lib/rcs-common/evidence/keylog.rb
# encoding: utf-8
require 'rcs-common/trace'
require 'rcs-common/evidence/common'
module RCS
module KeylogEvidence
extend RCS::Tracer
ELEM_DELIMITER = 0xABADC0DE
KEYSTROKES = ["привет мир", "こんにちは世界", "Hello world!", "Ciao mondo!"]
def content
proc_name = ["ruby", "python", "go", "javascript", "c++", "java"].sample.to_utf16le_binary_null
window_name = ["Ruby Backdoor!", "Python Backdoor!", "Go Backdoor!", "Javascript Backdoor!", "C++ Backdoor!", "Java Backdoor!"].sample.to_utf16le_binary_null
content = StringIO.new
t = Time.now.getutc
content.write [t.sec, t.min, t.hour, t.mday, t.mon, t.year, t.wday, t.yday, t.isdst ? 0 : 1].pack('l*')
content.write proc_name
content.write window_name
content.write [ ELEM_DELIMITER ].pack('L')
keystrokes = KEYSTROKES.sample.to_utf16le_binary_null
content.write keystrokes
content.string
end
def generate_content
ret = Array.new
# insert first two bytes to null terminate the string
ret << [0].pack('S') + content()
10.rand_times { ret << content() }
ret
end
def decode_content(common_info, chunks)
stream = StringIO.new chunks.join
stream.read 2 # first 2 bytes of null termination (Naga weirdness ...)
until stream.eof?
tm = stream.read 36
timestamp = tm.unpack('l*')
#puts "STREAM POS #{stream.pos} SIZE #{stream.size}"
#puts "TIMESTAMP #{timestamp.inspect} OBJECT_ID #{self.object_id}"
info = Hash[common_info]
info[:da] = Time.gm(*timestamp, 0)
info[:data] = Hash.new if info[:data].nil?
info[:data][:program] = ''
info[:data][:window] = ''
info[:data][:content] = ''
process_name = stream.read_utf16le_string
#trace :debug, "PROGRAM NAME UTF-16LE #{process_name}"
info[:data][:program] = process_name.utf16le_to_utf8 unless process_name.nil?
#trace :debug, "PROGRAM NAME UTF-8 #{info[:data][:program]}"
window_name = stream.read_utf16le_string
info[:data][:window] = window_name.utf16le_to_utf8 unless window_name.nil?
#trace :debug, "WINDOW NAME #{info[:data][:window]}"
delim = stream.read(4).unpack("L*").first
raise EvidenceDeserializeError.new("Malformed KEYLOG (missing delimiter)") unless delim == ELEM_DELIMITER
#trace :debug, "DELIM #{delim.to_s(16)}"
keystrokes = stream.read_utf16le_string
#trace :debug, "KEYSTROKES UTF-16LE #{keystrokes}"
info[:data][:content] = keystrokes.utf16le_to_utf8 unless keystrokes.nil?
#trace :debug, "KEYSTROKES UTF-8 #{info[:data][:content]}"
yield info if block_given?
end
:delete_raw
end
end
end # ::RCS