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Impossible travel event leads to permission enumeration

aws

Classification:

attack

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

  1. Set signal triage state to Under Review.
  2. 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