Synopsis
Activation Period |
14 Days |
Training Period |
30 Days |
Test Period |
1 Hour |
Deduplication Period |
1 Day |
Required Data |
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Detection Modules |
Identity Analytics |
Detector Tags |
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ATT&CK Tactic |
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ATT&CK Technique |
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Severity |
Low |
Description
A high amount of user accounts were locked out from a single source host in a short time period. This may be the result of a brute-force or password spray attack.
Attacker's Goals
An attacker may be attempting to gain unauthorized access to user accounts.
Investigative actions
- Investigate the associated authentication attempts and login failures (e.g. 4740, 4625, 4776 events).
- Check if any programs were cached with old credentials, resulting in account lockouts.
- Find the computer responsible for the lockouts and verify if it exists on the domain.
- Monitor services that may be running with a user's credentials.