Analyze Windows PowerShell event logs to reconstruct scripts split across records and identify encoded commands, suspicious downloads, and security scanning bypass attempts. Produce a report with recovered scripts, risk scores, and mappings to documented attack techniques.
Parse Windows PowerShell Script Block Logs (Event ID 4104) from EVTX files to detect obfuscated commands, encoded payloads, and living-off-the-land techniques. Uses python-evtx to extract and reconstruct multi-block scripts, applies entropy analysis and pattern matching for Base64-encoded commands, Invoke-Expression abuse, download cradles, and AMSI bypass attempts.
Review the instructions the agent will receive before you install.
pip install python-evtx lxmlMicrosoft-Windows-PowerShell%4Operational.evtx-EncodedCommand, FromBase64String)DownloadString, DownloadFile, Invoke-WebRequest, Net.WebClient)AmsiUtils, amsiInitFailed)python scripts/agent.py --evtx-file /path/to/PowerShell-Operational.evtx --output ps_analysis.json
import base64
if "-encodedcommand" in script_text.lower():
encoded = script_text.split()[-1]
decoded = base64.b64decode(encoded).decode("utf-16-le")
Scripts split across multiple 4104 events share a ScriptBlockId. Concatenate blocks ordered by MessageNumber to recover the full script.
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