It is mainly in use by security researchers to classify malware. Summary YARA is a tool that can be used to identify files that meet certain conditions. Note that identifier/value pairs defined in the metadata section can’t be used in the condition section, their only purpose is to store additional information about the rule. The assigned values can be strings, integers, or a Boolean value. Malwarebytes Business Support Help Center home page. Download now > Learn more about AdwCleaner > BROWSER GUARD Blocks ads and scams in Chrome, Edge, Safari and Firefox for a cleaner, safer browsing experience. The metadata identifiers are always followed by an equal sign and the set value. Configure DNS Filtering rules using the Rules tab on the DNS Filtering page. Metadata can be added to help identify the files that were picked up by a certain rule. If you would like to know more you can find it in the YARA documentation. There are many more advanced conditions you can use, but they are outside the scope of this post. Regular expressions, with the same modifiers as text strings.Text strings, with modifiers: nocase, fullword, wide, and ascii.Hexadecimal, in combination with wild-cards, jumps, and alternatives.There are several types of strings you can look for: If either of those strings is found, then the result of the rule is true. The rule shown above is named vendor and looks for the strings “Vendor name” and “Alias name”. The strings sections is where you can define the strings that will be looked for in the file. To give the condition section a meaning you will also need a strings section. You can also include another rule as part of your conditions. Conditions are by design Boolean expressions and can contain all the usual logical and relational operators. It contains a Boolean expression that determines the result. ![]() ![]() This section specifies when the rule result is true for the object (file) that is under investigation. The condition section is the only one that is required. There is a list of YARA keywords that are not allowed to be used as an identifier because they have a predefined meaning. We were able to use Malwarebyte’s split tunneling feature to specify which apps and programs were protected by the VPN and which could bypass it (and access the internet directly). We discovered this feature in the Network Settings tab. The identifier can contain any alphanumeric character and the underscore character, but the first character is not allowed to be a digit. Malwarebytes calls the split tunneling feature Connection rules. SyntaxĮach rule has to start with the word rule, followed by the name or identifier. It was developed with the idea to describe patterns that identify particular strains or entire families of malware. YARA was originally developed by Victor Alvarez of Virustotal and is mainly used in malware research and detection. YARA rules are a way of identifying malware (or other files) by creating rules that look for certain characteristics.
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