Malicious Kerberoasting or AS-REP Roasting via Rubeus

ATT&CK techniques

Cred Access

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1558.003Kerberoasting
- T1558.004AS-REP Roasting
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects the Rubeus toolkit being tasked to request Kerberos service tickets or AS-REP responses for offline cracking as demonstrated in the WithSecure Discovery and Lateral Movement lab where a Covenant Grunt executed Rubeus kerberoast and asreproast actions. Kerberoasting and AS-REP roasting let an attacker recover domain credentials without touching a domain controller interactively which makes this a high value credential access precursor to lateral movement.

Reporting behind it

Related detections9 linkedT1558.003 — drag to rearrange

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Suspicious Kerberoasting LDAP Search Filter for Service Principal Names

Suspicious Kerberoasting via RC4 Service Ticket Request for MSSQLSvc SPN (via security)

Malicious Kerberos Ticket File Creation Indicating Credential Theft (via file_event)

Suspicious Kerberoasting via setspn Service Principal Query

Masquerading Kerberos Ticket Abuse via Rubeus (via process_creation)

Possible Targeted Kerberoasting via servicePrincipalName Modification

Malicious Kerberoasting or AS-REP Roasting via Rubeus

Pivot detection · T1558.003 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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