What it does. Detect LSASS credential dumping, SAM database extraction, and NTDS.dit theft (e.g. via Mimikatz) using Sysmon Event ID 10 process-access logging, Windows Security logs, and SIEM correlation rules. Use when hunting for credential-theft activity on Windows/Active Directory hosts or triaging EDR alerts on LSASS access. Part of mukul975/Anthropic-Cybersecurity-Skills (817 security skills) (mukul975/Anthropic-Cybersecurity-Skills).

Install

• npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-credential-dumping-techniques, or copy the skill folder into ~/.claude/skills/detecting-credential-dumping-techniques/.
• Raw file: curl -sL https://raw.githubusercontent.com/mukul975/Anthropic-Cybersecurity-Skills/HEAD/skills/detecting-credential-dumping-techniques/SKILL.md

SKILL.md (verbatim)

name: detecting-credential-dumping-techniques
description: Detect LSASS credential dumping, SAM database extraction, and NTDS.dit theft (e.g. via Mimikatz) using Sysmon Event ID 10 process-access logging, Windows Security logs, and SIEM correlation rules. Use when hunting for credential-theft activity on Windows/Active Directory hosts or triaging EDR alerts on LSASS access.
domain: cybersecurity
subdomain: threat-detection
tags:
- credential-dumping
- lsass
- mimikatz
- sysmon
- active-directory
- windows-security
- defense-evasion
version: '1.0'
author: mahipal
license: Apache-2.0
d3fend_techniques:
- Token Binding
- Execution Isolation
- File Metadata Consistency Validation
- Restore Access
- Application Protocol Command Analysis
nist_csf:
- DE.CM-01
- DE.AE-02
- DE.AE-06
- ID.RA-05
mitre_attack:
- T1078
- T1190
- T1059
- T1003
- T1110
mitre_f3:
  version: '1.1'
  tactics:
  - reconnaissance
  - positioning
  - initial-access
  techniques:
  - id: T1555
    name: Credentials from Password Stores
    tactic: reconnaissance
    source: attack
  - id: T1555.003
    name: 'Credentials from Password Stores: Credentials from Web Browsers'
    tactic: reconnaissance
    source: attack
  - id: T1539
    name: Steal Web Session Cookie
    tactic: positioning
    source: attack
  - id: F1006.002
    name: 'Account Takeover: Exposed Login Credential'
    tactic: initial-access
    source: f3
  - id: T1110.002
    name: 'Brute Force: Password Cracking'
    tactic: initial-access
    source: attack

Detecting Credential Dumping Techniques

Overview

Credential dumping (MITRE ATT&CK T1003) is a post-exploitation technique where adversaries extract authentication credentials from OS memory, registry hives, or domain controller databases. This skill covers detection of LSASS memory access via Sysmon Event ID 10 (ProcessAccess), SAM registry hive export via reg.exe, NTDS.dit extraction via ntdsutil/vssadmin, and comsvcs.dll MiniDump abuse. Detection rules analyze GrantedAccess bitmasks, suspicious calling processes, and known tool signatures.

When to Use

• When investigating security incidents that require detecting credential dumping techniques
• 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

• Sysmon v14+ deployed with ProcessAccess logging (Event ID 10) for lsass.exe
• Windows Security audit policy enabling process creation (Event ID 4688) with command line logging
• Splunk or Elastic SIEM ingesting Sysmon and Windows Security logs
• Python 3.8+ for log analysis

Steps

1. Configure Sysmon to log ProcessAccess events targeting lsass.exe
2. Forward Sysmon Event ID 10 and Windows Event ID 4688 to SIEM
3. Create detection rules for known GrantedAccess patterns (0x1010, 0x1FFFFF)
4. Detect comsvcs.dll MiniDump and procdump.exe targeting LSASS PID
5. Alert on reg.exe SAM/SECURITY/SYSTEM hive export commands
6. Detect ntdsutil/vssadmin shadow copy creation for NTDS.dit theft
7. Correlate detections with user/host context for risk scoring

Expected Output

JSON report containing detected credential dumping indicators with technique classification, severity ratings, process details, MITRE ATT&CK mapping, and Splunk/Elastic detection queries.

