An early-morning report on a security mailing list led to the discovery of a mass-mailing email worm that impacted Yahoo webmail users.

The Nugache worm can spread via email, using a variety of subject lines and message text from lists contained in the worm's code. Some of the strings contain strong language and racist tones.

Having your computer infected with a virus or other malicious software is upsetting enough. But having your files literally held hostage is even worse. A ransomware trojan attack infects the system, encrypts the files, and then demands payment from its victims. One of the first to receive wide publicity was the May 2005 discovery of the PGPcoder Trojan.

There are some description about Bagle worm variant warns.

The Trojan was first discovered after it was posted to the Blind Cool Tech mailing list and various other newsgroups for blind users. Jared Rimer of Superior Software became suspicious and forwarded a copy of the suspect file, audiomagic_b001.exe, for analysis.

Discovered on January 17, 2006, the Nyxem (also known as Blackmal) worm has a dangerous payload that executes on the 3rd of each month, overwriting files with specific extensions.

This is a cooperative listing of viruses reported as being in the wild by 80 virus information professionals. The basis for these reports are virus incidents where a sample was received, and positively identified by the participant. Rumors and unverified reports have been excluded.

Discovered on May 8, 2001, the Homepage virus, a.k.a. VBS/VBSWG.X-mm, masquerades as a really cool homepage. The email carrying the worm has an attachment named homepage.HTML.vbs. Those who do not have file extension viewing enabled will see only homepage.HTML - to protect against this simple ruse, enable file extension viewing.

The MakeLOVEnotSPAM screensaver was designed to take advantage of idle computer time to send multiple GET requests to spammer websites, thus slowing down their operations in what many viewed as an illegal Distributed Denial of Service attack. Adding insult to irony, malware authors have released a Trojan that masquerades as the Lycos infamous MakeLOVEnotSPAM screensaver.