RE: [Full-disclosure] WGA patch for LegitCheckControl.dll

["Debasis Mohanty" <mail@xxxxxxxxxxxxxxxxxx>]

Mohr, 

I am not too sure if this is yet another "WGA LegitCheckControl.dll patch"
around but a similar patch was sent to me by its author called "LanTHruster"
on 28th July, 2005. Check the attachment. 

Patch details
=================================================
This patch completely deactivates WGA control 
(will even remove dhtml NAGs)

- Close all the copies of IE
- Either copy this patch in system32 folder or select LegitCheckControl.dll
file
   i.e. C:\WINDOWS\system32\LegitCheckControl.dll
- Apply patch
- Run Windows Update web service to see if WGA is absent, no reboot required
- Enjoy

If Windows update is not working for you anymore telling you that you have
an illegal XP copy then this patch if for you. 

Tested under XP Pro Eng Sp2
=================================================

- D

-----Original Message-----
From: full-disclosure-bounces@xxxxxxxxxxxxxxxxx
[mailto:full-disclosure-bounces@xxxxxxxxxxxxxxxxx] On Behalf Of M. Mohr
Sent: Thursday, August 11, 2005 8:06 AM
To: bugtraq
Cc: full-disclosure
Subject: [Full-disclosure] WGA patch for LegitCheckControl.dll

I'm not sure this got through the first time, so I'll resend it.  Sorry if
there is a dupe.

/*
  Name: Windows Genuine Advantage Validation Patch
  Copyright: NeoSecurityTeam
  Author: HaCkZaTaN <hck_zatan@xxxxxxxxxxx>
  Date: 31/07/05 21:42
  Description: LegitCheckControl.dll (1.3.254.0)

  [N]eo [S]ecurity [T]eam [NST]® - http://www.neosecurityteam.net/
  Irc.GigaChat.Net #uruguay

  ----------------------------------------------------------------

  Code cleanup and input validation by Arashi
  Original code from:
 
http://dkcs.void.ru/index.php?module=exploits&FullArticle=exploits/380

*/

#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>

typedef struct bytepair BYTEPAIR;

struct bytepair
{
  long offset;
  unsigned char old;
  unsigned char new;
};

static const BYTEPAIR byte_pairs[3]= {
  {0x2BE98, 0x8B, 0x33},
  {0x2BE99, 0x45, 0xC0},
  {0x2BE9A, 0xD8, 0x90},
};

int main() {
  unsigned short i;
  int LegitCheckControl;
  unsigned char check, ver[10];

  printf("\n\n\n\nLegitCheckControl.dll 1.3.254.0 WGA validation patch.\n\n"
         "Code cleanup and validation by Arashi\n"
         "Author: HaCkZaTaN <hck_zatan@xxxxxxxxxxx>\n"
         "®[N]eo [S]ecurity [T]eam [NST]\n"
         "  - http://www.neosecurityteam.net/\n";
         "  - Irc.GigaChat.Net #uruguay\n\n"
         "-----------------------------------------------------\n\n");

  printf("Verifying LegitCheckControl.dll...\n");

  LegitCheckControl = open("LegitCheckControl.dll", O_RDWR);

  if (LegitCheckControl == -1) {
    perror("LegitCheckControl.dll");
    return 1;
  }
  else printf("  * LegitCheckControl.dll opened succesfully.\n");

  if((lseek(LegitCheckControl,0xD2A0,SEEK_SET) == -1)) {
    perror("  ! lseek");
    return 1;
  }
  if((read(LegitCheckControl,&ver,10) != 10)) {
    perror("  ! read");
    return 1;
  }
  if(strncmp(ver, "1.3.0254.0", 10)) {
    fprintf(stderr, "  ! Invalid version information\n\nAborted.\n");
    return 1;
  }
  else printf("  * Version information is confirmed.\n");

  for(i=0;i<3;i++) {
    if((lseek(LegitCheckControl, byte_pairs[i].offset,
SEEK_SET) == -1)) {
      perror("  ! lseek");
      return 1;
    }
    if((read(LegitCheckControl,&check,1) != 1)) {
      perror("  ! read");
      return 1;
    }

    if(check != byte_pairs[i].old) {
      fprintf(stderr, "  ! Unable to verify patch bytes.\n\nAborted.\n");
      return 1;
    }
  }

  printf("  * LegitCheckControl.dll validated.\n\nApplying patch...\n");

  for(i=0;i<3;i++) {
    if((lseek(LegitCheckControl, byte_pairs[i].offset,
SEEK_SET) == -1)) {
      perror("  ! lseek");
      return 1;
    }
    if((write(LegitCheckControl, &byte_pairs[i].new, 1) != 1)) {
      perror("  ! write");
      return 1;
    }
  }

  close(LegitCheckControl);

  printf("Patch complete.\n\n\n");

  return 0;
}


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Attachment: WGAPatch.bmp
Description: Windows bitmap

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Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/