Advisory Number: AV04-029: WORM_MYDOOM.M
26 July 2004
The purpose of this advisory is to bring attention to a variant of the Mydoom
worm: WORM_MYDOOM.M (aka W32/Mydoom.o@MM, W32.Mydoom.M@mm).
This new variant of W32/Mydoom is packed with UPX. Similarly to previous variants,
it bears the following characteristics:
- mass-mailing worm constructing messages using its own SMTP
- harvests email addresses from the victim machine
- spoofs the From: address
- contains an attachment with a .bat, .cmd, .com, .exe, .pif,
.scr, or .zip extension.
- the attachment name may contain a randomly selected domain,
which was found on the sender's system.
- downloads and executes a backdoor, detected as Backdoor.Zincite.A,
on port 1034/tcp.
PSEPC recommends that you ensure your anti-virus detection software definitions
Additional information about this worm is available at the following links:
Note to Readers
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Unauthorized use of computer systems and mischief in relation to data are serious
Criminal Code offences in Canada. Any suspected criminal activity should be reported
to local law enforcement organizations. The RCMP National
Operations Centre (NOC) provides a 24/7 service to receive such reports or
to redirect callers to local law enforcement organizations. The NOC can be reached
at (613) 993-4460. National security concerns should be reported to the Canadian
Security Intelligence Service (CSIS) at
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