Classification:

attack

Tactic:

TA0010-exfiltration

Technique:

T1537-transfer-data-to-cloud-account

VIEW RULE IN DATADOG VIEW SIGNALS

Goal

Detect a user attempting to exfiltrate an Amazon EC2 AMI Snapshot.

Strategy

This rule lets you monitor the ModifyImageAttribute CloudTrail API calls to detect when an Amazon EC2 AMI snapshot is made public or shared with an AWS account.

This rule also inspects:

• @requestParameters.launchPermission.add.items.group array to determine if the string all is contained. This is the indicator which means the RDS snapshot is made public.
• @requestParameters.launchPermission.add.items.userId array to determine if the string * is contained. This is the indicator which means the RDS snapshot was shared with a new or unknown AWS account.

Triage and response

1. Confirm if the user: {{@userIdentity.arn}} intended to make the RDS snaphsot public.
2. If the user did not make the API call:
   • Rotate the credentials.
   • Investigate if the same credentials made other unauthorized API calls.