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| | | | | | | | | | | | | | | | | | | | /)\|
|_| |_| |_| \_|__|_| |_| |_| _|_|_ |_| |_| // /
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Online Hash Checker for Virustotal and Other Services
Florian Roth
What is 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:
Screenshot
Default Mode - Read Hashes from File
Usage
usage: munin.py [-h] [-f path] [--vh search-string]
[--vhrule search-string] [-o output] [--vtwaitquota]
[--vtminav min-matches] [--limit hash-limit]
[--vhmaxage days] [-c cache-db] [-i ini-file]
[-s sample-folder] [--comment] [-p vt-comment-prefix]
[--download] [-d download_path] [--nocache] [--nocsv]
[--verifycert] [--sort] [--web] [-w port] [--cli]
[--rescan] [--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)
--vh search-string Query Valhalla for hashes by keyword, tags, YARA
rule name, Mitre ATT&CK software (e.g. S0154),
technique (e.g. T1023) or threat group (e.g. G0049)
--vhrule search-string
Query Valhalla for hashes via rules by keyword,
tags, YARA rule name, Mitre ATT&CK software (e.g.
S0154), technique (e.g. T1023) or threat group
(e.g. G0049)
-o output Output file for results (CSV)
--vtwaitquota Do not continue if VT quota is exceeded but wait
for the next day
--vtminav min-matches
Minimum number of AV matches to query hash info
from VT"
--limit hash-limit Exit after handling this much new hashes in batch
mode (cache ignored).
--vhmaxage days Maximum age of sample on Valhalla to process
-c cache-db Name of the cache database file (default: vt-hash-
db.json)
-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
--nocsv Do not write a CSV with the results
--verifycert Verify SSL/TLS certificates
--sort Sort the input lines
--web Run Munin as web service
-w port Web service port
--cli Run Munin in command line interface mode
--rescan Trigger a rescan of each analyzed file
--debug Debug output
Features
- Retrieves valuable information from Virustotal via API (JSON response) and other information via permalink (HTML parsing)
- Retrieves extra information from a list of platforms
- 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 reports
- Queries multiple MISP instances for available events
- Queries Any.run sandbox for reports
- Queries CAPE sandbox for reports
- Queries URLhaus for reports
- Queries Malshare for available samples
- Queries Valhalla for YARA rule matches
- Imphash duplicates in current batch > allows you to spot overlaps in import table hashes
- PE signature duplicate checks
Operation Modes
- Default - by providing an input file (-f) with hashes or sample directory (-s)
- Query - to search hashes from Valhalla by keyword, tags, ATT&CK technique (e.g. T1023), ATT&CK threat group (e.g. G0049) or rule name (-q)
- Command Line Interface - using the --cli parameter
- Web Service Mode - using the --web parameter
Getting started
- Download / clone the repo
- Install required packages:
pip3 install -r requirements.txt(on macOS add--user) - Set the API keys for the different services in your custom ini file
cp munin.ini my.ini(see sectionGet the API Keysfor help) - Use the demo file for a first run:
python munin.py -i my.ini -f munin-demo.txt
Requirements
- Python 3.7 and higher
- Internet Connection (Proxy Support; SSL/TLS interception can be a problem)
Typical Command Lines
Process a Virustotal Retrohunt result and sort the lines before checking so that matched signatures are checked in blocks
python3 munin.py -i my.ini -f ~/Downloads/retro_huntProcess a directory with samples and check their hashes online
python3 munin.py -i my.ini -s ~/malware/case34Use the command line interface mode (new in v0.14)
python3 munin.py -i my.iniGet the API Keys
Virustotal
- Create an account here https://www.virustotal.com/#/join-us
- Check
Profile > My API keyfor your public API key
MalShare
Register here https://malshare.com/register.php
Malware Bazaar
Register here https://bazaar.abuse.ch/. You can then find your API key in your Account Overview.
