Discovered: June 17, 2002
Updated: February 13, 2007 11:39:20 AM
Also Known As: BAT_NOWE.A, Worm/BWG.E
Type: Worm
Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP
- Update the virus definitions, run a full system scan, and after you record the names of any .reg, .vbs, .bat, .ifk, .pif, .lnk, Win.ini, and System.ini. files that were overwritten by the worm, delete all files that Norton AntiVirus (NAV) detects as BAT.Beckow.Worm.
- Delete the value
ksflt
from the registry key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Replace overwritten files from a clean backup.
For details on how to do this, read the following instructions.
To scan with Norton AntiVirus and delete the infected files:
- Obtain the most recent virus definitions. There are two ways to do this:
- Run LiveUpdate, which is the easiest way to obtain virus definitions. These virus definitions have undergone full quality assurance testing by Symantec Security Response and are posted to the LiveUpdate servers one time each week (usually Wednesdays) unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, look at the Virus Definitions (LiveUpdate) line at the top of this write-up.
- Download the definitions using the Intelligent Updater. Intelligent Updater virus definitions have undergone full quality assurance testing by Symantec Security Response. They are posted on U.S. business days (Monday through Friday). They must be downloaded from the Symantec Security Response Web site and installed manually. To determine whether definitions for this threat are available by the Intelligent Updater, look at the Virus Definitions (Intelligent Updater) line at the top of this write-up.
Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.
- Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files.
- Run a full system scan.
- Write down the names of any files that NAV detects as BAT.Beckow.Worm, and then delete them.
- Replace the deleted .reg, .vbs, .bat, .ifk, .pif, .lnk, Win.ini, and System.ini. files, (other than those that were dropped by the worm) from a clean backup, or reinstall them. For a list of the files that the worm dropped (copied to the system), read the technical description section of this document.
Writeup By: Frederic Perriot
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