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  • Submitted: Jun 01 2013 01:09 PM
  • Last Updated: Jun 01 2013 01:13 PM
  • File Size: 77.85KB
  • Views: 13700
  • Downloads: 2002
  • Approved by: Nuno Brito
  • Approved on: 03 June 2013 - 09:35 PM

Download PassPass 1.0

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grub4dos password script



Screenshots
Meet PassPass (Bypass the Password), a nifty Grub4DOS batch script to disable/re-enable Windows logon password validation. Credit (as well as dis-credit) is to be equally shared between Wonko the Sane and Holmes.Sherlock for the idea and coding respectively. We appreciate any success/failure report mentioning the following:
  • Windows version (e.g. XP, Vista, 7)
  • Architecture (e.g. 32-bit/64-bit)
  • msv1_0.dll version (e.g. 6.1.7600.16525) along with MD5 checksum, if possible

Technical details: The script tries to locate all existing Windows installations and corresponding Windows editions as well. Thereafter, it replaces the CMP instruction responsible for password verification with a 'benign' sequence of bytes. For reverting back the changes, the process is just the opposite. The whole idea is derived from WindowsGate and Astr0baby's tutorial.

Usage:
  • Install Grub4DOS. You may prefer using RMPrepUSB. Script tested with Grub4DOS v0.4.5c-2013-03-03.
  • Download grubutils and copy WENV binary on the root of the boot media. Script tested with grubutils-2011-06-27.
  • Copy PassPass.g4b and menu.lst on the root of the boot volume.
  • Boot
  • Ideally 'Autodetect' mode should be able to list out all existing Windows installation. For buggy BIOS-es, try appropriate <Disk#> and <Partition#> to 'Forcedetect' Windows installations.
  • Choose either 'Patch' or 'Unpatch' respectively for disabling/re-enabling password verification.
  • Reboot and boot into target Windows.
Credits:
  • Wonko the sane - For ideas, code snippets, information. The script embeds his DLL version detection script.
  • Ectomorph a.k.a. Damian Bakowski - For his 'unannounced' patch for 32-bit version of msv1_0.dll.
  • Astr0baby - For his reversing tutorial

What's New in Version 1.0 (See full changelog)

  • Initial release


Screenshots

Screenshots


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