此文只作为研究和学习使用,脱壳部分带过
研究版本6.8.0.2365 可能记错了研究出来有一段时间了。
73D34223 mfc42.#1636_CString::AssignCopy 8BFF mov edi, edi
73D34225 56 push esi
73D34226 57 push edi
73D34227 8B7C24 0C mov edi, dword ptr ss:[esp+C]
73D3422B 57 push edi
73D3422C 8BF1 mov esi, ecx
73D3422E E8 24000000 call mfc42.#1584_CString::AllocBefore>
73D34233 57 push edi
73D34234 FF7424 14 push dword ptr ss:[esp+14]
73D34238 FF36 push dword ptr ds:[esi]
73D3423A E8 BFE4FFFF call <jmp.&msvcrt.memcpy>
73D3423F 8B06 mov eax, dword ptr ds:[esi]
73D34241 8978 F8 mov dword ptr ds:[eax-8], edi
73D34244 8B06 mov eax, dword ptr ds:[esi]
73D34246 83C4 0C add esp, 0C
73D34249 C60407 00 mov byte ptr ds:[edi+eax], 0
73D3424D 5F pop edi
73D3424E 5E pop esi
73D3424F C2 0800 retn 8
所有的版本这里找到脚本拷贝地址
73D3423F 8B06 mov eax, dword ptr ds:[esi]
条件为[eax]==0x206d6944 || [eax]==0x206d6964
当读取脚本Dim和dim 时断下来
可以逐步跟踪找到脚本代码.
过程:
程序脱壳以后,载入od，在73D3423F下断点条件是当读取脚本Dim和dim声明变量的时候断下。
停下来以后alt+f9返回到用户代码
004264B9 E8 1C21FFFF call <jmp.&mfc42.#860_CString::operator=>
004264BE 68 DC0B4800 push 脱壳可运.00480BDC
004264C3 8D4D BC lea ecx, dword ptr ss:[ebp-44]
004264C6 E8 0F21FFFF call <jmp.&mfc42.#860_CString::operator=>
004264CB 8B45 C0 mov eax, dword ptr ss:[ebp-40]
004264CE 8B40 F8 mov eax, dword ptr ds:[eax-8]
004264D1 8D4C07 01 lea ecx, dword ptr ds:[edi+eax+1]
004264D5 8B46 14 mov eax, dword ptr ds:[esi+14]
004264D8 8B7E 0C mov edi, dword ptr ds:[esi+C]
单步走.4264c6这里还会进来一次。alt+f9返回。
到4264d5 d ecx,就看到脚本缓冲区了。全部抓出来保存。待后修复。
我这里的脚本片段:
00F38093 44 69 6D 20 66 69 72 73 74 72 75 Dim firstru
00F380A3 6E 00 52 75 6E 4E 46 00 68 77 6E 64 3D 57 69 6E n.RunNF.hwnd=Win
00F380B3 64 6F 77 2E 46 69 6E 64 28 22 4E 6F 74 65 70 61 dow.Find("Notepa
00F380C3 64 22 2C 30 29 00 68 77 6E 64 20 3D 20 30 00 52 d",0).hwnd = 0.R
00F380D3 75 6E 41 70 70 28 22 6E 6F 74 65 70 61 64 2E 65 unApp("notepad.e
00F380E3 78 65 22 29 00 35 30 30 30 00 31 30 30 2C 32 30 xe").5000.100,20
00F380F3 30 20 20 2F 2F 62 75 74 74 6F 6E 00 31 00 35 30 0 //button.1.50
00F38103 30 30 00 31 30 30 2C 32 30 30 20 2F 2F 61 67 72 00.100,200 //agr
00F38113 65 65 00 37 34 2C 31 00 36 35 2C 31 00 36 38 2C ee.74,1.65,1.68,
00F38123 31 00 36 39 2C 31 00 37 37 2C 31 00 36 35 2C 31 1.69,1.77,1.65,1
00F38133 00 37 33 2C 31 00 37 36 2C 31 00 39 2C 31 20 20 .73,1.76,1.9,1
00F38143 2F 2F 74 61 62 00 38 37 2C 31 00 36 35 2C 31 00 //tab.87,1.65,1.
