Goal

Detect when unusual authentication attempts from different geo locations are made from a single user.

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 {{@ocsf.user.name}} traveled more than 500km at over 1,000km/h. This detection rule aims to identify potential threats early, allowing for timely investigation and mitigation to protect server resources and maintain service availability. This rule specifically compares logins across sources, alerting on impossible travel scenarios across multiple applications.

Triage and response

1. Investigate the source user {{@ocsf.user.name}} with a request from different geo location 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}}.
2. Implement immediate measures to block or limit the impact of the suspicious activity if confirmed as a threat.
3. Use the Cloud SIEM - User Investigation dashboard to audit any user actions that may have occurred after the illegitimate login.