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Mahipal
2fb6a9faff
Each rewritten description now states both what the skill does (concrete capability, named tools/artifacts) and an explicit when-to-use trigger, improving agent discovery/activation. Grounded in each skill's own body; changes confined to the `description` field only (bodies and all other frontmatter untouched). Produced by a gated audit->rewrite->recheck loop (548 -> 0 flagged) with a sampled anti-invention check (0 ungrounded). Schema: 817/817 pass. Framework-ID gate: 0 defects.
2.8 KiB
2.8 KiB
name, description, domain, subdomain, tags, version, author, license, d3fend_techniques, nist_csf, mitre_attack
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| hunting-for-ntlm-relay-attacks | Detects NTLM relay attacks (MITRE T1557.001) by analyzing Windows Event ID 4624 logon type 3 with NTLMSSP authentication, flagging IP-to-hostname mismatches, Responder/LLMNR poisoning signatures, SMB signing status, and anomalous cross-domain authentication patterns. Use when investigating credential-relay activity in Active Directory or building detections for NTLM relay and coercion-based attacks. | cybersecurity | threat-hunting |
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1.0 | mahipal | Apache-2.0 |
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Hunting for NTLM Relay Attacks
Overview
NTLM relay attacks intercept and forward NTLM authentication messages to gain unauthorized access to network resources. Attackers use tools like Responder for LLMNR/NBT-NS poisoning and ntlmrelayx for credential relay. This skill detects relay activity by querying Windows Security Event 4624 (successful logon) for type 3 network logons with NTLMSSP authentication, identifying mismatches between WorkstationName and source IpAddress, detecting rapid multi-host authentication from single accounts, and auditing SMB signing configuration across domain hosts.
When to Use
- When investigating security incidents that require hunting for ntlm relay attacks
- When building detection rules or threat hunting queries for this domain
- When SOC analysts need structured procedures for this analysis type
- When validating security monitoring coverage for related attack techniques
Prerequisites
- Python 3.9+ with Windows Event Log access or exported logs
- Windows Security audit logging enabled (Event ID 4624, 4625, 5145)
- Network access for SMB signing status checks
Key Detection Areas
- IP-hostname mismatch — WorkstationName in Event 4624 does not resolve to the source IpAddress
- NTLMSSP authentication — logon events using NTLM instead of Kerberos from domain-joined hosts
- Machine account relay — computer accounts (ending in $) authenticating from unexpected IPs
- Rapid authentication — single account authenticating to multiple hosts within seconds
- Named pipe access — Event 5145 showing access to Spoolss, lsarpc, netlogon, samr pipes
- SMB signing disabled — hosts not enforcing SMB signing, enabling relay attacks
Output
JSON report with suspected relay events, IP-hostname correlation anomalies, SMB signing audit results, and MITRE ATT&CK mapping to T1557.001.