Computer
Viruses
Computer viruses that come a callin’ –
the list of computer worm and trojan viruses
Every day new computer viruses are created to annoy us and to
wreck a havoc on our computer systems. Many of them are simply
designed to annoy and cause disruptions on your computer or
computer systems. But some of them can cause a serious and
permanent damage and loss of data, often resulting in having to
make costly repairs to your computer system, while you try to
fight off viruses.
The 10 Most Prevalent Computer
Worm and Trojan Viruses
Below are ten viruses currently cited as being the most
prevalent in terms of being seen the most or in their ability to
potentially cause damage. New viruses are created daily. This is by
no means an all inclusive list. The best thing you can do is to
remain vigilant, keep your anti-virus software updated, and stay
aware of the current computer virus threats.
Virus: Trojan.Lodear
A Trojan horse that
attempts to download remote files. It will inject a .dll file into
the EXPLORER.EXE process causing system instability.
Virus: W32.Beagle.CO@mm
A mass-mailing worm
that lowers security settings. It can delete security-related
registry sub keys and may block access to security-related
websites.
Virus: Backdoor.Zagaban
A Trojan horse that
allows the compromised computer to be used as a covert proxy and
which may degrade network performance.
Virus: W32/Netsky-P
A mass-mailing worm which
spreads by emailing itself to addresses produced from files on the
local drives.
Virus: W32/Mytob-GH
A mass-mailing worm and IRC
backdoor Trojan for the Windows platform. Messages sent by this
worm will have the subject chosen randomly from a list including
titles such as: Notice of account limitation, Email Account
Suspension, Security measures, Members Support, Important
Notification.
Virus: W32/Mytob-EX
A mass-mailing worm and IRC
backdoor Trojan similar in nature to W32-Mytob-GH. W32/Mytob-EX
runs continuously in the background, providing a backdoor server
which allows a remote intruder to gain access and control over the
computer via IRC channels. This virus spreads by sending itself to
email attachments harvested from your email addresses.
Virus: W32/Mytob-AS, Mytob-BE, Mytob-C, and
Mytob-ER
This family of worm variations possesses
similar characteristics in terms of what they can do. They are
mass-mailing worms with backdoor functionality that can be
controlled through the Internet Relay Chat (IRC) network.
Additionally, they can spread through email and through various
operating system vulnerabilities such as the LSASS (MS04-011).
Virus: Zafi-D
A mass mailing worm and a
peer-to-peer worm which copies itself to the Windows system folder
with the filename Norton Update.exe. It can then create a
number of files in the Windows system folder with filenames
consisting of 8 random characters and a DLL extension. W32/Zafi-D
copies itself to folders with names containing share, upload, or
music as ICQ 2005a new!.exe or winamp 5.7 new!.exe. W32/Zafi-D will
also display a fake error message box with the caption "CRC:
04F6Bh" and the text "Error in packed file!".
Virus: W32/Netsky-D
A mass-mailing worm with IRC
backdoor functionality which can also infect computers vulnerable
to the LSASS (MS04-011) exploit.
Virus: W32/Zafi-B
A peer-to-peer (P2P) and
email worm that will copy itself to the Windows system folder as a
randomly named EXE file. This worm will test for the presence of an
internet connection by attempting to connect to www.google.com or
www.microsoft.com. A bilingual, worm with an attached Hungarian
political text message box which translates to "We demand that the
government accommodates the homeless, tightens up the penal code
and VOTES FOR THE DEATH PENALTY to cut down the increasing crime.
Jun. 2004, Pécs (SNAF Team)"
How to minimize your computer
system exposure to viruses
So, beware of viruses by avoding visits to suspicious websites
and not openning email attachments, unless they're from trusted
friends. Even then, always keep your antivirus protection on when
online or openning email attachments. And above all, keep your
antivirus software or internet security subscription always current
and get automatic updates.
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