Microsoft 365 Potential ransomware activity

edit

Microsoft 365 Potential ransomware activity

edit

Identifies when Microsoft Cloud App Security reports that a user has uploaded 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 (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Domain: Cloud
Data Source: Microsoft 365
Use Case: Configuration Audit
Tactic: Impact

Version: 206

Rule authors:

Austin Songer

Rule license: Elastic License v2

Investigation guide

edit

Setup

edit

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:SecurityComplianceCenter and event.category:web and event.action:"Potential ransomware activity" and event.outcome:success

Framework: MITRE ATT&CK^TM

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/

« Microsoft 365 Portal Logins from Impossible Travel Locations Microsoft 365 Teams Custom Application Interaction Allowed »