Origins: Bagle is a mass-mailing worm that affects only Microsoft NT or Windows-based systems. It searches files on infected systems with specified extensions (.wab, .txt, .htm and .html) for e-mail contacts and replicates by mailing itself out to those contacts as a message attachment. (The attachment name is a random string of letters followed by .EXE, just as the first line of the message is a random string of letters.) Bagle checks the current system date and does nothing if the date is 28 January 2004 or later.
WORM_BAGLE.A (Trend Micro)
Last updated: 21 January 2008
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