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I hate to beat a dead horse, but I have had a similar problem. Through some fluke event one of the modules I was working on got saved over the master perl script for the program. Of course, I didn't notice this until after I tried to pull the code out of my source-safe database. Anyway, I have compiled it using PerlApp 4.1.2. I attempted to decompile it using the scripts provided in this node, but I was unsuccessfull. Obviously, I'm missing some key component. I tried varying the key string since I'm sure the copyright strings has changed since this query was first posted. I tried several different keystrings and all result in the keystring being repeated with some differences in some of the characters. Help would be most greatly appreciated. I will append the code that I'm using to try and decrypt the exe. The file being read is simply the PerlApp binary.
#!/usr/bin/perl open(FILE, "Z:\\test\\ftp\\dlclient\\NEFTPClient-1.6.exe"); # Read every line in the file my $filestring; binmode(FILE); binmode(STDOUT); while (<FILE>) { $filestring .= $_; } close FILE; my @encoded = split //, $filestring; # Our decode string #my @decode = (67,111,112,121,114,105,103,104,116,32,169,32,50,48,48,5 +0,32,65,99,116,105,118,101,83,116,97,116,101,32,84,111,111,108,32,67, +111,114,112,46); #my $key = 'Copyright 2000 ActiveState Tool Corp.'; my $key = 'Copyright ActiveState Corp 2001-2002.'; #my $key = 'Copyright 2002 ActiveState Tool Corp.'; #my $key = 'Copyright (C) 2002 NewsEdge Corp'; #my $key = ' '; my @keystring = split //, $key; foreach my $num (@keystring) { push @decode, ord($num); } print "@decode\n\n@encodedstring\n"; # Our unecoded string my @unencoded; for my $char (@encoded){ # XOR the encoded string with the decode character push @unencoded, ($char ^ $decode[0]); # Rotate the decode string push @decode, shift @decode; } for my $char (@unencoded){ if ($char == 10){ # Print a newline if the charater is 10 print "\n"; } else { # Print out the unencoded string #print chr($char); print chr($char); } }

In reply to RE: A real challenge by Anonymous Monk
in thread A real challenge by tachyon

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