LoFP / a malware filter rule may be deleted 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 Malware Filter Rule Modification

• source: elastic
• technicques:
  • T1562

Description

Identifies when a malware filter rule has been deleted or disabled in Microsoft 365. An adversary or insider threat may want to modify a malware filter rule to evade detection.

Detection logic

event.dataset:o365.audit and event.provider:Exchange and event.category:web and event.action:("Remove-MalwareFilterRule" or "Disable-MalwareFilterRule") and event.outcome:success