LoFP / it is possible that an aws administrator has legitimately disabled versioning on certain buckets to avoid costs.

Techniques

• T1490

Sample rules

AWS Disable Bucket Versioning

• source: splunk
• technicques:
  • T1490

Description

The following analytic detects when AWS S3 bucket versioning is suspended by a user. It leverages AWS CloudTrail logs to identify PutBucketVersioning events with the VersioningConfiguration.Status set to Suspended. This activity is significant because disabling versioning can prevent recovery of deleted or modified data, which is a common tactic in ransomware attacks. If confirmed malicious, this action could lead to data loss and hinder recovery efforts, severely impacting data integrity and availability.

Detection logic

`cloudtrail` eventName= PutBucketVersioning "requestParameters.VersioningConfiguration.Status"=Suspended 
|  stats count values(requestParameters.bucketName) as bucket_name values(resources{}.ARN) as resource_arn by src_ip aws_account_id awsRegion eventName userAgent user_arn userIdentity.principalId  errorCode 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)`
| `aws_disable_bucket_versioning_filter`