Add new yara doc
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Yara plugin
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===========
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Preliminary documentation on yara can be found here:
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[Yara User's Manual](https://b161268c3bf5a87bc67309e7c870820f5f39f672.googledrive.com/host/0BznOMqZ9f3VUek8yN3VvSGdhRFU/YARA-Manual.pdf)
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The following is 'YARA in a nutshell' from this document:
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> YARA is a tool aimed at helping malware researchers to identify and classify malware
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families. With YARA you can create descriptions of malware families based on textual or
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binary information contained on samples of those families. These descriptions, a.k.a rules,
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consist patterns and a boolean expression which determines its
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logic. Rules can be
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applied to files or running processes in order to determine if it belongs to the described
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malware family.
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Yara in radare2
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----------
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radare2 provides several commands, allowing the user, to add or remove rules,
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scan a file, and list or use rules tags.
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You can list the yara commands with the following r2 command `yara [help]`.
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Example
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-------
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Load a rule file on the fly, and then scan the currently opened file:
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yara add /home/name/rules/malware.rules
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yara scan
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