Detection rules › Sigma
Increased Failed Authentications Of Any Type
Detects when sign-ins increased by 10% or greater.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | T1078 Valid Accounts |
| Persistence | T1078 Valid Accounts |
| Privilege Escalation | T1078 Valid Accounts |
| Stealth | T1078 Valid Accounts |
Rule body yaml
title: Increased Failed Authentications Of Any Type
id: e1d02b53-c03c-4948-b11d-4d00cca49d03
status: test
description: Detects when sign-ins increased by 10% or greater.
references:
- https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#monitoring-for-failed-unusual-sign-ins
author: Mark Morowczynski '@markmorow', MikeDuddington, '@dudders1'
date: 2022-08-11
tags:
- attack.privilege-escalation
- attack.persistence
- attack.initial-access
- attack.stealth
- attack.t1078
logsource:
product: azure
service: signinlogs
detection:
selection:
Status: failure
Count: "<10%"
condition: selection
falsepositives:
- Unlikely
level: medium
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
Status: failure
Count: "<10%"
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.