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Installing yara on CentOS and test with Ruby script

1. install ruby, gems and pcre
yum install ruby ruby-devel rubygems pcre pcre-devel -y

2. download yara and install
wget http://yara-project.googlecode.com/files/yara-1.6.tar.gz
tar -xvf yara-1.6.tar.gz
cd yara-1.6
./configure
make
make install

3. install yara-ruby
gem install yara

4. test with a yara test script
vi sample.txt
------------------8<--------------------
aaa
bbb
ccc
------------------8<--------------------

vi yara_test.rb
#!/usr/bin/env ruby

require 'rubygems'
require 'yara'

rules = <<EOF
    rule rule_a
    {
      strings:
        $a = "aaa"
      condition:
        $a
    }
    rule rule_b
    {
      strings:
        $a = "bbb"
      condition:
        $a
    }
EOF

ctx = Yara::Rules.new
ctx.compile_string rules
ARGV.each do |fname|
  ctx.scan_file(fname).each {|match| puts ">> #{fname} matched #{match.rule} rule" }
end


$ ruby ./yara_test.rb a.txt 
>> a.txt matched rule_a rule
>> a.txt matched rule_b rule

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