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Install And Configure Yara


Step1:To Install YARA on Ubuntu we need the PCRE and some libraries first:
  sudo apt-get install libpcre3 libpcre3-dev 
Then we start downloading the YARA source code:
$ wget http://yara-project.googlecode.com/files/yara-1.4.tar.gz 
$ wget http://yara-project.googlecode.com/files/yara-python-1.4.tar.gz


Step2: Compile and install yara on your linux box.
 a) cd yara-1.4
    chmod +x -R /root/Desktop/yara-1.4/*
   ./configure
    make
    make check
    make install

 b)cd ..
    cd yara-python-1.4
    python setup.py install




Step 3: Convert clamav database to yara
http://code.google.com/p/malwarecookbook/source/browse/trunk/3/3/clamav_to_yara.py?r=5

sigtool -u /var/lib/clamav/main.cvd                                     //decompress the database
python clamav_to_yara.py -f main.ndb -o clamav.yara    //convert clamav to yara

Step 4:For packing signature(PEID tool uses these signature to detect type of packing) go to this site and copy packer signatures in a file .Now with the help of this file we can detect packed malware using  yara.
yara -r packersrule infected-file





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