_login"],
  "key_points": ["Attackers often hide financial emails using move-to-folder rules.", "Forwarding and delete rules are strong post-compromise indicators.", "Mailbox audit logs should be reviewed immediately after suspicious login confirmation."],
  "investigation_guidance": ["Enumerate all inbox rules and forwarding settings.", "Check mailbox audit timeline around suspicious sign-in.", "Review OAuth consents if inbox rules are absent but suspicious mail actions continue."],
  "decision_points": ["Inbox rule creation shortly after suspicious login strongly supports compromise verdict."],
  "related_entities": {"ttps": ["T1114"], "iocs": []},
  "related_refs": {"playbooks": ["PB-O365-LOGIN-001"], "cases": []},
  "tags": ["kb", "o365", "inbox-rule"],
  "updated_at": "2026-04-10T09:40:00+08:00"
}