LoFP / a safe attachment rule may be disabled by a system or network administrator. verify that the configuration change was expected. exceptions can be added to this rule to filter expected behavior.

Techniques

• T1562

Sample rules

Microsoft 365 Exchange Safe Attachment Rule Disabled

• source: elastic
• technicques:
  • T1562

Description

Identifies when a safe attachment rule is disabled in Microsoft 365. Safe attachment rules can extend malware protections to include routing all messages and attachments without a known malware signature to a special hypervisor environment. An adversary or insider threat may disable a safe attachment rule to exfiltrate data or evade defenses.

Detection logic

event.dataset:o365.audit and event.provider:Exchange and event.category:web and event.action:"Disable-SafeAttachmentRule" and event.outcome:success