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Munin

Munin is a online hash checker utility that retrieves valuable information from various online sources

The current version of Munin queries the following services:

  • Virustotal
  • Malshare
  • HybridAnalysis

Note: Munin is based on the script “VT-Checker”, which has been maintained in the LOKI repository. Also used plagiarism checker to check and ensure the unique content.

Munin Usage

usage: munin.py [-h] [-f path] [-c cache-db] [-i ini-file] [-s sample-folder]
                [--comment] [-p vt-comment-prefix] [--download]
                [-d download_path] [--nocache] [--intense] [--retroverify]
                [-r num-results] [--nocsv] [--verifycert] [--sort] [--debug]

Online Hash Checker

optional arguments:
  -h, --help            show this help message and exit
  -f path               File to process (hash line by line OR csv with hash in
                        each line - auto-detects position and comment)
  -c cache-db           Name of the cache database file (default: vt-hash-
                        db.pkl)
  -i ini-file           Name of the ini file that holds the API keys
  -s sample-folder      Folder with samples to process
  --comment             Posts a comment for the analysed hash which contains
                        the comment from the log line
  -p vt-comment-prefix  Virustotal comment prefix
  --download            Enables Sample Download from Hybrid Analysis. SHA256
                        of sample needed.
  -d download_path      Output Path for Sample Download from Hybrid Analysis.
                        Folder must exist
  --nocache             Do not use cache database file
  --intense             Do use PhantomJS to parse the permalink (used to
                        extract user comments on samples)
  --retroverify         Check only 40 entries with the same comment and
                        therest at the end of the run (retrohunt verification)
  -r num-results        Number of results to take as verification
  --nocsv               Do not write a CSV with the results
  --verifycert          Verify SSL/TLS certificates
  --sort                Sort the input lines (useful for VT retrohunt results)
  --debug               Debug output

Also ReadSILENTTRINITY – A Post-Exploitation Agent Powered By Python, IronPython, C#/.NET

Features

  • MODE A: Extracts hashes from any text file based on regular expressions
  • MODE B: Walks sample directory and checks hashes online
  • Retrieves valuable information from Virustotal via API (JSON response) and other information via permalink (HTML parsing)
  • Keeps a history (cache) to query the services only once for a hash that may appear multiple times in the text file
  • Cached objects are stored in JSON
  • Creates CSV file with the findings for easy post-processing and reporting
  • Appends results to a previous CSV if available

Displays

  • Hash and comment (comment is the rest of the line of which the hash has been extracted)
  • AV vendor matches based on a user defined list
  • Filenames used in the wild
  • PE information like the description, the original file name and the copyright statement
  • Signer of a signed portable executable
  • Result based on Virustotal ratio
  • First and last submission
  • Tags for certain indicators: Harmless, Signed, Expired, Revoked, MSSoftware

Extra Checks

  • Queries Malshare.com for sample uploads
  • Queries Hybrid-Analysis.com for present analysis
  • Imphash duplicates in current batch > allows you to spot overlaps in import table hashes

Typical Command Lines

Process a Virustotal Retrohunt result and sort the lines before checking so that matched signatures are checked in blocks

python munin.py -f my.ini -f ~/Downloads/retro_hunt

Process an IOC file and show who commented on these samples on Virustotal (uses PhantomJS, higher CPU usage)

python munin.py -f my.ini -f ~/Downloads/misp-event-1234.csv --sort --intense

Process a directory with samples and check their hashes online

python munin.py -f my.ini -s ~/malware/case34

Get the API Keys used by Munin

Virustotal

  1. Create an account here https://www.virustotal.com/#/join-us
  2. Check Profile > My API key for your public API key

Malshare

Register here https://malshare.com/register.php

Hybrid Analysis

  1. Create an account here https://www.hybrid-analysis.com/signup
  2. After login, check Profile > API key

Screenshot