Microsoft 365 Potential ransomware activity
Elastic Stack Serverless Security
Identifies when Microsoft Cloud App Security reported when a user uploads files to the cloud that might be infected with ransomware.
Rule type: query
Rule indices:
- filebeat-*
- logs-o365*
Severity: medium
Risk score: 47
Runs every: 5m
Searches indices from: now-30m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)
Maximum alerts per execution: 100
References:
- https://docs.microsoft.com/en-us/cloud-app-security/anomaly-detection-policy
- https://docs.microsoft.com/en-us/cloud-app-security/policy-template-reference
Tags:
- Elastic
- Cloud
- Microsoft 365
- Continuous Monitoring
- SecOps
- Configuration Audit
Version: 1
Rule authors:
- Austin Songer
Rule license: Elastic License v2
The Microsoft 365 Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.
event.dataset:o365.audit and event.provider:SecurityComplianceCenter and event.category:web and event.action:"Potential ransomware activity" and event.outcome:success
Framework: MITRE ATT&CKTM
Tactic:
- Name: Impact
- ID: TA0040
- Reference URL: https://attack.mitre.org/tactics/TA0040/
Technique:
- Name: Data Encrypted for Impact
- ID: T1486
- Reference URL: https://attack.mitre.org/techniques/T1486/