Techniques
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
| rename user_name as user, requestParameters.bucketName as bucket_name
| stats count min(_time) as firstTime max(_time) as lastTime by signature dest user user_agent src vendor_account vendor_region vendor_product bucket_name
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `aws_disable_bucket_versioning_filter`
ASL 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
`amazon_security_lake` api.operation=PutBucketVersioning
| spath input=api.request.data path=VersioningConfiguration.Status output=Status
| spath input=api.request.data path=bucketName output=bucketName
| search Status=Suspended
| fillnull
| stats count min(_time) as firstTime max(_time) as lastTime by actor.user.uid api.operation api.service.name http_request.user_agent src_endpoint.ip actor.user.account.uid cloud.provider cloud.region api.request.data bucketName
| rename actor.user.uid as user api.operation as action api.service.name as dest http_request.user_agent as user_agent src_endpoint.ip as src actor.user.account.uid as vendor_account cloud.provider as vendor_product cloud.region as vendor_region
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `asl_aws_disable_bucket_versioning_filter`