seikaikyo/detecting-rdp-brute-force-attacks
external/anthropic-cybersecurity-skills/skills/detecting-rdp-brute-force-attacks/SKILL.md
Detect RDP brute force attacks by parsing Windows Security Event Logs (EVTX files, via python-evtx) for failed logon patterns (Event ID 4625, Logon Type 10/3), correlating with successful logons (Event ID 4624), and analyzing NLA failures and source IP frequency. Use when investigating exposed RDP endpoints, building SIEM detection rules for credential guessing, or confirming whether a compromised account followed a brute-force pattern.
$ install --global
skillsauthnpx skillsauth add seikaikyo/dash-skills detecting-rdp-brute-force-attacksInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
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OWASP Dep-Check
50%
Last scanned: Aug 9, 2026, 3:35 AM205.7s3 files scanned
SKILL.md
- name:
- detecting-rdp-brute-force-attacks
- description:
- Detect RDP brute force attacks by parsing Windows Security Event Logs
- domain:
- cybersecurity
- subdomain:
- threat-detection
- version:
- 1.0
- author:
- mahipal
- license:
- Apache-2.0
Detecting RDP Brute Force Attacks
Overview
RDP brute force attacks target Windows Remote Desktop Protocol services by attempting rapid credential guessing against exposed RDP endpoints. Detection relies on analyzing Windows Security Event Logs for Event ID 4625 (failed logon with Logon Type 10 or 3) and correlating with Event ID 4624 (successful logon) to identify compromised accounts. This skill covers parsing EVTX files with python-evtx, identifying attack patterns through source IP frequency analysis, detecting NLA bypass attempts, and generating actionable detection reports.
When to Use
- When investigating security incidents that require detecting rdp brute force attacks
- When building detection rules or threat hunting queries for this domain
- When SOC analysts need structured procedures for this analysis type
- When validating security monitoring coverage for related attack techniques
Prerequisites
- Python 3.9+ with
python-evtx,lxmllibraries - Windows Security EVTX log files (exported from Event Viewer or collected via WEF)
- Understanding of Windows authentication Event IDs (4624, 4625, 4776)
- Familiarity with RDP Logon Types (Type 3 for NLA, Type 10 for RemoteInteractive)
Steps
Step 1: Export Security Event Logs
Export Windows Security logs to EVTX format using Event Viewer or wevtutil:
wevtutil epl Security C:\logs\security.evtx
Step 2: Parse Failed Logon Events
Use python-evtx to parse Event ID 4625 entries, extracting source IP, target username, failure reason (Sub Status), and Logon Type fields.
Step 3: Analyze Attack Patterns
Identify brute force patterns by:
- Counting failed logons per source IP within time windows
- Detecting username spray attacks (many usernames from one IP)
- Correlating 4625 failures with subsequent 4624 success from same IP
Step 4: Generate Detection Report
Produce a JSON report with top attacking IPs, targeted accounts, time-based analysis, and compromise indicators.
Expected Output
JSON report containing:
- Total failed logon events and unique source IPs
- Top attacking IPs ranked by failure count
- Targeted usernames and failure sub-status codes
- Successful logons following brute force attempts (potential compromises)
- Time-series analysis of attack intensity
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