IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.
« Microsoft 365 Exchange Malware Filter Policy Deletion Microsoft 365 Exchange Safe Attachment Rule Disabled »
Elastic Docs ›Elastic Security Solution [8.5] ›Downloadable rule update v1.0.2

Microsoft 365 Exchange Malware Filter Rule Modification

edit

Microsoft 365 Exchange Malware Filter Rule Modification

edit

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.

Rule type: query

Rule indices:

  • filebeat-*
  • logs-o365*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-30m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Cloud
  • Microsoft 365
  • Continuous Monitoring
  • SecOps
  • Configuration Audit

Version: 5

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guide

edit
## Config

The Office 365 Logs Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.

Rule query

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

Framework: MITRE ATT&CKTM

« Microsoft 365 Exchange Malware Filter Policy Deletion Microsoft 365 Exchange Safe Attachment Rule Disabled »