AWS GuardDuty threat intel set deleted

Classification:

attack

Tactic:

TA0005-defense-evasion

Technique:

T1562-impair-defenses

Goal

Detect when an attacker is trying to evade defenses by deleting a GuardDuty ThreatIntelSet.

Strategy

This rule lets you monitor this CloudTrail API call to detect if an attacker is deleting a GuardDuty ThreatIntelSet:

• DeleteThreatIntelSet

Triage and response

1. Determine if user: {{@userIdentity.arn}} should have made a {{@evt.name}} API call.
2. If the API call was not made by the user:

• Rotate user credentials.
• Determine what other API calls were made by the user.
• Replace ThreatIntelSets deleted by the user with the aws-cli command create-threat-intel-set or use the AWS Console.

3. If the API call was made by the user:

• Determine if the user should be performing this API call and if it was an authorized change.
• If No, see if other API calls were made by the user and determine if they warrant further investigation.