Mquery can be used to search through terabytes of malware in a blink of an eye:

Mquery : YARA Malware Query Accelerator

Ever had trouble searching for particular malware samples? Our project is an analyst-friendly web GUI to look through your digital warehouse.


Take a look at for a quick demo.

Unfortunately, you won’t find any actual malware there. For demo purposes we have indexed the sources of this project – so you can try to find all exceptions in our source code by using this yara rule:

rule find_exceptions: trojan
author = “mquery_demo”
$exception_string = “Exception”
all of them

Also Read – Horn3t : Powerful Visual Subdomain Enumeration at the Click of a Mouse

How does it work?

YARA is pretty fast, but searching through large dataset for given signature can take a lot of time. To countermeasure this, we have implemented a custom database called UrsaDB.

It is able to pre-filter the results, so it is only necessary to run YARA against a small fraction of binaries:

Quick start

  1. Start up the whole system (see Installation (Docker)).
  2. Web interface (by default) should be available on http://localhost:80/
  3. Upload files to be indexed to the samples directory, which is bind-mounted to all containers at /mnt/samples.
  4. Execute sudo docker-compose run ursadb-cli tcp://ursadb:9281 --cmd 'index "/mnt/samples";'. This will tell the database to index all the files in /mnt/samples (change the path depending on your system).
  5. The command should output the progress. Wait until the task is finished.
  6. After successful indexing, your files should be searchable. Open the web interface and upload some YARA rule, e.g.:

rule emotet4_basic: trojan
author = “”
$emotet4_rsa_public = { 8d ?? ?? 5? 8d ?? ?? 5? 6a 00 68 00 80 00 00 ff 35 [4] ff 35 [4] 6a 13 68 01 00 01 00 ff 15 [4] 85 }
$emotet4_cnc_list = { 39 ?? ?5 [4] 0f 44 ?? (FF | A3)}
all of them

Note: Any administrative tasks can be performed using ursacb-cli. See CERT-Polska/ursadb for a complete list of supported commands.

Installation (Docker)

Easy way to install the software is to build it from sources using docker-compose:

git clone –recurse-submodules
docker-compose up –scale daemon=3

where --scale daemon=... refers to the number of workers which will simultaneously process select/index jobs.

Hint: Your docker-compose must support v3 syntax of docker-compose.yml. Update your software if you have any problems.

For a production environment consider using kubernetes (take a look at kuebrnetes directory to get you started) or a manual installation (see below).

Installation (Manual)

There are three separate components:

  • ursadb (backend) – Run db.ursa tcp:// after compilation. (will listen on tcp port 9281). Needs persistent storage at cwd (for docker deployments use a volume. You don’t need to do anything special for bare metal installations)
  • mquery (web ui) – After creating a valid run python3 or expose it via uwsgi.
  • daemon – daemon to pick up yara queries. Uses the same file. You can use more than one daemon.

You need to mount files indexed by ursadb at the same logical path in mquery and daemons.

You also need to have a redis server somewhere (used as a task queue for mquery and daemon).