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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
75 lines
2.7 KiB
Markdown
75 lines
2.7 KiB
Markdown
---
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name: analyzing-powershell-empire-artifacts
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description: Detect PowerShell Empire framework artifacts in Windows event logs by
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identifying Base64 encoded launcher patterns, default user agents, staging URL structures,
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stager IOCs, and known Empire module signatures in Script Block Logging events.
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domain: cybersecurity
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subdomain: threat-hunting
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tags:
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- PowerShell-Empire
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- threat-hunting
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- Script-Block-Logging
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- base64
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- stager
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- C2
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- MITRE-ATT&CK
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- T1059.001
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- forensics
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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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d3fend_techniques:
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- Executable Denylisting
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- Execution Isolation
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- File Metadata Consistency Validation
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- Content Format Conversion
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- File Content Analysis
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nist_ai_rmf:
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- GOVERN-1.1
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- MEASURE-2.7
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- MANAGE-3.1
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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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- T1059.001
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- T1071.001
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- T1003.001
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- T1558.003
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- T1027.010
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---
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# Analyzing PowerShell Empire Artifacts
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## Overview
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PowerShell Empire is a post-exploitation framework consisting of listeners, stagers, and agents. Its artifacts leave detectable traces in Windows event logs, particularly PowerShell Script Block Logging (Event ID 4104) and Module Logging (Event ID 4103). This skill analyzes event logs for Empire's default launcher string (`powershell -noP -sta -w 1 -enc`), Base64 encoded payloads containing `System.Net.WebClient` and `FromBase64String`, known module invocations (Invoke-Mimikatz, Invoke-Kerberoast, Invoke-TokenManipulation), and staging URL patterns.
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## When to Use
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- When investigating security incidents that require analyzing powershell empire artifacts
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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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- Python 3.9+ with access to Windows Event Log or exported EVTX files
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- PowerShell Script Block Logging (Event ID 4104) enabled via Group Policy
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- Module Logging (Event ID 4103) enabled for comprehensive coverage
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## Key Detection Patterns
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1. **Default launcher** — `powershell -noP -sta -w 1 -enc` followed by Base64 blob
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2. **Stager indicators** — `System.Net.WebClient`, `DownloadData`, `DownloadString`, `FromBase64String`
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3. **Module signatures** — Invoke-Mimikatz, Invoke-Kerberoast, Invoke-TokenManipulation, Invoke-PSInject, Invoke-DCOM
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4. **User agent strings** — default Empire user agents in HTTP listener configuration
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5. **Staging URLs** — `/login/process.php`, `/admin/get.php` and similar default URI patterns
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## Output
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JSON report with matched IOCs, decoded Base64 payloads, timeline of suspicious events, MITRE ATT&CK technique mappings, and severity scores.
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