mcpField
D
detecting-rdp-brute-force-attacks

detecting-rdp-brute-force-attacks

github.com/mukul975Security35.2k57 installsUpdated 8w ago
Repository

About detecting-rdp-brute-force-attacks

A detection skill for SOC analysts and incident investigators that parses Windows Security EVTX logs and correlates logon events to identify RDP brute-force patterns and possible compromises.

Key features

  1. 01Parse Event ID 4625 failures
  2. 02Extract source IPs and target usernames
  3. 03Count failures by source IP
  4. 04Identify username-spraying patterns
  5. 05Correlate failures with later successful logons
  6. 06Generate JSON detection reports

Use cases

  1. 01Investigate RDP brute force against Windows hosts
  2. 02Find possible successful logons after brute force attempts
  3. 03Build threat-hunting queries or detection rules

Install

Copy the command and run it in a terminal.

$npx skills add https://github.com/mukul975/anthropic-cybersecurity-skills --skill detecting-rdp-brute-force-attacks

After installing, type/detecting-rdp-brute-force-attacksin Claude Code to confirm it loaded.

Bundled files

References and scripts installed along with SKILL.md.

LICENSE
references/
api-reference.md
scripts/
agent.py

Details

From the project README

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, lxml libraries
  • 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

Comments

Markdown supported