AWS S3 bucket data retention policy change through S3 Lifecycle rule

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	5 Days
Required Data	AWS Audit Log
Detection Modules	Cloud
Detector Tags	Cloud Log Tampering Analytics
ATT&CK Tactic	Defense Impairment (TA0112)
ATT&CK Technique	Disable or Modify Tools: Disable or Modify Cloud Log (T1685.002)
Severity	Informational

Description

A retention policy was set on a S3 bucket used by a CloudTrail Trail, using a S3 Lifecycle Rule.

Attacker's Goals

Evade detection by automatically deleting audit logs.

Investigative actions

• Review the new S3 bucket lifecycle policy.
• Check The cloud identity activity prior/after to the lifecycle policy modification.