Elastic Security Detection Rules

Microsoft 365 Potential ransomware activity

Last updated 6 months ago on 2025-01-15
Created 4 years ago on 2021-07-15

About

Identifies when Microsoft Cloud App Security reports that a user has uploaded files to the cloud that might be infected with ransomware.
Tags
Domain: CloudData Source: Microsoft 365Use Case: Configuration AuditTactic: ImpactLanguage: kuery
Severity
medium
Risk Score
47
MITRE ATT&CK™

Impact (TA0040)(opens in a new tab or window)

↳ Data Encrypted for Impact (T1486)(opens in a new tab or window)

False Positive Examples
If Cloud App Security identifies, for example, a high rate of file uploads or file deletion activities it may represent an adverse encryption process.
License
Elastic License v2(opens in a new tab or window)

Definition

Rule Type
Query (Kibana Query Language)
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
filebeat-*logs-o365*
Related Integrations

o365(opens in a new tab or window)

Query
event.dataset:o365.audit and event.provider:SecurityComplianceCenter and event.category:web and event.action:"Potential ransomware activity" and event.outcome:success

Install detection rules in Elastic Security

Detect Microsoft 365 Potential ransomware activity in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).