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analyzing-powershell-empire-artifacts

Search Windows PowerShell logs for traces of Empire, a framework used after a system is compromised. Identify characteristic launch commands, encoded code, module calls, and communication paths, then report suspicious events with timelines and severity scores.

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Detect PowerShell Empire post-exploitation framework artifacts in Windows Script Block Logging (Event ID 4104) and Module Logging (Event ID 4103), including the default launcher string, Base64-encoded WebClient/FromBase64String payloads, known module invocations (Invoke-Mimikatz, Invoke-Kerberoast), and staging URL patterns. Use when hunting for or confirming Empire C2 activity in Windows event logs.

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Good for

  • Investigating suspected Empire activity
  • Checking encoded commands and communication paths
  • Building detection rules from Empire indicators
  • Reviewing monitoring coverage for related attacks

Files included (4)

  • SKILL.md2.8 KB
  • LICENSE11.0 KB
  • references/api-reference.md3.3 KB
  • scripts/agent.py10.6 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Analyzing PowerShell Empire Artifacts

Overview

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.

When to Use

  • When investigating security incidents that require analyzing powershell empire artifacts
  • 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 access to Windows Event Log or exported EVTX files
  • PowerShell Script Block Logging (Event ID 4104) enabled via Group Policy
  • Module Logging (Event ID 4103) enabled for comprehensive coverage

Key Detection Patterns

  1. Default launcher — powershell -noP -sta -w 1 -enc followed by Base64 blob
  2. Stager indicators — System.Net.WebClient, DownloadData, DownloadString, FromBase64String
  3. Module signatures — Invoke-Mimikatz, Invoke-Kerberoast, Invoke-TokenManipulation, Invoke-PSInject, Invoke-DCOM
  4. User agent strings — default Empire user agents in HTTP listener configuration
  5. Staging URLs — /login/process.php, /admin/get.php and similar default URI patterns

Output

JSON report with matched IOCs, decoded Base64 payloads, timeline of suspicious events, MITRE ATT&CK technique mappings, and severity scores.

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