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YARA is a tool aimed at helping malware researchers to identify and classify malware samples. With YARA you can create descriptions of malware families based on textual or binary patterns contained on samples of those families. Each description consists of a set of strings and a Boolean expression which determines its logic.
This is just a simple example, more complex and powerful rules can be created by using binary strings with wild-cards, case-insensitive text strings, special operators, regular expressions and many other features that you can 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.
Python users can also use yara-ctypes by Michael Dorman. He has also written a multi-threaded command-line YARA scanner based on yara-ctypes that can exploit the benefits of current multi-core CPUs when scanning big file collections.

Download Here :: Yara 1.7.tar.gz (for Linux)
                               Yara 1.7 win32.zip (for Windows)
Source :: http://code.google.com/p/yara-project/


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