MyLife isn't the only virus to make a come back. Antivirus researchers are now warning about the eighth return of the notorious Klez worm.
There is some dispute over whether the latest outbreak is known as Klez.g or Klez.h, but the culprit is a mass mailing worm that purports to offer an antidote to all the other Klez variants.
To add insult to injury, the worm also includes a second virus, Elkern, in a double whammy infection.
The virus comes as an attachment to an email with a variety of subject lines, but it also has a message warning about the danger of the Klez worm and urging users to execute the attached 'antidote' file.
The message, which includes a footnote telling the user to ignore antivirus software warnings that the attachment is infected, reads: "Note: Because this tool acts as a fake Klez to fool the real worm, some AV monitors maybe cry when you run it. If so, ignore the warning, and select 'continue'."
If either virus launches automatically by exploiting an old and well known vulnerability in Outlook Express, or if it convinces a user to run the file, it will use its own mailing engine to spread itself to every name in the Windows Address Book or through vulnerable network drives.
Klez.g/h also carries a new version of the partially encrypted Elkern virus. This is capable of spreading through network drives and the new version may be capable of deleting files on a pre-determined date.
Kaspersky Labs has already warned of "numerous infections in many countries including Japan, China, Austria and the Czech Republic".
Virus researcher Costin Ionescu at BitDefender said there has been a mass outbreak in Pakistan.
"The virus has already demonstrated a great potential for spreading and it could cause great damage", he warned.
"The new version also carries the file infector Elkern in a new version, which tries to delete files at a specified date."
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