Splunk unknown stable spl
AWS Defense Evasion PutBucketLifecycle
The following analytic detects `PutBucketLifecycle` events in AWS CloudTrail logs where a user sets a lifecycle rule for an S3 bucket with an expiration period of fewer than three days. This detection leverages CloudTrail logs to identify suspicious lifecycle configurations. This activity is significant because attackers may use it to delete CloudTrail logs quickly, thereby evading detection and impairing forensic investigations. If confirmed malicious, this could allow attackers to cover their tracks, making it difficult to trace their actions and respond to the breach effectively.
Detection Logic
`cloudtrail` eventName=PutBucketLifecycle user_type=IAMUser errorCode=success
| spath path=requestParameters{}.LifecycleConfiguration{}.Rule{}.Expiration{}.Days output=expiration_days
| spath path=requestParameters{}.bucketName output=bucket_name
| rename user_name as user
| 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
expiration_days
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `aws_defense_evasion_putbucketlifecycle_filter`False Positives
- ⚠ While this search has no known false positives, it is possible that it is a legitimate admin activity. Please consider filtering out these noisy events using userAgent, user_arn field names.
Field Validations
Loading…
Comments (0)
Loading comments...