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mukul975
69 lines
2.1 KiB
Markdown
69 lines
2.1 KiB
Markdown
# API Reference: Detecting RDP Brute Force Attacks
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## Windows Security Event IDs
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| Event ID | Description | Key Fields |
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|----------|-------------|------------|
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| 4625 | Failed logon attempt | TargetUserName, IpAddress, SubStatus, LogonType |
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| 4624 | Successful logon | TargetUserName, IpAddress, LogonType |
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| 4776 | NTLM credential validation | TargetUserName, Workstation, Status |
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| 4771 | Kerberos pre-auth failed | TargetUserName, IpAddress, Status |
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## Logon Types for RDP
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| Type | Name | Context |
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|------|------|---------|
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| 3 | Network | RDP with NLA enabled (pre-auth) |
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| 10 | RemoteInteractive | RDP session after NLA |
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## Failure Sub-Status Codes
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| Sub-Status | Meaning |
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|------------|---------|
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| 0xC0000064 | User does not exist |
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| 0xC000006A | Wrong password |
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| 0xC0000234 | Account locked out |
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| 0xC0000072 | Account disabled |
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| 0xC0000193 | Account expired |
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| 0xC0000071 | Password expired |
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## python-evtx Library Usage
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```python
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import Evtx.Evtx as evtx
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with evtx.Evtx("Security.evtx") as log:
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for record in log.records():
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xml_str = record.xml()
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```
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Install: `pip install python-evtx lxml`
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## wevtutil Export Commands
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```bash
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# Export Security log to EVTX
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wevtutil epl Security C:\logs\security.evtx
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# Query failed RDP logons
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wevtutil qe Security /q:"*[System[(EventID=4625)] and EventData[Data[@Name='LogonType']='10']]" /f:text
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# Count recent failed logons
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wevtutil qe Security /q:"*[System[(EventID=4625)]]" /c:100 /rd:true /f:text
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```
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## Detection Thresholds
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| Pattern | Threshold | Indicator |
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|---------|-----------|-----------|
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| Brute force | >10 failures/IP in 15 min | Single-target credential guessing |
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| Password spray | >5 unique users/IP | Multi-user single-password attack |
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| Compromise | 4625 followed by 4624 from same IP | Successful brute force |
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## References
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- Microsoft Event 4625: https://learn.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4625
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- Microsoft Event 4624: https://learn.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4624
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- python-evtx: https://github.com/williballenthin/python-evtx
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- LogonTracer: https://github.com/JPCERTCC/LogonTracer
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