AS-REP roasting
AS-REP for pre-auth-disabled accounts cracked offline
categoryIdentity, authentication and credential attacksseverityHighdetectabilityLowlabnot yet measured
Detection opportunity what to watch for
A benign emulation of this technique’s linchpin behaviour — the command an attacker runs, and where we’ve detonated it in the lab, exactly what the SIEM saw, what caught it, and what it missed.
What the attacker runs
powershell -ExecutionPolicy Bypass -File C:\lab\detonate.ps1 -Technique T1558.004 -Tool atomic -RunId <run-id> -Command 'Invoke-AtomicTest T1558.004 -TestGuids d6139549-7b72-4e48-9ea1-324fc9bdf88a -TimeoutSeconds 120'Queued for lab measurement — not yet detonated.
Classification
19 values: 12 reviewed, 6 imported, 1 derived. What do these mean?
Exploitability
| Attack vector | Credential attacks |
|---|---|
| Reach (CVSS) | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Attacker skill required | Low |
| Resources required | Low |
| Likelihood / prevalence | High |
| Maturity | Commoditized |
Impact & scope
| Severity | High |
|---|---|
| Impact | Confidentiality |
| Platform | Windows |
| Environment | On-premises |
| Target asset class | Identity |
| Kill-chain phase (tactic) | Credential Access |
Detection & telemetry
| Detectability | Low |
|---|---|
| Testability | Atomic Red Team test |
| Data sources (ATT&CK data components) | Active Directory Credential RequestProcess Creation |
Detection & response
Mitigated by 14
- M1027 attack-mitigation
- M1041 attack-mitigation
- M1047 attack-mitigation
D3-ANCId3fendD3-CCSAd3fendD3-CHd3fendD3-CRd3fendD3-CROd3fendD3-CTSd3fendD3-DUCd3fendD3-MFAd3fendD3-RICd3fendD3-TBd3fendD3-TBAd3fend
Detected by 1
- DET0113 attack-detection-strategy
Tested by 3
615bd568-2859-41b5-9aed-61f6a88e48ddatomic8c385f88-4d47-4c9a-814d-93d9deec8c71atomicd6139549-7b72-4e48-9ea1-324fc9bdf88aatomic
Attack relationships
- Parent: Constrained delegation / S4U abuse
- Parent: Resource-based constrained delegation (RBCD)
- Parent: Unconstrained delegation abuse
Framework references
- Primary source: https://attack.mitre.org/techniques/T1558/
- attack: T1558.004 (primary)
Evidence & sources
- ev-0001 (Cyber Attack Taxonomy) — Name, definition and Example/ID taken verbatim from the 'Identity, authentication and credential attacks' table, line 323 of Cyber-Attack-Taxonomy.md
- ev-0002 (MITRE Enterprise ATT&CK v19.2 (STIX 2.1)) — ATT&CK usage prevalence: 1 groups/software/campaigns reference this technique (ATT&CK enterprise v19.2)