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mukul975
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Complete skill folder anatomy across all cybersecurity skills: - scripts/agent.py: 80-150 line Python agents using real libraries (impacket, boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.) - references/api-reference.md: real API documentation with method signatures - LICENSE: MIT license for all skill folders
50 lines
1.4 KiB
Markdown
50 lines
1.4 KiB
Markdown
# API Reference: Detecting Kerberoasting Attacks
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## python-evtx Library
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```python
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from Evtx.Evtx import FileHeader
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with open("Security.evtx", "rb") as f:
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fh = FileHeader(f)
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for record in fh.records():
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xml_string = record.xml()
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```
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## Event ID 4769 - Kerberos TGS Request
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```xml
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<EventData>
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<Data Name="TargetUserName">svc_sql</Data>
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<Data Name="ServiceName">MSSQLSvc/db01.corp.local:1433</Data>
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<Data Name="TicketEncryptionType">0x17</Data>
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<Data Name="TicketOptions">0x40810000</Data>
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<Data Name="IpAddress">::ffff:10.0.0.50</Data>
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<Data Name="Status">0x0</Data>
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</EventData>
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```
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## Encryption Type Values
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| Hex | Type | Risk |
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|-----|------|------|
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| 0x17 | RC4-HMAC | Kerberoasting indicator |
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| 0x18 | RC4-HMAC-EXP | Kerberoasting indicator |
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| 0x11 | AES128-CTS-HMAC-SHA1 | Normal |
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| 0x12 | AES256-CTS-HMAC-SHA1 | Normal |
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## Detection Logic
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1. Filter Event 4769 where TicketEncryptionType = 0x17 (RC4)
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2. Exclude machine accounts (ServiceName ending in `$`)
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3. Exclude krbtgt service
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4. Alert on high-volume TGS from single source (>10 unique SPNs in 5 min)
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5. Correlate with Event 4624 for source attribution
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## Event ID 4624 - Logon Event (Correlation)
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```xml
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<Data Name="TargetUserName">attacker_user</Data>
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<Data Name="LogonType">3</Data>
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<Data Name="IpAddress">10.0.0.50</Data>
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<Data Name="WorkstationName">WORKSTATION1</Data>
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```
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## MITRE ATT&CK Mapping
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- T1558.003 - Kerberoasting
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- T1558 - Steal or Forge Kerberos Tickets
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