Thursday, April 20, 2017

Plarium part two. Working with swf

Flash is old but still usable. 

Flash is very old  but still  usable. Few year ago I was sure that this product be killed by WebGL or other modern technology. Now Flash is alive and  very popular for some application.  Flash  contains not only sprites and images ,  actionscript code is also included in swf file. By running  this code flsdh has ability to  work with  user control and send command via network. 

Start JPEXS Free Decompiler  and open previous downloaded swf file. Navigate to script section:
  Unfortunately my Imac has problem with text searhing(searching is stopped with 'out of memory' error). In this case I'm looking  for potential file using personal meaning. File which has "sign-code" reference is placed at next path: scripts-> model-> logic->server->commands->JsonCallCmd
Function name is call() and contain  another one fuction generateRequestSignature(data,paramTextForSignatureCalculation) where  data are data which are send to server and paramTextForSignatureCalculation is sum of wellknown string started from "The Matrix" , method, userid , and usersocailauthkey.  Last three strings are also added to HTTP Header. 
you can verify this investigation by python interpretator:
python
Python 2.7.10 (default, Oct 13 2015, 09:42:49) 
[GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.72)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import hashlib
>>> matrix_string = "The Matrix has you..."
>>> http_data= """{"s":{"s":true,"o":1,"l":true,"f":true,"c":"en-US","p":0,"m":true,"z":0.6361773255813953,"g":false,"a":true},"u":1492615673749,"r":77,"o":{"i":44,"b":null},"y":[518],"sm":[],"km":9,"g":21193,"t":1492615694942,"q":[64,1,44,55,56,57,58,59,60,61,62,63]}"""
>>> http_command="CloseQuest"
>>> authkey='secretkey'
>>> userid='itsasecret'
>>> print hashlib.md5((matrix_string+http_data+http_command+userid+authkey).encode('ascii')).hexdigest()
8917c927db57bf6d7dbcb7a72b25151d
If you have received the same value as in http header then you have done your job well.

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