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 |
Informational |
Description
Multiple user accounts authenticated to a host via NTLMv1 or LM authentication for the first time in the past 30 days. This may be a result of an NTLM downgrade attack
A downgrade attack may force the client to authenticate with a weaker hash/protocol (such as NTLMv1 or even LM) instead of NTLMv2.
Attacker's Goals
The attacker attempts to gain access to the accounts.
Investigative actions
- Audit all login events with a weaker protocol and review any anomalous usage.
- Investigate the mentioned host for additional suspicious activity.