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mail rules",{"type":230,"value":231,"toc":333},"minimark",[232,236,240,245,258,262,265,268,271,275,284,288],[233,234,228],"h1",{"id":235},"malicious-mail-rules",[237,238,239],"p",{},"ID: SAT1023",[241,242,244],"h2",{"id":243},"tactics","Tactics",[246,247,248,252,255],"ul",{},[249,250,251],"li",{},"Persistence",[249,253,254],{},"Privilege Escalation",[249,256,257],{},"Defense Evasion",[241,259,261],{"id":260},"summary","Summary",[237,263,264],{},"Common SaaS mail providers like Office365 and Gmail provide mail rule functionality that allows users to automate certain tasks on their mailboxes. 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So one obvious tactic is to use them to persist access to a compromised mailbox by setting up auto-forwarding rules for all emails (or ones with interesting keywords, like “password reset” or “invoice”) to an external address - this is typical in BEC-style attacks.",[237,269,270],{},"By intercepting password or MFA reset emails through forwarding and auto-delete rules, mail rules can be used to move laterally to compromise accounts for other SaaS apps, while also avoiding alerting the user to the malicious activity.",[241,272,274],{"id":273},"examples","Examples",[246,276,277],{},[249,278,279],{},[280,281,283],"a",{"href":282},"examples/office_365","Office 365",[241,285,287],{"id":286},"references","References",[246,289,290,298,305,312,319,326],{},[249,291,292],{},[280,293,297],{"href":294,"rel":295},"https://www.netspi.com/blog/technical/adversary-simulation/malicious-outlook-rules/",[296],"nofollow","Malicious Outlook Rules - Technical blog post",[249,299,300],{},[280,301,304],{"href":302,"rel":303},"https://github.com/sensepost/ruler",[296],"Ruler - A tool to abuse Exchange services",[249,306,307],{},[280,308,311],{"href":309,"rel":310},"https://github.com/FSecureLABS/XRulez",[296],"XRulez - A command line tool for creating malicious outlook rules",[249,313,314],{},[280,315,318],{"href":316,"rel":317},"https://attack.mitre.org/techniques/T1114/003/",[296],"MITRE ATT&CK - Email Forwarding Rule",[249,320,321],{},[280,322,325],{"href":323,"rel":324},"https://darktrace.com/blog/breakdown-of-a-multi-account-compromise-within-office-365",[296],"Multi-account Office365 compromise using mail rules",[249,327,328],{},[280,329,332],{"href":330,"rel":331},"https://www.microsoft.com/en-us/security/blog/2023/12/12/threat-actors-misuse-oauth-applications-to-automate-financially-driven-attacks/",[296],"Microsoft blog - Mail rules used to hide attacks",{"title":29,"searchDepth":48,"depth":48,"links":334},[335,336,337,338],{"id":243,"depth":48,"text":244},{"id":260,"depth":48,"text":261},{"id":273,"depth":48,"text":274},{"id":286,"depth":48,"text":287},[340],{"text":283,"url":341},"https://github.com/pushsecurity/browser-identity-attacks-matrix/blob/main/techniques/malicious_mail_rules/examples/office_365.md","md","malicious_mail_rules",{},"/techniques/malicious_mail_rules/description",[347,348,349,350,351,352],{"text":297,"url":294},{"text":304,"url":302},{"text":311,"url":309},{"text":318,"url":316},{"text":325,"url":323},{"text":332,"url":330},{"title":228,"description":239},"techniques/malicious_mail_rules/description","\u003Cp>Common SaaS mail providers like Office365 and Gmail provide mail rule functionality that allows users to automate certain tasks on their mailboxes. 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