1.9 KiB
Yara plugin
Preliminary documentation on yara can be found here: Yara User's Manual
The following is 'YARA in a nutshell' from this document:
YARA is a tool aimed at helping malware researchers to identify and classify malware families. With YARA you can create descriptions of malware families based on textual or binary information contained on samples of those families. These descriptions, a.k.a rules, consist patterns and a boolean expression which determines its logic. Rules can be applied to files or running processes in order to determine if it belongs to the described malware family.
Requirements
You can either install libyara with your prefered package manager, or you can execute sys/yara.sh in order to retrieve latest source, compile, and install the library.
Yara in radare2
radare2 provides several commands, allowing the user, to add or remove rules, scan a file, and list or use rules tags.
You can list the yara commands with the following r2 command yara3 [help].
Rules
By default, radare2 ships with some common crypto and packers rules that you
can find in /usr/local/share/radare2/last/yara/ if you installed it r2 or
radare2/shlr/yara/ in the git repo.
They are loaded as soon as you start using the yara plugin.
So you can issue yara scan and automatically see if your binary is packed
with a known packer.
Example
Load a rule file on the fly, and then scan the currently opened file:
yara add /home/name/rules/malware.rules
yara scan
Yara versions
Because radare2 has support for both yara versions currently,
depending from the version/plugin you've loaded, you need
to use the proper versioned command.
E.g. yara2 or yara3. For example yara3 scan.