Google Workspace user edited account recovery information

gsuite

Classification:

attack

Tactic:

TA0003-persistence

Set up the gsuite integration.

Goal

Detect when a Google Workspace user edits account recovery information.

Strategy

Monitor Google Workspace logs to detect when a user edits account recovery information. An attacker who has already gained initial access may update the user’s recovery information to maintain access to the account.

Notes:

  • This rule triggers with a Low severity when this activity originates from an anonymizing proxy.
  • This rule triggers with a High severity when this activity originates from a Tor client.

Triage and response

  1. Check for other signals and logs generated by the impacted user {{@usr.email}}, and look for deviations in the following properties:
    • Application
    • Device
    • Geolocation
    • IP address
  2. Reach out to the user {{@usr.email}} to confirm if they recognize the activity.
  3. If the activity is not legitimate, block the user from signing in and begin your Incident Response process.

Changelog

  • 17 August 2023 - Updated query to replace attribute @threat_intel.results.subcategory:tor with @threat_intel.results.category:tor.