首先载入目标,F9
003D042F 8918 MOV DWORD PTR DS:[EAX],EBX
---第一处异常
003D0431 EB 3C JMP SHORT 003D046F
003D0433 DF69 4E FILD QWORD PTR DS:[ECX+4E]
003D0436 58 POP EAX
003D0437
DF59 71 FISTP WORD PTR DS:[ECX+71]
003D043A F4
HLT
003D043B EB 01 JMP SHORT 003D043E
003D043D DF70 EF FBSTP TBYTE PTR DS:[EAX-11]
003D0440 DF51 EB FIST WORD PTR DS:[ECX-15]
003D0443
F4 HLT
003D0444 EB EB JMP
SHORT 003D0431
-----------------------------------------------------
按SHIFT+F9到这里
003D4C83 D975 F8 FSTENV (28-BYTE)
PTR SS:[EBP-8] ---第二处异常
003D4C86 2BC0 SUB
EAX,EAX
003D4C88 0FB74C16 06 MOVZX ECX,WORD PTR DS:[ESI+EDX+6]
003D4C8D C1E0 05 SHL EAX,5
003D4C90
C1E1 03 SHL ECX,3
003D4C93 8908
MOV DWORD PTR DS:[EAX],ECX
003D4C95 0FB74C16 14 MOVZX
ECX,WORD PTR DS:[ESI+EDX+14]
003D4C9A 03C1
ADD EAX,ECX
003D4C9C 83E8 10 SUB EAX,10
003D4C9F
03D0 ADD EDX,EAX
003D4CA1 8B4C16 0C
MOV ECX,DWORD PTR DS:[ESI+EDX+C]
---------------------------------------------------------
看一下ESP+4,并设断点,按SHIFT+F9
003D4D38 64:67:A1 0000 MOV
EAX,DWORD PTR FS:[0] ---在这里设断
003D4D3D 8B20
MOV ESP,DWORD PTR DS:[EAX]
003D4D3F 64:67:8F06
0000 POP DWORD PTR FS:[0]
003D4D45 E8 00000000
CALL 003D4D4A
003D4D4A 5D
POP EBP
003D4D4B 81ED 86AA4000 SUB EBP,40AA86
003D4D51 80BD 72CF4000 FF CMP BYTE PTR SS:[EBP+40CF72],FF
003D4D58 74 11 JE SHORT 003D4D6B
点右键里的seach for ..command
输入 jmp edx , Find
到这里
003D4D60 890C24 MOV DWORD PTR SS:[ESP],ECX
003D4D63 8B95 E1A44200 MOV EDX,DWORD PTR SS:[EBP+42A4E1]
003D4D69 FFE2 JMP EDX
---不是她
003D4D6B E8 00000000 CALL 003D4D70
003D4D70 5D
POP EBP
003D4D71 81ED ACAA4000 SUB EBP,40AAAC
003D4D77
EB 47 JMP SHORT 003D4DC0
003D4D79
DF69 4E FILD QWORD PTR DS:[ECX+4E]
点右键里的seach
for .. Next
到这里
003D5CE9 0D FD0A4369
OR EAX,69430AFD
003D5CEE EB F4
JMP SHORT 003D5CE4
003D5CF0 EB EB
JMP SHORT 003D5CDD
003D5CF2 EB 8C
JMP SHORT 003D5C80
003D5CF4 40
INC EAX
003D5CF5 FFE2
JMP EDX ---aha 设个断点,F9下车吧。
003D5CF7
EB 3A JMP SHORT 003D5D33
003D5CF9
DF69 4E FILD QWORD PTR DS:[ECX+4E]
003D5CFC
58 POP EAX
003D5CFD
DF59 72 FISTP WORD PTR DS:[ECX+72]
003D5D00
F4 HLT
003D5D01
EB 01 JMP SHORT 003D5D04
dump出来,下面就是重建Import
table
非常简单的^_^
- 标 题:用OLLYDBG跟踪Krypton v0.4加的壳 (2千字)
- 作 者:zczc
- 时 间:2002-11-5 20:38:39
- 链 接:http://bbs.pediy.com