Microsoft 365 Portal Login from Rare Location

Detects successful Microsoft 365 portal logins from rare locations. Rare locations are defined as locations that are not commonly associated with the user’s account. This behavior may indicate an adversary attempting to access a Microsoft 365 account from an unusual location or behind a VPN.

Rule type: new_terms

Rule indices:

filebeat-*
logs-o365.audit-*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://www.huntress.com/blog/time-travelers-busted-how-to-detect-impossible-travel-

Tags:

Domain: Cloud
Data Source: Microsoft 365
Use Case: Threat Detection
Tactic: Initial Access

Version: 2

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

event.dataset: "o365.audit"
    and event.provider: "AzureActiveDirectory"
    and event.action: "UserLoggedIn"
    and event.outcome: "success"
    and not o365.audit.UserId: "Not Available"
    and o365.audit.Target.Type: ("0" or "2" or "3" or "5" or "6" or "10")

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Initial Access
- ID: TA0001
- Reference URL: https://attack.mitre.org/tactics/TA0001/
Technique:
- Name: Valid Accounts
- ID: T1078
- Reference URL: https://attack.mitre.org/techniques/T1078/
Sub-technique:
- Name: Cloud Accounts
- ID: T1078.004
- Reference URL: https://attack.mitre.org/techniques/T1078/004/

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