Impossible travel event leads to permission enumeration

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aws

Classification:

attack

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Goal

Correlate an impossible travel login with permission enumeration of a user.

Strategy

Correlate the User travel was impossible in AWS CloudTrail IAM log and A user received multiple AccessDenied errors signals based on the ARN: {{@userIdentity.arn}}.

Triage and response

Set signal triage state to Under Review.
Determine if the impossible travel login was is legitimate.
- If the login was not legitimate:
  - Investigate the user using the User Investigation Dashboard
  - Rotate credentials on the account
  - Enable MFA if it is not already enabled
- If the login was legitimate:
  - Triage the signal as a false positive