Individual skill
pentesting-netbios
Testing NetBIOS over TCP/IP services during authorized engagements. Covers the NetBIOS Name Service (137/udp, 137/tcp), Datagram Service (138/udp), and Session Service (139/tcp). Focuses on name and MAC enumeration with nmblookup, nbtscan and nmap nbstat, identifying workgroups/domains, and pivoting to SMB over NetBIOS (139) for share and user enumeration.
internal/tools/skills/data/network-services-pentesting/pentesting-netbios/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
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Repository context
- Repository stars (not skill ratings)
- 1,324
- Repository last updated
- Nov 9, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- penetration-testing Declared skill tag
- network-services Declared skill tag
- netbios Declared skill tag
- smb Declared skill tag
- windows Declared skill tag
- enumeration Declared skill tag
- testing Derived category
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# Pentesting NetBIOS (ports 137/138/139)
## When to Use
- During authorized internal network assessments when UDP 137, UDP 138, or TCP 139 is reachable
- When mapping Windows hosts on a LAN by NetBIOS name, workgroup/domain, and MAC address
- When TCP 445 is filtered but 139 is open (SMB over NetBIOS still works)
- As an early reconnaissance step before SMB/Active Directory enumeration
- When investigating NBT-NS/LLMNR poisoning opportunities for credential capture
## Quick Enumeration
```bash
# Names the server uses + MAC address (Name Service, 137)