(CNN) -- The MyDoom virus has become the fastest-spreading virus yet, hitting hardest in the United States and Australia, security firm MessageLabs said Wednesday.
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More than 100,000 copies are being intercepted every hour, he added. One in 12 e-mails handled by MessageLabs was infected with the worm.
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FBI agents are investigating the source of the worm, also known as "W32/Mydoom.A-mm," "Novarg" or "WORM_MIMAIL.R."
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The message in MyDoom is sent as a binary attachment. It often arrives in a zip archive of 22,528 bytes and is represented by a text icon even though it is an executable file, which are renowned for carrying viruses.
While the body of the e-mail varies, it usually includes what appears to be an error message, such as: "The message cannot be represented in 7-bit ASCII encoding and has been sent as a binary attachment."
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The worm is contained in e-mails with random senders' addresses and subject lines.
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When loaded, some versions of the worm launch Notepad and show random characters. At the same time it replicates itself, opens a backdoor that could allow hackers to break in and, in some instances, installs a "keystroke" program that records everything being typed, including passwords and credit card numbers.
The worm is also spreading via popular Internet file sharing networks such as Kazaa, where it appeared with names such as "Winamp5" "ICQ2004-final."
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CNN.com's Jeordan Legon contributed to this report.
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