sigmalowHunting

Measurable Increase Of Successful Authentications

Detects when successful sign-ins increased by 10% or greater.

MITRE ATT&CK

privilege-escalationpersistenceinitial-accessdefense-evasion

Detection Query

selection:
  Status: Success
  Count: <10%
condition: selection

Author

Mark Morowczynski '@markmorow', MikeDuddington, '@dudders1', Tim Shelton

Created

2022-08-11

Data Sources

azuresigninlogs

Platforms

azure

References

https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#monitoring-for-successful-unusual-sign-ins

Tags

attack.privilege-escalationattack.persistenceattack.initial-accessattack.defense-evasionattack.t1078

Raw Content

title: Measurable Increase Of Successful Authentications
id: 67d5f8fc-8325-44e4-8f5f-7c0ac07cb5ae
status: test
description: Detects when successful sign-ins increased by 10% or greater.
references:
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#monitoring-for-successful-unusual-sign-ins
author: Mark Morowczynski '@markmorow', MikeDuddington, '@dudders1', Tim Shelton
date: 2022-08-11
modified: 2022-08-18
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.initial-access
    - attack.defense-evasion
    - attack.t1078
logsource:
    product: azure
    service: signinlogs
detection:
    selection:
        Status: Success
        Count: "<10%"
    condition: selection
falsepositives:
    - Increase of users in the environment
level: low