Anthropic-Cybersecurity-Skills/skills/detecting-golden-ticket-forgery/references/api-reference.md

Golden Ticket Forgery Detection API Reference

Windows Security Event IDs

Event ID 4768 - TGT Requested (AS-REQ)

Key Fields:
  TargetUserName        - Account requesting TGT
  TargetDomainName      - Domain of requesting account
  IpAddress             - Source IP
  TicketEncryptionType  - 0x12 (AES256), 0x11 (AES128), 0x17 (RC4)
  PreAuthType           - 15 = PA-ENC-TIMESTAMP (normal)

Event ID 4769 - TGS Requested (TGS-REQ)

Key Fields:
  TargetUserName        - Account using the ticket
  ServiceName           - SPN of target service
  IpAddress             - Source IP of requestor
  TicketEncryptionType  - 0x17 = RC4 (Golden Ticket indicator)
  TicketOptions         - Kerberos ticket flags
  LogonGuid             - Correlate with Event 4624

Detection Indicators

Indicator	Normal	Golden Ticket
TicketEncryptionType	0x12 (AES256)	0x17 (RC4-HMAC)
TGT Lifetime	<= 10 hours	Often 10+ years
TGS without TGT	Always preceded by 4768	4769 without 4768
Domain field	Matches domain	May be blank or incorrect

Splunk SPL Queries

RC4 TGS Detection (Golden Ticket)

index=wineventlog sourcetype="WinEventLog:Security" EventCode=4769
  TicketEncryptionType=0x17
  ServiceName!="krbtgt"
| stats count by TargetUserName, IpAddress, ServiceName
| where count > 3
| sort -count

Orphaned TGS (No Prior TGT)

index=wineventlog EventCode=4769
| join type=left TargetUserName
  [search index=wineventlog EventCode=4768
   | dedup TargetUserName | fields TargetUserName]
| where isnull(TargetUserName)
| stats count by TargetUserName, IpAddress

krbtgt Service Anomaly

index=wineventlog EventCode=4769 ServiceName="krbtgt*"
| table _time, TargetUserName, IpAddress, TicketEncryptionType

Elastic KQL

RC4 Downgrade in Elastic

event.code: "4769" AND winlog.event_data.TicketEncryptionType: "0x17"
  AND NOT winlog.event_data.ServiceName: "krbtgt"

MITRE ATT&CK

Technique	ID	Description
Steal or Forge Kerberos Tickets: Golden Ticket	T1558.001	Forge TGT using krbtgt hash

CLI Usage

python agent.py --evtx-xml security_events.xml --output golden_ticket_report.json
python agent.py --show-splunk
python agent.py --evtx-xml events.xml --max-ticket-hours 8