Viruses Will Come a-Knocking

Every day new computer viruses are created to annoy us and to wreak havoc on our computer systems. Below are ten viruses that I feel are very prevalent and potentially damaging to the average person's computer system.

This is by no means a comprehensive, complete list. New viruses are constructed DAILY and there are hundreds of thousands of different viruses being circulated constantly online. To avoid becoming 'infected', remain vigilant (don't EVER surf the web with your 'anti-anything-ware' shut off - even for a few minutes!) Keep your anti-virus software updated, and stay aware of the current computer virus threats.

Here's the small list of viruses that are very common

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(dot)Beagle(dot)CO(at)mm (sorry had to type out the dot and @ sign because the blogger software kept making a link of the virus name)

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-DA 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)"

THESE ARE ALL VERY NASTY, but this is a very tiny list indeed. I thought I should post about what a few viruses DO TO YOUR COMPUTER so that if anyone has been having computer troubles and has NOT yet suspected a virus as the culprit, they can start to point their attention in the right direction to try to figure out if a virus is making their computer run slow, show error messages and display other virus-related problems.

Run your anti-virus software's scan mode often - and UPDATE your software often. Many anti-virus programs can help you detect and clean your computer - but no program will help you if you're not doing regular scans and updates.