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The Top Ten
1. ILOVEYOU - (2000) One of the most widespread and rapidly spreading viruses ever, the ILOVEYOU virus spread via e-mail, posing as an executable attachment sent by a friend from the target's contact list.
2. Code Red - (2001) IIS on Windows servers were the target of this virus. It also launched denial of service (DoS) attacks.
3. Nimda - (2001) Nimda used seemingly every possible method to spread, and was very effective at doing so. Nimda is notable for being one of the fastest spreading and most widespread viruses ever.
4. Melissa - (1999) The Melissa virus is notable because it is a Word macro virus. It cleverly spread via e-mails sent to contacts from the infected users' address books.
5. Sasser - (2004) Sasser exploited a buffer overflow and spread by connecting to port 445 on networked Windows systems. The chaos caused was possibly the worst ever, as systems restarted or crashed.
6. The Morris Internet Worm - (1988) The grandfather of computer worms, the Morris worm infected Unix systems and was notable for its "accidental" virulence.
7. Blaster - (2003) Blaster exploited a Windows operating system vulnerability and let users know of its presence with a system shutdown warning.
8. SQL Slammer - (2003) This tiny virus infected servers running Microsoft's SQL Server Desktop Engine, and was very fast to spread.
9. Elk Cloner - (1982) Despite Apple's marketing that their systems are less prone to viruses that was not always the case. Notable as possible the first personal computer virus, Elk Cloner infected the boot sector of Apple II floppies.
10. Creeper - (1971) This is noted as possibly the first ever computer virus. It infected computers on ARPANET. Mostly harmless, the concept of Creeper has infected the minds of rogue programmers through today.
Let Us Have a look on how these each of viruses worked and what damages they have made.
1.ILOVEYOU virus:
The Name Sounds very romantic. haha. But like most of the girlfriend it just harms our expectations. :-)
How It Works : This virus is an attachment to the mail having the subject as ILOVEYOU. The attachment contained the "ILOVEYOU.vbs" file (virus file).It was Arrived in the attachment firstly at May 4 2000, It was a dawn of internet usage. And people were attracted to such type of email and download it. When People run that file,
it collects all the recipients address from Outlook and then it resent itself to all those recipients. Well This is not harmful process but what it did harmful was -
- It deletes all the JPG, JGEP, MPEG, MP3, files
- It also Edited the Windows Registry Values which would create a headache for OS.
Recovery Steps :
Some Antiviruses Suggest to screen all the email attachments before the users download them.
But what the antivirus would do was just check the name of attachment ( ie: whether it was ILOVEYOU.vbs? )
So The Hackers Periodically Changed The name of the Viruse file and kept the content of file same. Some of the Variations were :
- "JOKE"
- "Mother's Day"
- "VIRUS ALERT"
Similarly 12 variations in the name have been identified.
Image :
Double Click on this file would create a Tsunami in the target computer.
2.Code Red:
This Worm Entered into the world on July 13, 2001. This worm was firstly detected by Marc Maiffret and Ryan Permeh,At the time they observe this worm, they were drinking the "Code red Mountain Dew". Hence they named it as Code Red. I believe all the geeks are ( were & will be) very funny.
What It Did :
It was the Server Jamming Worm..
It was the Server Jamming Worm..
It attacked on Microsoft's IIS Server (Internet Information Service)
It would Jam this server and all the requests were denied and system would crush.(Dos)
Reported The loss of $2.75 Billion
(Still to be added info about all viruses as I get The Time.. )
