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DETECTION OVERVIEW

NTLMv1 Authentication

Risk Factors

NTLMv1 is a challenge-response authentication protocol for authenticating Windows systems when Kerberos is unavailable. A skilled attacker can easily intercept NTLM hashes and crack passwords offline. A successful exploit of NTLMv1 authentication can also enable an attacker to launch machine-in-the-middle (MITM) attacks or take complete control of a domain.

Category

Hardening
Next in Hardening: Plaintext Credentials Received over HTTP

Background

Mitigation Options

Restrict or disable NTLMv1 authentication and enable Kerberos for authentication

MITRE ATT&CK ID

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