Suspicious AWS Lambda Function Code Update via CloudTrail (via aws)
- Product
- aws
- Service
- cloudtrail
- Author
- HuntRule
- Published
- 2026-10-28
- Updated
- 2026-10-28
ATT&CK techniques
ExecutionRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects updates to AWS Lambda function code recorded in CloudTrail. In the observed intrusion the attacker replaced the code of an EC2 initialization Lambda to gain execution inside the environment. Unexpected function code updates outside of a deployment pipeline can indicate tampering for execution or persistence.
Reporting behind it
Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.
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