clean_virus.rb

#! /usr/bin/env ruby
require 'find'

PATTERN = Regexp.new '(\r\n\r\n)?<script>[^\n]+</script>\n<!--[a-f0-9]{32}-->'

def kill_virus(dir)
  Find.find(dir) do |path|
    if File.file?(path)
      text = File.read(path)
      if text =~ PATTERN
        text.gsub! PATTERN, ''
        File.open(path, 'w') { |f| f.write(text); puts "cleaned: #{path}" }
      end
    end
  end  
end

ARGV.each do |a|
  if File.directory? a
    kill_virus(a)
  else
    puts "Not a directory: #{a}"
  end
end