Impossible Travel — Sigma Rule

Rule metadata and linked tags

Author: Mark Morowczynski '@markmorow', Gloria Lee, '@gleeiamglo'. Source status: test; severity: high. Source dates: 2023-09-03 / not supplied.

{
  "product": "azure",
  "service": "riskdetection"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 6eb5f351e1d9e3dfdfe5b49742cecf33a29a668d247ca8e3ebc3de0382bd3070

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Impossible Travel
id: b2572bf9-e20a-4594-b528-40bde666525a
status: test
description: Identifies user activities originating from geographically distant locations within a time period shorter than the time it takes to travel from the first location to the second.
references:
    - https://learn.microsoft.com/en-us/entra/id-protection/concept-identity-protection-risks#impossible-travel
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#unusual-sign-ins
author: Mark Morowczynski '@markmorow', Gloria Lee, '@gleeiamglo'
date: 2023-09-03
tags:
    - attack.stealth
    - attack.t1078
    - attack.persistence
    - attack.privilege-escalation
    - attack.initial-access
logsource:
    product: azure
    service: riskdetection
detection:
    selection:
        riskEventType: 'impossibleTravel'
    condition: selection
falsepositives:
    - Connecting to a VPN, performing activity and then dropping and performing additional activity.
level: high

Original YAML and metadata in JSON

False positives

• Connecting to a VPN, performing activity and then dropping and performing additional activity.

Source references

• https://learn.microsoft.com/en-us/entra/id-protection/concept-identity-protection-risks#impossible-travel
• https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#unusual-sign-ins