Attempts to Brute Force a Microsoft 365 User Accountedit
Identifies attempts to brute force a Microsoft 365 user account. An adversary may attempt a brute force attack to obtain unauthorized access to user accounts.
Rule type: threshold
Rule indices:
- filebeat-*
- logs-o365*
Severity: high
Risk score: 73
Runs every: 5 minutes
Searches indices from: now-30m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
Tags:
- Elastic
- Cloud
- Microsoft 365
- Continuous Monitoring
- SecOps
- Identity and Access
Version: 3 (version history)
Added (Elastic Stack release): 7.11.0
Last modified (Elastic Stack release): 7.13.0
Rule authors: Elastic
Rule license: Elastic License v2
Potential false positivesedit
Automated processes that attempt to authenticate using expired credentials and unbounded retries may lead to false positives.
Investigation guideedit
Config
The Microsoft 365 Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.
Rule queryedit
event.dataset:o365.audit and event.provider:AzureActiveDirectory and event.category:authentication and event.action:UserLoginFailed and event.outcome:failure
Threat mappingedit
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
-
Technique:
- Name: Brute Force
- ID: T1110
- Reference URL: https://attack.mitre.org/techniques/T1110/
Rule version historyedit
- Version 3 (7.13.0 release)
-
- Formatting only
- Version 2 (7.12.0 release)
-
- Formatting only