AWS ConsoleLogin with MFA triggered Impossible Travel scenario

cloudtrail

Classification:

attack

Tactic:

TA0001-initial-access

Technique:

T1078-valid-accounts

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Goal

Detect an Impossible Travel event when a @userIdentity.type: {{@userIdentity.type}} performs a consoleLogin with a multi-factor authentication (MFA) device.

Strategy

The Impossible Travel detection type’s algorithm compares the GeoIP data of the last log and the current log to determine if the user with @userIdentity.session_name: {{@userIdentity.session_name}} traveled more than 500km at over 1,000km/h and the user used MFA.

Triage and response

  1. Determine if {{@userIdentity.session_name}} should be connecting from {{@impossible_travel.triggering_locations.first_location.city}}, {{@impossible_travel.triggering_locations.first_location.country}} and {{@impossible_travel.triggering_locations.second_location.city}}, {{@impossible_travel.triggering_locations.second_location.country}} in a short period of time.
  2. If the user should not be connecting from {{@impossible_travel.triggering_locations.first_location.city}}, {{@impossible_travel.triggering_locations.first_location.country}} and {{@impossible_travel.triggering_locations.second_location.city}}, {{@impossible_travel.triggering_locations.second_location.country}}, then consider isolating the account and reset credentials.
  3. Use the Cloud SIEM - User Investigation dashboard to audit any user actions that may have occurred after the illegitimate login.

Changelog

  • 10 March 2022 - Updated rule.
  • 15 December 2022 - Updated rule to cover edge case.