Class: Rex::PeScan::Analyze::Fingerprint

Inherits:
Object
  • Object
show all
Defined in:
lib/rex/pescan/analyze.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pe) ⇒ Fingerprint

Returns a new instance of Fingerprint.



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# File 'lib/rex/pescan/analyze.rb', line 11

def initialize(pe)
  self.pe = pe
end

Instance Attribute Details

#pe ⇒ Object

Returns the value of attribute pe.



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# File 'lib/rex/pescan/analyze.rb', line 9

def pe
  @pe
end

Instance Method Details

#config(param) ⇒ Object 



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# File 'lib/rex/pescan/analyze.rb', line 15

def config(param)
  @sigs = {}

  name = nil
  regx = ''
  epon = 0
  sidx = 0

  fd = File.open(param['database'], 'rb')
  fd.each_line do |line|
    case line
    when /^\s*#/
      next
    when /\[\s*(.*)\s*\]/
      if (name)
        @sigs[ name ] = [regx, epon]
      end
      name = $1 + " [#{ sidx+=1 }]"
      epon = 0
      next
    when /signature\s*=\s*(.*)/
      pat = $1.strip
      regx = ''
      pat.split(/\s+/).each do |c|
        next if c.length != 2
        regx << (c.index('?') ? '.' : "\\x#{c}")
      end
    when /ep_only\s*=\s*(.*)/
      epon = ($1 =~ /^T/i) ? 1 : 0
    end
  end

  if (name and ! @sigs[name])
    @sigs[ name ] = [regx, epon]
  end

  fd.close
end

#scan(param) ⇒ Object 



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# File 'lib/rex/pescan/analyze.rb', line 54

def scan(param)
  config(param)

  epa = pe.hdr.opt.AddressOfEntryPoint
  buf = pe.read_rva(epa, 256) || ""

  @sigs.each_pair do |name, data|
    begin
    if (buf.match(Regexp.new('^' + data[0], nil, 'n')))
      $stdout.puts param['file'] + ": " + name
    end
    rescue RegexpError
      $stderr.puts "Invalid signature: #{name} #{data[0]}"
    end
  end
end