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Spam is pouring in. Tried everything.

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Spam is pouring in. Tried everything. - 22.Dec.2003 11:27:00 AM   
Kimmy

 

Posts: 11
Joined: 22.Dec.2003
From: Norway
Status: offline
Sorry to bother you all with another one of those spamposts.

The problem is that I have a Exchange server, and someone is using it to send spam (at least trying). I have changed all userpasswords, and followed the instruction found in http://www.vamsoft.com/orf/authattack.asp

What is happening is that my Queue folder is still increasing by the minutes, and I get hundred of new "mails" in my badmail folder. I thought the instruction above would prevent this "[Frown]"

Are there any advice how I can stop this?

Some extra information: When I look at current sessions (SMTP virtual) I see lots of random "users" that are on for a few seconds. This is users like "sausage" and other strange words.

Thanks for all help.
And happy holliday "[Smile]"
Post #: 1
RE: Spam is pouring in. Tried everything. - 24.Dec.2003 4:11:00 PM   
pjhutch

 

Posts: 3578
Joined: 21.Jul.2001
From: W Yorks, England
Status: offline
Sounds like your exchange server has an open relay on it and users from any site can send spam.

See http://support.microsoft.com/default.aspx?scid=kb;en-us;319267&Product=exch2k

(in reply to Kimmy)
Post #: 2
RE: Spam is pouring in. Tried everything. - 23.Feb.2004 8:50:00 PM   
Christ5340

 

Posts: 33
Joined: 12.Dec.2003
From: Dothan, AL
Status: offline
Turn on SMTP logging(all fields), what a couple of days, then import those text(log) files into Excel or Access and sort based on IP, grouping by counting and you can see which IP's are hitting you the most. For the IP's and domains that you don't recognize, check that IP address using ARIN, http://ws.arin.net/cgi-bin/whois.pl and see where the registrar is located. Most likely will be Asia, SA, or Europe if it's spam ore relay attemtps. I had this same problem, did what I've discussed and blocked the following netblocks at my Cisco Internet router using access-list 100 deny ip host xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx any
I blocked the following netblocks which include most all of Asia, some European, and some known US spammers and my spam is 99.999% gone.
deny ip 202.0.0.0 0.255.255.255 any
deny ip 203.0.0.0 0.255.255.255 any
deny ip 217.0.0.0 0.255.255.255 any
deny ip 218.0.0.0 0.255.255.255 any
deny ip 219.0.0.0 0.255.255.255 any
deny ip 220.0.0.0 0.255.255.255 any
deny ip 221.0.0.0 0.255.255.255 any
deny ip 222.0.0.0 0.255.255.255 any
deny ip 188.0.0.0 0.255.255.255 any
deny ip 80.0.0.0 0.255.255.255 any
deny ip 81.0.0.0 0.255.255.255 any
deny ip 82.0.0.0 0.255.255.255 any
deny ip 60.0.0.0 0.255.255.255 any
deny ip 61.0.0.0 0.255.255.255 any
deny ip 62.0.0.0 0.255.255.255 any
deny ip 210.0.0.0 0.255.255.255 any
deny ip 211.0.0.0 0.255.255.255 any
deny ip 212.0.0.0 0.255.255.255 any
deny ip 213.0.0.0 0.255.255.255 any
deny ip 193.0.0.0 0.255.255.255 any
deny ip 194.0.0.0 0.255.255.255 any
deny ip 195.0.0.0 0.255.255.255 any
deny ip 38.0.0.0 0.255.255.255 any
deny ip 43.0.0.0 0.255.255.255 any
deny ip 133.0.0.0 0.255.255.255 any
deny ip 83.0.0.0 0.255.255.255 any

(in reply to Kimmy)
Post #: 3

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