Cognos, a software company ravaged by the Melissa virus, configured its mail servers to block incoming e-mail attachments exceeding 25KB.
Schrader said he expects to see more new versions of the Melissa virus appear to corrupt mail files in any environment.
Luckily BubbleBoy's proud author chose to share his achievement with the manufacturers of anti-virus software, rather than mail it to the rest of us.
Feeding off a mix of millennial angst and residual technophobia, Wobbler is just one of numerous virus hoaxes circulating by e-mail.
The virus was spread by e-mail as an "executable" (.exe) file capable of running on Windows 95 and 98 operating systems.
In a cunning twist by the virus writers, an e-mail in wide circulation that purportedly offers a "fix" for the Sasser worm actually infects the user's computer with a different virulent worm, known as Netsky-AC.
The worm that infected computers at the Marine Corps headquarters at the Pentagon early Friday was ExploreZip, an especially malicious virus that typically travels by e-mail, according to a Marine Corps spokesman.
Schrader said an estimated 20 million Exchange seats and 30 million Lotus Notes mail systems are vulnerable to the virus or its variants.
The Foreign Secretary William Hague revealed in February that computers belonging to the government had been infected with the "Zeus" computer virus, after users opened an e-mail purporting to come from the White House and followed a link.
The calls for coordination became louder after the "I Love You" virus in May affected almost every federal e-mail server and taxed many agencies' resources.
Tech support personnel might have to go desk to desk to do fixes, or perform maintenance on e-mail servers that have become clogged with virus-generated messages.
By attacking a loophole in Microsoft's Outlook e-mail program it has rewritten laws of virus prevention and punched a big hole in PC users security systems that others can drive through.
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It came two years later, in 1999, when the Melissa virus caused big U.S. corporate e-mail systems to collapse, resulting in billions of dollars of losses.
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The US Computer Emergency Readiness Team (US-CERT) has told computer users to be wary of potential e-mail scams, as well as fake anti-virus and phishing attacks regarding the Japan earthquake and the tsunami disasters.
Schrader noted that within six hours of the posting of the virus, tens of thousands of corporate users were unable to access their mail servers.
The Kournikova virus, which only affected those using Microsoft's popular Outlook e-mail program, went on the rampage in February.
School officials determined the virus was similar to Onel de Guzman's thesis, called E:mail Password Sender Trojan, which was designed to obtain Windows passwords, and retrieve Internet accounts from victims' computers.
When it reaches a new victim, the virus searches for addresses to despatch itself to and also picks a random e-mail address for the 'from' line to cover its tracks.
Virus-monitoring company MessageLabs said it had detected and stopped 155, 528 e-mail viruses by the end of November - a rate of one every three minutes.
Schrader said the best defense against Trojan Horse e-mail viruses is end-user education -- and, of course, updated virus-scanning software.
While a computer virus requires some sort of human intervention to be launched, such as opening an e-mail, a worm takes off on its own.
"Among the other recipients of spam e-mails generated by the virus are users' mail2blogger accounts, which allow them to update their blogs via e-mail, " said the spokesperson.
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