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kerberos-attacks

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Kerberos-based Active Directory attacks driven by hand with standard tooling (Kerberoasting, AS-REP roasting, and delegation abuse: unconstrained, constrained/S4U, RBCD). Use when the target has SPN-bearing service accounts, accounts without pre-authentication, or delegation configured on computer/user objects, and you want the exact impacket/Rubeus/bloodyAD command, the hash format and hashcat mode, the Windows Event IDs that fire, and the remediation to write up.

skills/kerberos-attacks/SKILL.md

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# Kerberos Attacks

Standard-tooling playbook for the four Kerberos abuse families you meet on almost every internal AD engagement. You drive every tool yourself. This skill tells you what each attack is, the exact command, how the loot looks and how to crack it, what the DC logs, and what the remediation write-up should say.

Requirements before you touch these: valid domain credentials (any user is enough for Kerberoasting and delegation reads; AS-REP roasting needs only a username list), correct DNS pointing at the DC, and clock skew under 5 minutes or Kerberos rejects your tickets (`KRB_AP_ERR_SKEW`). Sync with `sudo ntpdate <dc-ip>` or `faketime`.

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## 1. Kerberoasting

**MITRE ATT&CK:** T1558.003 (Steal or Forge Kerberos Tickets: Kerberoasting)

**What it is.** Any authenticated user can request a service ticket (TGS) for any account that has a Service Principal Name (SPN) set. The TGS is encrypted with the service account's password-derived key. If the DC hands you an RC4 (etype 23) ticket, you crack it offline to recover the account's cleartext password. Service accounts are the target because they often have weak, non-expiring, human-set passwords and elevated rights.
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