Hybrid Analysis
- Create an account here https://www.hybrid-analysis.com/signup
- After login, check
Profile > API key
MISP
- Log into your MISP
- Go to your profile "My Profile"
- The value of
Authkeyis used as API key - Note that the .ini file uses both a list for the MISP instances and for the respective API keys
Valhalla
Currently for customers or invited researchers only
https://valhalla.nextron-systems.com/
Hashlookup
Hashlookup CIRCL's instance is provided free of charge and served as a best-effort basis.
Command Line Interface Mode
Start munin with --cli and follow the instruction.
E.g.
python3 munin.py -i my.ini --cliPaste content with hash values in it and then press CTRL+D to finalize the input. The last line needs a line break at its end.
In the default, it will create a CSV file with the current date in the file name.
Web Service Mode
Start munin with --web and optional select a port -w port.
E.g.
python3 munin.py -i my.ini --web -w 8080The web service waits for strings in the following URL scheme.
http://server:port/<string>The string can be any string without line breaks, e.g.
Emotet:1585ad28f7d1e0ca696e6c6c2f1d008a
ed01ebfbc9eb5bbea545af4d01bf5f1071661840480439c6e5babe8e080e41aa;IOC1
dc9b5e8aa6ec86db8af0a7aa897ca61db3e5f3d2e0942e319074db1aaccfdc83The result will look like this:
{
"comment": "Emotet",
"commenter": "-",
"comments": "0",
"copyright": "Copyright (C) America Online, Inc. 1999 - 2004",
"description": "Utilities",
"expired": false,
"filenames": "sourcedev.exe, MISCUTIL, x8ykNnr_9WofXq7Nh_xuEzSPW.exe, jwuKBLWN681ztj6Zks.exe",
"filetype": "Win32 EXE",
"first_submitted": "2019-01-19 13:46:21 UTC ( 2 months, 2 weeks ago )",
"firstsubmission": "2019-01-19 13:46:21 UTC ( 2 months, 2 weeks ago )",
"harmless": false,
"hash": "1585ad28f7d1e0ca696e6c6c2f1d008a",
"hybrid_available": false,
"hybrid_compromised": "-",
"hybrid_date": "-",
"hybrid_score": "-",
"imphash": "2820d9bdc397f88a8a1e957e1a824482",
"last_submitted": "2019-02-27 09:44:03",
"malshare_available": false,
"md5": "1585ad28f7d1e0ca696e6c6c2f1d008a",
"misp_available": true,
"misp_events": "",
"misp_info": [],
"mssoft": false,
"origname": "-",
"positives": 48,
"rating": "malicious",
"res_color": "\u001b[41m",
"result": "48 / 64",
"revoked": false,
"sha1": "4561d0ad575d5f02fb06e062a37de15861c3bd89",
"sha256": "35e304d10d53834e3e41035d12122773c9a4d183a24e03f980ad3e6b2ecde7fa",
"signed": false,
"signer": "-",
"total": 64,
"urlhaus_available": true,
"vendor_results": {
"CrowdStrike": "win/malicious_confidence_100% (W)",
"ESET-NOD32": "a variant of Win32/Kryptik.GOUY",
"F-Secure": "Trojan.TR/AD.Emotet.pdiuu",
"GData": "Trojan.GenericKD.40960256",
"Kaspersky": "HEUR:Trojan.Win32.Generic",
"McAfee": "Emotet-FLL!1585AD28F7D1",
"Microsoft": "Trojan:Win32/Emotet.DN",
"Sophos": "Mal/Emotet-Q",
"Symantec": "Trojan.Gen.2",
"TrendMicro": "-"
},
"virus": "Microsoft: Trojan:Win32/Emotet.DN / Kaspersky: HEUR:Trojan.Win32.Generic / McAfee: Emotet-FLL!1585AD28F7D1 / CrowdStrike: win/malicious_confidence_100% (W) / ESET-NOD32: a variant of Win32/Kryptik.GOUY / Symantec: Trojan.Gen.2 / F-Secure: Trojan.TR/AD.Emotet.pdiuu / Sophos: Mal/Emotet-Q / GData: Trojan.GenericKD.40960256",
"virusbay_available": false,
"vt_positives": 48,
"vt_queried": false,
"vt_total": 64,
"vt_verbose_msg": "Scan finished, information embedded"
}The queries to Virustotal need to be throttled. Therefore the web service applies a cool down time, that is minimized by subtracting the time it took to process all other platforms from the wait time of 15 seconds.
