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    Anomalous Email Rule Creation By Compromised Account

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    GlassDiceBearhttps://www.dicebear.comhttps://creativecommons.org/publicdomain/zero/1.0/„Glass” (https://www.dicebear.com) by „DiceBear”, licensed under „CC0 1.0” (https://creativecommons.org/publicdomain/zero/1.0/)
    Tim Peck@timpeck
    •updated Dec 23, 2025•9•1•200

    Detects suspicious email inbox rule creation indicative of account compromise. Focuses on rules with randomly-generated names or rules that move emails to low-visibility folders combined with hiding actions (mark as read, delete, stop processing).

    YARA-L

    Tags

    T1137 - Office Application StartupT1114.003 - Email Forwarding RuleT1557 - Adversary-in-the-MiddleTA0005 - Defense EvasionTA0009 - CollectionTA0003 - PersistenceTA0006 - Credential AccessEmail SentAdmin ActivityOffice 365Saas ApplicationM365 Unified Audit LogGoogle Workspace Admin Logs

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