CIAC recommends that you DO NOT circulate  warnings without first checking with an authoritative source. Authoritative sources are your computer system security administrator, your computer incident handling team, or your antivirus vendor. Real warnings about viruses and other network problems are issued by computer security response teams (CIAC, CERT, ASSIST, NASIRC, etc.) and are digitally signed by the sending team using PGP. If you download a warning from a team's web site or validate the PGP signature, you can usually be assured that the warning is real. Warnings without the name of the person sending the original notice, or warnings with names, addresses and phone numbers that do not actually exist are probably hoaxes. Warnings about new malicious code are also available at the antivirus vendors sites and at the operating system's vendor site.