imautopilot
April 23rd, 2009, 08:08
I think this is a decryptor routine. Sorry, i'm newbie here 
anybody can tell me the algorithm?
anybody can tell me the algorithm?
Code:
00403164 66:AD LODS WORD PTR DS:[ESI]
00403166 51 PUSH ECX
00403167 DB0424 FILD DWORD PTR SS:[ESP]
0040316A 90 NOP
0040316B 90 NOP
0040316C DA8D 7D104000 FIMUL DWORD PTR SS:[EBP+40107D]
00403172 90 NOP
00403173 DB1C24 FISTP DWORD PTR SS:[ESP]
00403176 D1E1 SHL ECX,1
00403178 90 NOP
00403179 90 NOP
0040317A 290C24 SUB DWORD PTR SS:[ESP],ECX
0040317D 330424 XOR EAX,DWORD PTR SS:[ESP]
00403180 90 NOP
00403181 D1E9 SHR ECX,1
00403183 90 NOP
00403184 66:AB STOS WORD PTR ES:[EDI]
00403186 58 POP EAX
00403187 49 DEC ECX
00403188 8BC1 MOV EAX,ECX
0040318A 74 02 JE SHORT 0040318E
0040318C ^ EB D6 JMP SHORT 00403164