Responder (also known as Responder, SpiderLabs Responder) is a security tool / technique active since 2014. LLMNR/NBT-NS/mDNS poisoner. Key characteristics include: LLMNR poisoning, NBT-NS poisoning, NTLMv2 hash capture, SMB relay attacks, pentesting standard.
Overview & Background
LLMNR/NBT-NS/mDNS poisoner. First identified in 2014, this threat is attributed to Laurent Gaffie (open source).
Responder remains an active threat. Organizations should implement detection rules and monitor for indicators associated with this security tool / technique.
- Category: Security Tool / Technique
- Active since: 2014
- Attribution: Laurent Gaffie (open source)
- Also known as: Responder, SpiderLabs Responder
Technical Analysis
Responder employs the following capabilities and techniques:
- Llmnr Poisoning: Core functionality
- Nbt-Ns Poisoning: Core functionality
- Ntlmv2 Hash Capture: Core functionality
- Smb Relay Attacks: Core functionality
- Pentesting Standard: Core functionality
MITRE ATT&CK Mapping
| Tactic | Technique | Usage |
|---|---|---|
| Initial Access | T1566.001 Phishing Attachment | Common delivery vector |
| Execution | T1204.002 Malicious File | User-triggered execution |
| Persistence | T1547.001 Registry Run Keys | Autostart persistence |
| Defense Evasion | T1027 Obfuscated Files | Payload obfuscation |
| C2 | T1071.001 Web Protocols | HTTP/HTTPS C2 |
Detection & Defense
- Endpoint detection: Deploy behavioral detection rules for Responder indicators
- Network monitoring: Monitor for C2 traffic patterns and anomalous connections
- Threat intelligence: Track Responder IOCs and campaign updates
- Security awareness: Train users to recognize phishing and social engineering
- Patch management: Keep systems updated to prevent exploitation
Defend Against Responder
Mjolnir Security provides detection and response capabilities against Responder and similar threats.
- Proactive Threat Hunting Hunt for Responder indicators and TTPs within your environment.
- Threat Intelligence Monitor Responder campaigns and infrastructure changes.
- 24/7 Incident Response Rapid containment and forensic investigation. Call +1 833 403 5875.
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