New version of Warezov causes epidemic
On the morning of April 19, 2007, Kaspersky Lab, a leading developer of secure content management systems, detected an epidemic caused by Warezov.nf, the latest version of the Warezov email worm. At the peak of the epidemic, the worm accounted for 75 - 80% of all malicious code in mail traffic.
The worm spreads via the Internet as an attachment to infected messages. The attachment does not contain the worm itself, but a component which downloads other malicious programs from the Internet. Infected messages are sent to all email addresses found on the victim machine. The worm is also able to disable and delete antivirus solutions. Warezov.nf is also able to download other malicious programs from a specific site; these programs will provide a malicious user with remote access to an infected machine.
During the height of the outbreak, Warezov.nf caused the overall volume of malicious code to increase to almost 10%. This means that approximately one message in every ten will contain a malicious program. However, by the evening of 19th April, the volume of Warezov.nf in mail traffic began to decline sharply.
An urgent update to Kaspersky antivirus databases containing detection and disinfection routines for Warezov.nf was released on the morning of the 19th, approximately half an hour after the first sample was received. Users of Kaspersky Anti-Virus 6.0/ Kaspersky Internet Security 6.0 should enable proactive protection, and the worm will be blocked without the need to update antivirus databases. All users are recommended to keep their antivirus protection up to date, and not open emails from unknown senders.
About Kaspersky Lab
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