Cryptography and Encryption

Munin – Online Hash Checker For Virustotal And Other Services

Munin - Online Hash Checker For Virustotal And Other Services

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.

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

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

Getting started

  1. Download / clone the repo
  2. Install required packages: pip3 install -r requirements.txt (on macOS add --user)
  3. (optional: required for –intense mode) Download PhantomJS and place it in your $PATH, e.g. /usr/local/bin http://phantomjs.org/download.html
  4. Set the API key for the different services in the munin.ini file
  5. Use the demo file for a first run: python munin.py -f munin-demo.txt --nocache

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

Website security, detecting malwares on the website and removal services, website backup services, daily website file scanning and file changes monitoring

About the author

Icarus

Add Comment

Click here to post a comment

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

%d bloggers like this: