Symantec Security Response encourages all users and
administrators to adhere to the following basic security
"best practices":
- Turn off and remove unneeded services. By default,
many operating systems install auxiliary services that
are not critical, such as an FTP server, telnet, and a
Web server. These services are avenues of attack. If
they are removed, blended threats have less avenues of
attack and you have fewer services to maintain through
patch updates.
- If a blended
threat exploits one or more network services,
disable, or block access to, those services until a
patch is applied.
- Always keep your patch levels up-to-date,
especially on computers that host public services and
are accessible through the firewall, such as HTTP,
FTP, mail, and DNS services.
- Enforce a password policy. Complex passwords make
it difficult to crack password files on compromised
computers. This helps to prevent or limit damage when
a computer is compromised.
- Configure your email server to block or remove
email that contains file attachments that are commonly
used to spread viruses, such as .vbs, .bat, .exe, .pif
and .scr files.
- Isolate infected computers quickly to prevent
further compromising your organization. Perform a
forensic analysis and restore the computers using
trusted media.
- Train employees not to open attachments unless
they are expecting them. Also, do not execute software
that is downloaded from the Internet unless it has
been scanned for viruses. Simply visiting a
compromised Web site can cause infection if certain
browser vulnerabilities are not patched.
The following instructions pertain to
all current and recent Symantec antivirus products,
including the Symantec AntiVirus and Norton AntiVirus
product lines.
Important: On computers running
Norton AntiVirus 2005 or later, the QuickScan tool will
automatically search for and remove malicious threats
when new virus definitions are downloaded. While every
effort has been made to ensure that the QuickScan tool
removes all the traces of a malicious threat from an
infected computer, we advise that you confirm that all
the files and registry entries have been removed. We
recommend following the manual removal steps and
deleting any threat-related files or registry entries
remaining on the computer.
- Disable System Restore (Windows Me/XP).
- Update the virus definitions.
- Run a full system scan and delete all the files
detected as W32.Fili@mm.
- Delete the value that was added to the
registry.
For specific details on each of
these steps, read the following
instructions.
1. 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.
For instructions on how to
turn off System Restore, read your Windows
documentation, or one of the following articles:
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 the aforementioned
documents.
For additional information, and an
alternative to disabling Windows Me System Restore, see
the Microsoft Knowledge Base article, "Antivirus Tools Cannot Clean Infected
Files in the _Restore Folder," Article ID: Q263455.
2.
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 daily. 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.
3. 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.
- Run a full system scan.
- If any files are detected as infected with
W32.Fili@mm, click Delete.
Note:
If your Symantec antivirus product reports that
it cannot delete an infected file, Windows may be
using the file. To fix this, run the scan in Safe
mode. For instructions, read the document, "How to start the computer in Safe
Mode." Once you have restarted in Safe
mode, run the scan again.
(After the files are
deleted, you can leave the computer in Safe mode and
proceed with section 4. When that is done, restart the
computer in Normal mode.)
4. To
delete the value from the registry
Important:
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, "
