Possible Kerberoasting via RC4 Service Ticket Requests

ATT&CK techniques

Cred Access

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

What it detects

This rule detects Kerberos service ticket requests using weak RC4-HMAC encryption from non-machine accounts, the core telemetry of Kerberoasting where an attacker requests SPN tickets to crack service account passwords offline. Machine and krbtgt requests are excluded so the remaining user-driven RC4 requests highlight likely credential-access activity.

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

Suspicious SQL Service Principal Name Enumeration via Setspn

Windows: Suspicious Kerberos Ticket Requests from PowerShell Using KerberosRequestorSecurityToken

Possible Kerberoasting via RC4 Service Ticket Requests

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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