Curious behaviour of MyDoom

Stanier, Alan M alan at ESSEX.AC.UK
Wed Feb 4 09:56:59 GMT 2004

We have two SMTP servers.
Our statistics show that roughly 2/3 of mail comes in through smtp0, and
1/3 through smtp1.
And until recently, 2/3 of the spam came in through smtp0, and 2/3 of
the virus-infected mail,
as I would expect.
But our logs show that about 50% of MyDoom-A is coming through smtp0,
and 50% through
smtp1. Has anyone else seen such behaviour? And can anyone explain why
it happens ... I
can only think that MyDoom gets the MX records of sites, and load
balances between all the
SMTP servers, but why?
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