RE: Source port 445,80

["Wong Yu Liang" <wong.yuliang () vads com>]

Thanks valdis 
 I suspected so. Possibly a worm propagation and the ips detected the
*return* traffic. But yet the alerts from my ips is very strange. Some
alerts 

172.16.1.254:80 -> 172.17.17.103:1434 MSSQL buffer overflow detected 
172.16.1.254:80 -> 172.17.17.103:1434 MSSQL buffer overflow detected
172.16.1.254:80 -> 172.17.17.103:1434 MSSQL buffer overflow detected
172.16.1.254:80 -> 172.17.17.103:1434 MSSQL buffer overflow detected
172.16.1.254:80 -> 172.17.17.103:1434 MSSQL buffer overflow detected
172.16.1.254:80 -> 172.17.17.103:1434 MSSQL buffer overflow detected
172.16.1.254:80 -> 172.17.17.103:1434 MSSQL buffer overflow detected
172.16.1.254:80 -> 172.17.17.103:1434 MSSQL buffer overflow detected
172.16.1.254:80 -> 172.17.17.16:1434 MSSQL buffer overflow detected
172.16.1.254:80 -> 172.17.17.16:1434 MSSQL buffer overflow detected
172.16.1.254:80 -> 172.17.17.16:1434 MSSQL buffer overflow detected
172.16.1.254:80 -> 172.17.17.16:1434 MSSQL buffer overflow detected
172.16.1.254:80 -> 172.17.17.16:1434 MSSQL buffer overflow detected
172.16.1.254:80 -> 172.17.17.16:1434 MSSQL buffer overflow detected

And the list goes on to different destination IP addres



-----Original Message-----
From: Valdis.Kletnieks () vt edu [mailto:Valdis.Kletnieks () vt edu] 
Sent: Thursday, September 06, 2007 5:36 AM
To: Wong Yu Liang
Cc: incidents () securityfocus com
Subject: Re: Source port 445,80

On Wed, 05 Sep 2007 18:47:42 +0800, Wong Yu Liang said:

>   Lately I've been getting a lot of awkward alerts with source port
445.
> A few different source IP is connecting to one single IP
> from the source port 445 , to random destination high ports.

Is the destination IP address one that could conceivably be calling
the *source* IPs on those ports, and you're looking at the *return*
traffic?

If so, it could be that the destination IP is being tricked into
visiting
malicious websites and the like, and what you're seeing is the website
sending
more malware down the now-open connection....

(Just asking, because for a *long* time, we had to keep a canned
response
form for "ntp-1.vt.edu is hacking my ports from its port 123"
complaints.
Of course, the *real* story was they enabled NTP, sent us a packet - and
then
their firewall software triggered on the reply).

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