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Re: [Exim] Mydoom and virus signature updates   Message List  
Reply | Forward Message #69822 of 85778 |
Re: [Exim] Mydoom and virus signature updates

[Try it again with the subscribe user this time]

Dan Egli said:
> Well, I know Mcafee's dailydats had it when we got hit at 10:00am local
time (UTC-6). ClamAv probably had it shortly also, but I don't know. I
haven't been hit with it yet. I just looked in my virusmails dir and I
have a few copies of Gibe, one of Bagle, and one of Netsky/SomeFool.
>
> To date I don't have a MyDoom.o instance on the machine. As much as I
respect ClamAV I'm really thinking I'm going to put the mcafee unix
virusscan on the system again, to provide an extra layer of protection.

We are blocking based upon a number of issues, some of which were being
done before the outbreak.

o helo check on our domain.name A ton of them present the domain name
as a helo when they connect.
o Blacklist of postmaster@ourdomains replyto@ourdomains
mail-daemon@ourdomains. There is no reason for someone
outside our network to send mail FROM any of those to us.
This only blocks sites connecting to us, not our sites or
clients sending to us.
o Script to check extensions in Zip file. blocks normal cmd, com, pif
scr, bat that might be contained in a zip file.
o Script modified to deny any zip in a zip.
o Spam assassin change to up the FORGED_MUA_OUTLOOK to beyond spam
threshold on that specific finding.

Other than a few Double Zip's that got in on Sunday before clamAv updated,
we never see a virus catch now since they never get to that check.

The problem has been a big non-issue to us so far, but a ton of mail is
being blocked as a result of the rules we use with no real collateral
damage seen.



--

## List details at http://www.exim.org/mailman/listinfo/exim-users Exim details
at http://www.exim.org/ ##




Tue Jul 27, 2004 9:17 pm

listaccount@...
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Message #69822 of 85778 |
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... Well, I know Mcafee's dailydats had it when we got hit at 10:00am local time (UTC-6). ClamAv probably had it shortly also, but I don't know. I haven't been...
Dan Egli
dan@...
Send Email
Jul 27, 2004
9:00 pm

... ClamAV is calling it Mydoom.M, I think, rather than .o - we've been catching huge numbers of them with it since yesterday, but maybe you're not using a...
Stephen Gran
steve@...
Send Email
Jul 27, 2004
9:04 pm

I am getting them as Mydoom.M so far. I had to update my clamav since I was on a older version and the main.cvd was not updating correctly. Now that I am on...
lists
lists@...
Send Email
Jul 27, 2004
9:12 pm

[Try it again with the subscribe user this time] ... time (UTC-6). ClamAv probably had it shortly also, but I don't know. I haven't been hit with it yet. I...
Kevin Reed
listaccount@...
Send Email
Jul 27, 2004
9:20 pm

... we do this as well. ... replyto doesn't exist, bounces to mailer-daemon are blocked, but we allow postmaster. I'm not too worried about my own mailbox...
Kjetil Torgrim Homme
kjetilho@...
Send Email
Jul 28, 2004
4:25 am

... I should point out that I did get a response from Sophos yesterday, and they told me that these "executables" were just random noise, and harmless. I'm...
Kjetil Torgrim Homme
kjetilho@...
Send Email
Jul 28, 2004
4:12 am

... We are blocking based upon a number of issues, some of which were being done before the outbreak. o helo check on our domain.name A ton of them present...
Kevin W. Reed
hostmaster@...
Send Email
Jul 28, 2004
8:02 am
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