接下来找操作码地址。
抓出来脚本以后。f9让程序正常运行。
下断 hr ZwProtectVirtualMemory
出现界面以后。按指定的热键激活脚本。
连续断下。每次按alt+f9
看到类似如下代码返回处
0043D4BE E8 7D92FEFF call 脱壳可运.00426740
0043D4C3 83C4 08 add esp, 8
0043D4C6 C745 D0 010000>mov dword ptr ss:[ebp-30], 1
0043D4CD E8 3EBBFEFF call 脱壳可运.00429010
0043D4D2 8BC8 mov ecx, eax
0043D4D4 E8 07BCFEFF call 脱壳可运.004290E0
0043D4D9 8B4B 04 mov ecx, dword ptr ds:[ebx+4]
0043D4DC 8B040E mov eax, dword ptr ds:[esi+ecx]
0043D4DF 8D3C0E lea edi, dword ptr ds:[esi+ecx]
单步到
0043D4DC 8B040E mov eax, dword ptr ds:[esi+ecx]
d ecx为指令缓冲区.
00F2D784 4C 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 L...............
00F2D794 00 00 00 00 00 00 00 00 D4 86 E0 73 50 45 AD 00 ........詥鄐PE?
00F2D7A4 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
00F2D7B4 00 00 00 00 00 00 00 00 D4 86 E0 73 00 45 AD 00 ........詥鄐.E?
00F2D7C4 48 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 H...............
00F2D7D4 00 00 00 00 00 00 00 00 D4 86 E0 73 80 42 AD 00 ........詥鄐€B?
00F2D7E4 36 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 6...............
00F2D7F4 00 00 00 00 00 00 00 00 D4 86 E0 73 40 46 AD 00 ........詥鄐@F?
00F2D804 47 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 G...............
00F2D814 00 00 00 00 00 00 00 00 D4 86 E0 73 F0 45 AD 00 ........詥鄐餎?
00F2D824 30 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0...............
00F2D834 00 00 00 00 00 00 00 00 D4 86 E0 73 A0 45 AD 00 ........詥鄐燛?
00F2D844 21 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 !...............
00F2D854 00 00 00 00 00 00 00 00 D4 86 E0 73 30 47 AD 00 ........詥鄐0G?
00F2D864 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00F2D874 00 00 00 00 00 00 00 00 D4 86 E0 73 E0 46 AD 00 ........詥鄐郌?
00F2D884 30 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0...............
00F2D894 00 00 00 00 00 00 00 00 D4 86 E0 73 90 46 AD 00 ........詥鄐怓?
00F2D8A4 21 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 !...............
每条指令信息长度为0x20
对应的指令表
脚本对应
44 69 6D 20 66 69 72 73 74 72 75 6E 00
Dim firstrun.
最后的00标识一个被加密的指令.要对应如上的指令表查找
第一个4c指令对应脚本空格,脚本中第一个00对应指令表里第二个指令34，以此类推。部分脚本破译
Dim firstrun
Sub RunNF
Plugin hwnd=Window.Find("Notepad",0)
If hwnd = 0
VBSCall RunApp("notepad.exe")
Delay 5000
MoveTo 100,200 //button
LeftClick 1
Delay 5000
MoveTo 100,200 //agree
KeyPressS 74,1
KeyPressS 65,1
KeyPressS 68,1
KeyPressS 69,1
KeyPressS 77,1
以下是我定义的部分操作码和对应的脚本符号
code0=00
codename0=KeyPress
code1=06
codename1=KeyPressS
code2=03
codename2=KeyPressH
code3=01
codename3=KeyDown
code4=02
codename4=KeyUp
code5=09
codename5=LeftClick
code6=21
codename6=MoveTo
code7=22
codename7=MoveR
code8=23
codename8=MouseWheel
code9=29
codename9=RestoreMousePos
code10=2A
codename10=LockMouse
code11=2B
codename11=UnlockMouse
code12=2E
codename12=WaitClick
code13=2C
codename13=WaitKey
code14=2D
codename14=GetLastKey
code15=2F
codename15=GetLastClick
code16=37
codename16=IfColor
code17=3A
codename17=EndIf
code18=3C
codename18=For
code19=3E
codename19=EndFor
code20=36
codename20=If
code21=3F
codename21=Goto
code22=40
codename22=Gosub
code23=35
codename23=Rem
code24=34
codename24=Sub
code25=41
codename25=Return
code26=30
codename26=Delay
code27=33
codename27=SayString
code28=31
codename28=MessageBox
code29=49
codename29=UserVar
code30=46
codename30=VBS
code31=4A
;Plugin
codename31=
code32=4C
;//
codename32=
code33=39
codename33=Elseif
code34=42
codename34=EndScript
code35=48
codename35=Plugin
code36=3B
codename36=While
code37=38
codename37=Else
还有很多没有时间研究。有兴趣的朋友继续深入吧。
而且精灵还要靠这个挣钱。写到这里吧
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