COMPUTER users were being urged to kill a malicious "old school" software worm poised to destroy their files.
Referred to by a host of names including "Kama Sutra", "Grew", and "Blackworm", the malware virus has bored into countless computers worldwide and is reportedly programmed to come to life after the clocks signal the start of Friday.
"Make sure you scan today, don't wait to find out if you've been infected," warned computer virus expert David Perry of Tokyo-based Internet security firm Trend Micro.
"This is flat-out malicious, destroying files."
The company was providing free real-time virus scans called "Housecall at its website, trendmicro.com.
The worm traveled the Internet in emails and got into computers when recipients clicked on unsolicited messages bearing sender names such as crazygirl, badboy, wizzard, and sometimes promising sexy content.
The worm was given a trigger date of today to allow time for it to spread undetected, Perry said.
"Once it starts destroying files, people will hunt it down and kill it," Perry said.
"I don't expect we will hear of mass destruction for this, because we got notice early in the game."
News of a new virus threat often correlates with a spike in infections, evidently because people check their computers and click on the item to see what it will do, according to experts.
"Most of what people know about viruses doesn't come from science, but from movies or fiction," Perry said.
"People seem to think there will be an animated cookie monster."
"In reality, what it will do is wipe out files. Worse, it overwrites them and that will corrupt the back-up system as well."
People can open any document file to check whether their computer was attacked by the worm, according to experts. If the worm came to life in their system, they will find gibberish in what were formerly text files, Perry said.
We will see Friday how many people report it," Perry said.
"People rarely report in when they miss the boat and get infected."
An atlas of infections reported by visitors to Micro Trend's website showed more viruses uncovered in India than in the United States.
There is a whole virus underground out there," Perry said. "They critique each others' work."
Internet security experts advised computer users to keep updated anti-virus software running on their systems.
The Kama Sutra worm was a "feature-rich virus" that also spread by floppy disks or network sharing, and which was designed to sabotage anti-virus software on computers, Perry said.
"This virus contains stealth technology to knock out your anti-virus software," Perry said. "It goes out and defeats them."
That was why Micro Trend provided live online scans for the worm, according to Perry.
Virus fighters at the company reportedly sort through an average of 1300 new forms of malware monthly.