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https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git
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mukul975
cb8d79e068
- Add validated mitre_attack frontmatter to all 754 skills (286 distinct techniques), verified against MITRE ATT&CK v19.1 via the official mitreattack-python library: 0 revoked, deprecated, or invalid IDs - Curate precise per-skill technique IDs for forensics, malware-analysis, threat-intel, and red-team skills (e.g. DCSync -> T1003.006, Kerberoasting -> T1558.003, Pass-the-Ticket -> T1550.003) - Reconcile v19.1 tactic restructuring: Defense Evasion split into Stealth (TA0005) and Defense Impairment (TA0112); revoked T1562.* family and T1070.001/.002 remapped to active equivalents (T1685.*) - Normalize word-split tags across 35 skills (remove filename-derived stopword tags, add semantic cybersecurity tags) - Add api-reference.md for 3 skills that were missing it - Update README ATT&CK section with accurate v19.1 tactic distribution
82 lines
2.5 KiB
Markdown
82 lines
2.5 KiB
Markdown
---
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name: hunting-for-anomalous-powershell-execution
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description: 'Hunt for malicious PowerShell activity by analyzing Script Block Logging
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(Event 4104), Module Logging (Event 4103), and process creation events. The analyst
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parses Windows Event Log EVTX files to detect obfuscated commands, AMSI bypass attempts,
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encoded payloads, credential dumping keywords, and suspicious download cradles.
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Activates for requests involving PowerShell threat hunting, script block analysis,
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encoded command detection, or AMSI bypass identification.
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'
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domain: cybersecurity
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subdomain: threat-hunting
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tags:
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- powershell
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- script-block-logging
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- event-4104
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- amsi
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- threat-hunting
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- evtx
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- obfuscation
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version: '1.0'
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author: mahipal
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license: Apache-2.0
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nist_csf:
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- DE.CM-01
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- DE.AE-02
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- DE.AE-07
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- ID.RA-05
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mitre_attack:
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- T1046
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- T1057
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- T1082
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- T1083
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- T1003
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---
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# Hunting for Anomalous PowerShell Execution
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## Overview
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PowerShell Script Block Logging (Event ID 4104) records the full deobfuscated script text
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executed on a Windows endpoint, making it the primary data source for hunting malicious
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PowerShell. Combined with Module Logging (4103) and process creation events, analysts can
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detect encoded commands, AMSI bypass patterns, download cradles, credential theft tools,
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and fileless attack techniques even when the attacker uses obfuscation layers.
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## When to Use
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- When investigating security incidents that require hunting for anomalous powershell execution
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- When building detection rules or threat hunting queries for this domain
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- When SOC analysts need structured procedures for this analysis type
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- When validating security monitoring coverage for related attack techniques
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## Prerequisites
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- Windows Event Log exports (.evtx) from Microsoft-Windows-PowerShell/Operational
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- Python 3.8+ with python-evtx and lxml libraries
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- Script Block Logging enabled via Group Policy
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- Understanding of common PowerShell attack techniques
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## Steps
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1. Parse EVTX files extracting Event 4104 script block text and metadata
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2. Reassemble multi-part script blocks using ScriptBlock ID correlation
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3. Scan script text for AMSI bypass indicators and obfuscation patterns
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4. Detect encoded command execution and base64 payloads
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5. Identify download cradles, credential dumping, and lateral movement commands
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6. Score and prioritize findings by threat severity
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## Expected Output
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```json
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{
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"total_events": 1247,
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"suspicious_events": 23,
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"amsi_bypass_attempts": 2,
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"encoded_commands": 8,
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"download_cradles": 5,
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"credential_access": 3
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}
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```
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