Re: Sasser
From: Shenan Stanley (news_helper_at_hushmail.com)
Date: 05/03/04
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Date: Sun, 2 May 2004 19:13:08 -0500
Suzie wrote:
> Have the Sasser virus; am unable to figure out how to remove it.
> When I try to go to websites listed by Shenan Stanley in previous
> reponses -all I get is a blank page - am unable to refresh or reload.
> Can't access home page of norton.com, but then when try to download
> removal instructions for Sasser, just get a blank page/error message.
> How do I get this virus off my system? Thanks!
Can you get here:
http://www.microsoft.com/security/incident/sasser.asp
You could try to get the removal tool from Symantec for Sasser directly:
http://securityresponse.symantec.com/avcenter/FxSasser.exe
Or you could try removing it manually:
Manual Removal
The following instructions pertain to all current and recent Symantec
antivirus products, including the Symantec AntiVirus and Norton AntiVirus
product lines.
1. End the malicious process.
2. Disable System Restore (Windows Me/XP).
3. Update the virus definitions.
4. Run a full system scan and delete all the files detected as
W32.Sasser.Worm.
5. Reverse the change made to the registry.
For details on each of these steps, read the following instructions.
1. To end the malicious process
To end the malicious process:
a. Press Ctrl+Alt+Delete once.
b. Click Task Manager.
c. Click the Processes tab.
d. Double-click the Image Name column header to alphabetically sort
the processes.
e. Scroll through the list and look for the following processes:
- avserve.exe
- any process with a name consisting of 4 or 5 digits
followed by _up.exe (eg 74354_up.exe).
f. If you find any such process, click it, and then click End
Process.
g. Exit the Task Manager.
2. To disable System Restore (Windows Me/XP)
If you are running Windows Me or Windows XP, we recommend that you
temporarily turn off System Restore. Windows Me/XP uses this feature, which
is enabled by default, to restore the files on your computer in case they
become damaged. If a virus, worm, or Trojan infects a computer, System
Restore may back up the virus, worm, or Trojan on the computer.
Windows prevents outside programs, including antivirus programs, from
modifying System Restore. Therefore, antivirus programs or tools cannot
remove threats in the System Restore folder. As a result, System Restore has
the potential of restoring an infected file on your computer, even after you
have cleaned the infected files from all the other locations.
Also, a virus scan may detect a threat in the System Restore folder even
though you have removed the threat.
Windows XP:
1.. Click Start > Programs > Accessories > Windows Explorer
2.. Right-click My Computer, and then click Properties.
3.. Click the System Restore tab.
4.. Check the "Turn off System Restore" or "Turn off System Restore on all
drives" check box.
5.. Click Apply.
6.. This will delete all existing restore points. Click Yes to do this.
7.. Click OK.
8.. Proceed with what you need to do.
----------------------------------------------------------------------------
---- Note: When you are completely finished with the removal procedure and are satisfied that the threat has been removed, re-enable System Restore by following the instructions in reverse ---------------------------------------------------------------------------- ---- 3. To update the virus definitions Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions: Running LiveUpdate, which is the easiest way to obtain virus definitions: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the Virus Definitions (LiveUpdate). Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to the Virus Definitions (Intelligent Updater). The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions. 4. To scan for and delete the infected files Start your Symantec antivirus program and make sure that it is configured to scan all the files. For Norton AntiVirus consumer products: Read the document, "How to configure Norton AntiVirus to scan all files." Run a full system scan. If any files are detected as infected with W32.Sasser.Worm, click Delete. 5. To reverse the change made to the registry ---------------------------------------------------------------------------- ---- WARNING: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified keys only. Read the document, "How to make a backup of the Windows registry," for instructions. ---------------------------------------------------------------------------- ---- a. Click Start, and then click Run. (The Run dialog box appears.) b. Type regedit Then click OK. (The Registry Editor opens.) c. Navigate to the key: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run d. In the right pane, delete the value: "avserve.exe"="%Windir%\avserve.exe" e. Exit the Registry Editor. -- <- Shenan -> --
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