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Before yesterdayTools

Z9 - PowerShell Script Analyzer

By: Zion3R

Abstract

This tools detects the artifact of the PowerShell based malware from the eventlog of PowerShell logging.
Online Demo


Install

git clone https://github.com/Sh1n0g1/z9

How to use

usage: z9.py [-h] [--output OUTPUT] [-s] [--no-viewer] [--utf8] input

positional arguments:
  input                 Input file path

options:
  -h, --help            show this help message and exit
  --output OUTPUT, -o OUTPUT
                        Output file path
  -s, --static          Enable Static Analysis mode
  --no-viewer           Disable opening the JSON viewer in a web browser
  --utf8                Read scriptfile in utf-8 (deprecated)

Analyze Event Logs (Recommended)

python z9.py <input file> -o <output json>
python z9.py <input file> -o <output json> --no-viewer
Arguments Meaning
input file XML file exported from eventlog
-o output json filename of z9 result
--no-viewer do not open the viewer

Example)

python z9.py util\log\mwpsop.xml -o sample1.json

Analyze PowerShell File Statically

  • This approach will only do the static analysis and may not provide a proper result especially when the sample is obfuscated.
python z9.py <input file> -o <output json> -s
python z9.py <input file> -o <output json> -s --utf8
python z9.py <input file> -o <output json> -s --no-viewer
Arguments Meaning
input file PowerShell file to be analyzed
-o output json filename of z9 result
-s perform static analysis
--utf8 specify when the input file is in UTF-8
--no-viewer do not open the viewer

Example)

python z9.py malware.ps1 -o sample1.json -s

How to prepare the XML file

Enable PowerShell Logging

  1. Right-click and merge this registry file:util/enable_powershell_logging.reg .
  2. Reboot the PC
  3. All powershell execution will be logged in eventlog

Export Eventlog to XML

  1. Execute this batch file:util/collect_psevent.bat .
  2. The XML files will be created under util/log directory.
  3. Both XML file can be parsed by this tool.

How to Delete the Existing Eventlog

Authors

hanataro-miz
si-tm
take32457
Bigdrea6
azaberrypi
Sh1n0g1



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