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mukul975
cb8d79e068
- Add validated mitre_attack frontmatter to all 754 skills (286 distinct techniques), verified against MITRE ATT&CK v19.1 via the official mitreattack-python library: 0 revoked, deprecated, or invalid IDs - Curate precise per-skill technique IDs for forensics, malware-analysis, threat-intel, and red-team skills (e.g. DCSync -> T1003.006, Kerberoasting -> T1558.003, Pass-the-Ticket -> T1550.003) - Reconcile v19.1 tactic restructuring: Defense Evasion split into Stealth (TA0005) and Defense Impairment (TA0112); revoked T1562.* family and T1070.001/.002 remapped to active equivalents (T1685.*) - Normalize word-split tags across 35 skills (remove filename-derived stopword tags, add semantic cybersecurity tags) - Add api-reference.md for 3 skills that were missing it - Update README ATT&CK section with accurate v19.1 tactic distribution
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3.3 KiB
name, description, domain, subdomain, tags, version, author, license, d3fend_techniques, nist_csf, mitre_attack
| name | description | domain | subdomain | tags | version | author | license | d3fend_techniques | nist_csf | mitre_attack | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| hunting-for-dcsync-attacks | Detect DCSync attacks by analyzing Windows Event ID 4662 for unauthorized DS-Replication-Get-Changes requests from non-domain-controller accounts. | cybersecurity | threat-hunting |
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1.0 | mahipal | Apache-2.0 |
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Hunting for DCSync Attacks
When to Use
- When hunting for DCSync credential theft (MITRE ATT&CK T1003.006)
- After detecting Mimikatz or similar tools in the environment
- During incident response involving Active Directory compromise
- When monitoring for unauthorized domain replication requests
- During purple team exercises testing AD attack detection
Prerequisites
- Windows Security Event Log forwarding enabled (Event ID 4662)
- Audit Directory Service Access enabled via Group Policy
- Domain Computers SACL configured on Domain Object for machine account detection
- SIEM with Windows event data ingested (Splunk, Elastic, Sentinel)
- Knowledge of legitimate domain controller accounts and replication partners
Workflow
- Enable Auditing: Ensure Audit Directory Service Access is enabled on domain controllers.
- Collect Events: Gather Windows Event ID 4662 with AccessMask 0x100 (Control Access).
- Filter Replication GUIDs: Search for DS-Replication-Get-Changes and DS-Replication-Get-Changes-All.
- Identify Non-DC Sources: Flag events where SubjectUserName is not a domain controller machine account.
- Correlate with Network: Cross-reference source IPs against known DC addresses.
- Validate Findings: Exclude legitimate replication tools (Azure AD Connect, SCCM).
- Respond: Disable compromised accounts, reset krbtgt, investigate lateral movement.
Key Concepts
| Concept | Description |
|---|---|
| DCSync | Technique abusing AD replication protocol to extract password hashes |
| Event ID 4662 | Directory Service Access audit event |
| DS-Replication-Get-Changes | GUID 1131f6aa-9c07-11d1-f79f-00c04fc2dcd2 |
| DS-Replication-Get-Changes-All | GUID 1131f6ad-9c07-11d1-f79f-00c04fc2dcd2 |
| AccessMask 0x100 | Control Access right indicating extended rights verification |
| T1003.006 | OS Credential Dumping: DCSync |
Tools & Systems
| Tool | Purpose |
|---|---|
| Windows Event Viewer | Direct event log analysis |
| Splunk | SIEM correlation of Event 4662 |
| Elastic Security | Detection rules for DCSync patterns |
| Mimikatz lsadump::dcsync | Attack tool used to perform DCSync |
| Impacket secretsdump.py | Python-based DCSync implementation |
| BloodHound | Identify accounts with replication rights |
Output Format
Hunt ID: TH-DCSYNC-[DATE]-[SEQ]
Technique: T1003.006
Domain Controller: [DC hostname]
Subject Account: [Account performing replication]
Source IP: [Non-DC IP address]
GUID Accessed: [Replication GUID]
Risk Level: [Critical/High/Medium/Low]
Recommended Action: [Disable account, reset krbtgt, investigate]