Need help with yara?
Click the “chat” button below for chat support from the developer who created it, or find similar developers for support.

About the developer

VirusTotal
5.1K Stars 1.1K Forks BSD 3-Clause "New" or "Revised" License 2.8K Commits 157 Opened issues

Description

The pattern matching swiss knife

Services available

!
?

Need anything else?

Contributors list

Join the chat at https://gitter.im/VirusTotal/yara AppVeyor build status Coverity status

YARA in a nutshell

YARA is a tool aimed at (but not limited to) helping malware researchers to identify and classify malware samples. With YARA you can create descriptions of malware families (or whatever you want to describe) based on textual or binary patterns. Each description, a.k.a. rule, consists of a set of strings and a boolean expression which determine its logic. Let's see an example:

rule silent_banker : banker
{
    meta:
        description = "This is just an example"
        threat_level = 3
        in_the_wild = true

strings:
    $a = {6A 40 68 00 30 00 00 6A 14 8D 91}
    $b = {8D 4D B0 2B C1 83 C0 27 99 6A 4E 59 F7 F9}
    $c = "UVODFRYSIHLNWPEJXQZAKCBGMT"

condition:
    $a or $b or $c

}

The above rule is telling YARA that any file containing one of the three strings must be reported as silent_banker. This is just a simple example, more complex and powerful rules can be created by using wild-cards, case-insensitive strings, regular expressions, special operators and many other features that you'll find explained in YARA's documentation.

YARA is multi-platform, running on Windows, Linux and Mac OS X, and can be used through its command-line interface or from your own Python scripts with the yara-python extension.

Additional resources

Do you use GitHub for storing your YARA rules? YARA-CI may be a useful addition to your toolbelt. This is GitHub application that provides continuous testing for your rules, helping you to identify common mistakes and false positives.

If you plan to use YARA to scan compressed files (.zip, .tar, etc) you should take a look at yextend, a very helpful extension to YARA developed and open-sourced by Bayshore Networks.

Additionally, the guys from InQuest have curated an awesome list of YARA-related stuff.

Who's using YARA

Are you using it? Want to see your site listed here?

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.