cooldown_time = vt_wait_time - process_time
During the cooldown, requests will return this response:
{"status": "VT cooldown active"}The cool down is not relevant when requesting hashes that are already in the lookup cache.
Munin Hosts
The Munin host and IP checker script (munin-host.py) retrieves more information on IP addresses and host/domain names in IOC lists.
Usage
usage: munin-host.py [-h] [-f path] [-o output] [-m max-items] [-c cache-db]
[-i ini-file] [--nocache] [--nocsv] [--recursive]
[--download] [-d download_path] [--dups] [--noresolve]
[--ping] [--debug]
Virustotal Online Checker (IP/Domain)
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)
-o output Output file for results (CSV)
-m max-items Maximum number of items (urls, hosts, samples) to show
-c cache-db Name of the cache database file (default: vt-hosts-
db.json)
-i ini-file Name of the ini file that holds the API keys
--nocache Do not use the load the cache db (vt-check-cache.pkl)
--nocsv Do not write a CSV with the results
--recursive Process the resolved IPs as well
--download Try to download the URLs (directories with host/ip names)
-d download_path Store the downloads to the given directory
--dups Do not skip duplicate hashes
--noresolve Do not perform DNS resolve test on found domain names
--ping Perform ping check on IPs (speeds up process if many
public but internally routed IPs appear in text file)
--debug Debug output
Screenshot
Examples
Parse the demo file, extract IPs and hosts, don't just check the domains that are still resolvable and download samples directly from the remote systems.
python3 munin-host.py -i your-key.ini -f ./munin-hosts-demo.txt --noresolve --download
Warning
Using munin-host.py in an IDS monitored network will cause numerous alerts as munin-host.py performs DNS lookups for malicious domains and has the option to download malicious samples.
Issues
pycurl on macOS
The script munin-host.py requires the module pycurl. It's sometimes tricky to make it work on macOS as it requires an openssl to be installed, which is then used in the build process.
If error's occur try the following (some environments will require pip3)
pip uninstall pycurl
brew update
brew reinstall openssl
export PKG_CONFIG_PATH="/usr/local/opt/openssl/lib/pkgconfig"
export LDFLAGS="-L/usr/local/opt/openssl/lib"
export CPPFLAGS="-I/usr/local/opt/openssl/include"
export PYCURL_SSL_LIBRARY=openssl
pip install pycurl --global-option="--with-openssl"
Hugin for Virustotal Retrohunts
The Hugin script (hugin.py) retrieves and displays information to all samples returned in a retrohunt. The big advantage is that you don't have to wait 15 seconds between each sample request but pull the full JSON result file via v3 of the Virustotal API. This way you get your results immediately. The disadvantage is that other services like Any.run, Hybrid-Analysis, MISP or Valhalla don't get queried with Hugin.
Usage
usage: hugin.py [-h] [-r retrohunt-name] [-i ini-file]
[--csv-path CSV_PATH] [--debug] [--no-comments]
Retrohunt Checker
optional arguments:
-h, --help show this help message and exit
-r retrohunt-name Name for the queried retrohunt
-i ini-file Name of the ini file that holds the VT API key
--csv-path CSV_PATH Write a CSV with the results
--debug Debug output
--no-comments Skip VirusTotal comments
Examples
Parse a retrohunt and export a CSV file with the results.
python3 hugin.py -i config-with-your-key.ini -r retrohunt-123456789