Other files in this skill

• LICENSE
• SKILL.es.md
• references/api-reference.md
• scripts/agent.py

SKILL.es.md (verbatim)

name: detecting-credential-dumping-techniques description: Detect LSASS credential dumping, SAM database extraction, and NTDS.dit theft using Sysmon Event ID 10, Windows Security logs, and SIEM correlation rules domain: cybersecurity subdomain: threat-detection tags:

• credential-dumping
• lsass
• mimikatz
• sysmon
• active-directory
• windows-security
• defense-evasion version: "1.0" author: mahipal license: Apache-2.0 language: es

Detección de Técnicas de Volcado de Credenciales

Descripción General

El volcado de credenciales (MITRE ATT&CK T1003) es una técnica de post-explotación donde los adversarios extraen credenciales de autenticación de la memoria del sistema operativo, hives del registro o bases de datos del controlador de dominio. Esta habilidad cubre la detección de acceso a la memoria de LSASS mediante Sysmon Event ID 10 (ProcessAccess), la exportación del hive del registro SAM mediante reg.exe, la extracción de NTDS.dit mediante ntdsutil/vssadmin, y el abuso de MiniDump con comsvcs.dll. Las reglas de detección analizan bitmasks de GrantedAccess, procesos invocantes sospechosos y firmas de herramientas conocidas.

Requisitos Previos

• Sysmon v14+ desplegado con registro de ProcessAccess (Event ID 10) para lsass.exe
• Política de auditoría de seguridad de Windows habilitando la creación de procesos (Event ID 4688) con registro de línea de comandos
• SIEM Splunk o Elastic ingiriendo registros de Sysmon y de seguridad de Windows
• Python 3.8+ para análisis de registros

Pasos

1. Configurar Sysmon para registrar eventos ProcessAccess dirigidos a lsass.exe
2. Reenviar Sysmon Event ID 10 y Windows Event ID 4688 al SIEM
3. Crear reglas de detección para patrones de GrantedAccess conocidos (0x1010, 0x1FFFFF)
4. Detectar MiniDump con comsvcs.dll y procdump.exe apuntando al PID de LSASS
5. Alertar sobre comandos de exportación de hives SAM/SECURITY/SYSTEM mediante reg.exe
6. Detectar creación de shadow copy con ntdsutil/vssadmin para robo de NTDS.dit
7. Correlacionar detecciones con contexto de usuario/host para puntuación de riesgo

Salida Esperada

Informe JSON que contiene indicadores detectados de volcado de credenciales con clasificación de técnica, calificaciones de severidad, detalles del proceso, mapeo a MITRE ATT&CK, y consultas de detección para Splunk/Elastic.

references/api-reference.md (verbatim)

Credential Dumping Detection API Reference

Sysmon Event ID 10 - ProcessAccess

Key Fields

SourceImage       - Process accessing LSASS
SourceProcessId   - PID of accessing process
TargetImage       - Should be C:\Windows\System32\lsass.exe
GrantedAccess     - Access rights bitmask
CallTrace         - DLL call stack of the access

Suspicious GrantedAccess Values

Sysmon Event ID 1 - Process Creation

Command Line Patterns for Credential Theft

# SAM hive export
reg save hklm\sam C:\temp\sam.hiv
reg save hklm\security C:\temp\security.hiv
reg save hklm\system C:\temp\system.hiv

# comsvcs.dll LSASS dump
rundll32.exe C:\Windows\System32\comsvcs.dll, MiniDump <lsass_pid> dump.bin full

# NTDS.dit extraction
ntdsutil "activate instance ntds" ifm "create full C:\temp"
vssadmin create shadow /for=C:

Splunk SPL Queries

LSASS Access Detection

index=sysmon EventCode=10 TargetImage="*\\lsass.exe"
  GrantedAccess IN ("0x1010","0x1FFFFF","0x1410","0x1438")
  SourceImage!="*\\csrss.exe" SourceImage!="*\\svchost.exe"
| stats count by SourceImage, GrantedAccess, Computer, User
| sort -count

comsvcs.dll MiniDump Detection

index=sysmon EventCode=1
  (CommandLine="*comsvcs*MiniDump*" OR CommandLine="*comsvcs*#24*")
| table _time, Computer, User, ParentImage, CommandLine

SAM/SECURITY Hive Export

index=sysmon EventCode=1 Image="*\\reg.exe"
  (CommandLine="*save*hklm\\sam*" OR CommandLine="*save*hklm\\security*")
| table _time, Computer, User, CommandLine

Elastic / KQL Queries

LSASS Access in Elastic

event.code: "10" AND
  winlog.event_data.TargetImage: *lsass.exe AND
  winlog.event_data.GrantedAccess: ("0x1010" OR "0x1FFFFF")

Process Creation with Credential Theft Commands

event.code: "1" AND
  (process.command_line: *comsvcs*MiniDump* OR
   process.command_line: *reg*save*hklm\\sam*)

MITRE ATT&CK Mapping

CLI Usage

# Analyze Sysmon XML export
python agent.py --sysmon-xml sysmon_events.xml --output cred_report.json

# Print Splunk detection queries
python agent.py --show-splunk

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