Restore the MsnMessenger password from the registry

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Demonstrates the MSNMessenger password from the registry

Author:

Tombkeeper (T0MBKEEPER_AT_HOTMAIL.COM)

/ * MsnMessenger's password is saved in the registry after DPAPI encryption

* This program demonstrates the decoding process

* Tombkeeper [0x40] nsfocus [0x2e] COM

* Tombkeeper [0x40] xfocus [0x2e] net

* 2004.08.11

* /

#include

#pragma comment (Lib, "Advapi32.lib")

#define fchk (a) IF (! (a)) {Printf (#a "failed / n"); return 0;}

TypedEf struct _cryptoAPi_blob {

DWORD CBDATA;

BYTE * PBDATA;

} DATA_BLOB;

Typedef struct_pryptprotect_promptstruct {

DWORD CBSIZE;

DWORD DWPROMPTFLAGS;

HWND HWNDAPP;

LPCWSTR SZPROMPT;

} Cryptprotect_promptstruct, * pcryptprotect_promptstruct;

Typedef Bool (WinApi * PcryptunprotectData)

Data_blob * pdatain,

LPWSTR * PPSZDATADESCR,

Data_blob * POPTIONALENTROPY,

PVOID PVRESERVED,

Cryptprotect_PromptStruct * Ppromptstruct,

DWORD DWFLAGS,

Data_blob * pdataout

);

PcryptunProtectData CryptunprotectData = NULL;

Int main (void)

{

int R;

HModule HNTDLL;

HKEY HKEY;

DWORD DWTYPE;

Char Data [0x100] = {0};

DWORD DWSIZE;

Data_blob datain;

Data_blob dataout;

Ret = regopenkeyex

(

HKEY_CURRENT_USER,

"Software // Microsoft // MsnMessenger",

0,

Key_Read,

& HKey

);

IF (RET! = Error_Success) Return 1;

Ret = RegQueryValueex

(

HKEY,

"Password.Net Messenger Service",

NULL,

& dwtype,

Data,

& dwsize

);

IF (RET! = Error_Success) Return 1;

FCHK ((hnts = loadinglibrary ("crypt32.dll"))! = Null);

FCHK ((CryptunprotectData = (PcryptunprotectData)

GetProcaddress (HNTDLL, "CRYPTUNPROTECTDATA")! = Null);

Datain.pbdata = DATA 2; // 口 密 文 From the second position

Datain.cbdata = dwsize-2;

CryptunprotectData

& Datain,

NULL,

NULL,

NULL,

NULL,

1,

& Dataout

);

Base64_Decode (DataOut.pbdata, Data, Strlen (DataOut.pbdata));

Printf ("MSN Password:% S / N", DATA);

Return 0;

}

// Copied from GNU Libc - Libc / Resolv / Base64.c

Int base64_decode (char const * src, char * target, size_t targsize)

{

STATIC const char base64 [] =

"Abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789 /";

Static const char PAD64 = '=';

Int Tarindex, State, CH;

Char * pos;

STATE = 0;

TARINDEX = 0;

While ((ch = * src )! = '/ 0')

{

IF (Isspace (CH)) / * Skip Whitespace Anywhere. * /

CONTINUE;

IF (CH == PAD64)

Break;

POS = Strchr (Base64, CH);

IF (POS == 0) / * a non-base64 character. * /

Return (-1);

Switch (state)

{

Case 0:

IF (Target)

{

IF ((size_t) Tarindex> = targsize)

Return (-1);

Target [tarindex] = (POS - Base64) << 2;

}

State = 1;

Break;

Case 1:

IF (Target)

{

IF ((size_t) Tarindex 1> = targsize)

Return (-1);

Target [tarindex] | = (POS - BASE64) >> 4;

Target [tarindex 1] = ((POS - Base64) & 0x0f) << 4;

}

TARINDEX ;

STATE = 2;

Break;

Case 2:

IF (Target)

{

IF ((size_t) Tarindex 1> = targsize)

Return (-1);

Target [tarindex] | = (POS - BASE64) >> 2;

Target [tarindex 1] = ((POS - Base64) & 0x03) << 6;

}

TARINDEX ;

State = 3;

Break;

Case 3:

IF (Target)

{

IF ((size_t) Tarindex> = targsize)

Return (-1);

Target [tarindex] | = (POS - base64);

}

TARINDEX ;

STATE = 0;

Break;

DEFAULT:

Abort ();

}

}

/ *

* WE Are Done Decoding Base-64 Chars. Let's See if We end * on a byte boundary, and / or with erroneous trailing character.

* /

IF (CH == PAD64)

{/ * We got a pad char. * /

CH = * SRC ; / * Skip it, get next. * /

Switch (state)

{

Case 0: / * invalid = in first position * /

Case 1: / * invalid = in second position * /

Return (-1);

Case 2: / * valid, means one byte of info * /

/ * SKIP Any Number of Spaces. * /

For ((void) null; ch! = '/ 0'; CH = * src )

IF (! Isspace (CH))

Break;

/ * Make Sure there is another trailing = sign. * /

IF (ch! = pad64)

Return (-1);

CH = * SRC ; / * Skip the = * /

/ * Fall Through To "Single Trailing =" CASE. * /

/ * Fallthrough * /

Case 3: / * valid, means two bytes of info * /

/ *

* We know this char is an =. Is there anything but

* Whitespace After IT?

* /

For ((void) null; ch! = '/ 0'; CH = * src )

IF (! Isspace (CH))

Return (-1);

/ *

* Now make Sure for Cases 2 and 3 That The "extra"

* Bits That Slopped Past The Last Full Byte Were

* Zeros. if we don't check theme, They Become A

* Subliminal Channel.

* /

IF (Target && Target [TARINDEX]! = 0)

Return (-1);

}

}

Else

{

/ *

* WE ended by seeing the end of the string. Make Sure WE

* Have no partial bytes lying arround.

* /

IF (State! = 0)

Return (-1);

}

Return (TarIndex);

}

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