Big problem, I renamed lsass.exe to lsassf.exe...

  • woodc
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Post 3+ Months Ago

Is there any possible way to fix this, I searched the forums and found a few posts about it but nothing on how to fix it. im farley new here 8)

I renamed lsass.exe to lsassf.exe (thinking it would stop the sasser virus becuse i couldnt get to the net to download the fix) :oops:

windows xp pro sp1, NTFS hd format

i dont know very much about booting or dos so if you could help me out thad be great.

EDIT:

the file is located c:/windows/system32/lsass.exe its a critical login file or something im not completly sure anyways when i boot up... jus before the login screen it turns back with my mouse and stays there

cant boot up in safe mode or any other F8 option.
  • Anonymous
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Post 3+ Months Ago

  • SecureITGroup
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Post 3+ Months Ago

Where was this file that you renamed it. And what errors do you get or what happens after renameing it?
  • woodc
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Post 3+ Months Ago

my dads gonna kill me :cry:
  • ATNO/TW
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Post 3+ Months Ago

The only thing I can think of is if you are networked with another computer that can still access the file. Chances are slim, but if you can pull it up on the other computer and rename it back to what it should be, you'll be in like flint. Otherwise your dad is probably going to kill you, and you'll probably have to reinstall everything again.
  • JrzyCrim
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Post 3+ Months Ago

Where is Window's file protection when you need it? :)

This won't be hard to fix. You are going to have to use the recovery console. Basically a command prompt.

Follow the instructions at this site:
http://www.wown.com/j_helmig/wxprcons.htm

Once at the command prompt, type these commands:

Code: [ Select ]
cd system32

ren lsassf.exe lsass.exe

exit
  1. cd system32
  2. ren lsassf.exe lsass.exe
  3. exit


It should reboot with no troubles.

Good luck

Edit: You'll need your original XP CD (not a oem restore disk). Don't worry about the instructions on that page which follow entering your admin password. Once you are at the command prompt, you should see

C:\Windows

Just enter the above commands from this prompt.
  • woodc
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Post 3+ Months Ago

oh, thanks anyway

are you sure i cant go into DOS and type this is c:

ren c:/windows/system32/lsassf.exe c:/windows/system32/lsass.exe
or
copy c:/windows/system32/lsassf.exe c:/windows/system32/lsass.exe

im jus having a bit of trouble getting to dos with this NTFS thing
  • JrzyCrim
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Post 3+ Months Ago

If you can't boot into safe mood, then the only option is the recovery console or ATNO's method. Do you have the original XP installation disk handy?

Dos will avail you nothing as it will not recognize NTFS partitions.
  • woodc
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Post 3+ Months Ago

ill try that *hopes it works*

EDIT:

can i do the recovery console with the winxp boot disks?
if i cant get a hold of a 'legal' copy of winxp is it possible to make a repair installtion?

Thanks for the help guys jus gotta stall my dad a few more days not to go on the computer! :)
  • JrzyCrim
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Post 3+ Months Ago

This might help you out.

http://www.lpacomputers.telinco.co.uk/UBD.ZIP

Download this file, unzip it to a folder, put a blank floppy in the drive, and run MakeUBD.bat. This will write an image to the floppy disk with which you can boot up your 'sick' computer. Apparently, it contains utilities with which you can access NTFS partitions. Go through the readme.txt and be careful. I haven't really fooled around with this so I'm not sure how well it will work. Give it a try and see if you can rename that file.

Edit: Well, I tried it out. It's a pretty slick setup actually. The only problem is I couldn't rename any files on NTFS partitions. I guess you can't do any type of write operations. I could read and copy things from ntfs, just not the other way around. Unless I missed something.

Again, please be careful with that boot disk if you decide to try it out. Do not run any of those l*.bat files. (lren.bat, lcopy.bat, etc), Those commands are for working with linux partitions and may damage NTFS partitions.

You might try a google search for dos NTFS utilities and the like.
  • JrzyCrim
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Post 3+ Months Ago

You still alive? :lol:
  • woodc
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Post 3+ Months Ago

Wahoooo FIXed! :D

thanks for everys help i after trying mostly all your suggestions jrzy mostly.

i tryed that boot disk but as you said can't rename

i ended up downloading the boot disk creation (6dsks) then did a repair of windows (without the legal copy)

thanks every1
  • JrzyCrim
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Post 3+ Months Ago

Great! :) I'm glad you are here to tell us about it. It's amazing that something as small as a misnamed file can be such a headache.

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