RE: Logs: Many hits with source port of 80

From: James C Slora Jr <Jim.Slora(at)phra.com>
Date: Mon Dec 16 2002 - 08:37:20 EST

I have seen similar hits for the past three months.

Mine are UDP. Are you sure yours are TCP? All mine had destination port 37852. All hits have been from the same two hosts, and are fairly infrequent.

2002-12-11 14:56:03 63.211.17.228 myhost Udp 80 37852
2002-12-11 14:56:06 64.152.70.68 myhost Udp 80 37852
2002-12-11 14:56:08 63.211.17.228 myhost Udp 80 37852
2002-12-11 14:56:11 64.152.70.68 myhost Udp 80 37852
2002-12-11 15:04:20 64.152.70.68 myhost Udp 80 37852
2002-12-11 15:04:25 64.152.70.68 myhost Udp 80 37852

The reverse DNS for 64.152.70.68 is proximitycheck2.allmusic.com, but proximitycheck2.allmusic.com doesn't resolve to anything. The reverse DNS for 63.211.17.228 is proximitycheck1.allmusic.com, but proximitycheck1.allmusic.com doesn't resolve to anything.

These always appear after a user visits www.allmusic.com and I believe the packets are benign but annoying load balancing probes. Your probes may possibly have similar origins - try correlating the probes with web logs if you have them.

-----Original Message-----
From: Byrne Ghavalas [mailto:security@nscs.uk.com] Sent: Friday, December 13, 2002 5:06 AM
To: incidents@securityfocus.com
Subject: Logs: Many hits with source port of 80

Hi All,

Has anyone else noticed a high number of hits in their security logs, where the source port is set to tcp 80 and the destination port is some high tcp port? I have noticed that these events seem to be getting more numerous than the NetBios scans ;-)

For example:

2002-12-13 09:08:04 194.78.225.36:80 XX.XX.XX.XX:29439
2002-12-13 09:07:04 194.78.225.36:80 XX.XX.XX.XX:29439
2002-12-13 09:06:05 194.78.225.36:80 XX.XX.XX.XX:29439
2002-12-13 09:05:04 194.78.225.36:80 XX.XX.XX.XX:29439
2002-12-13 09:04:04 194.78.225.36:80 XX.XX.XX.XX:29439
2002-12-13 09:03:05 194.78.225.36:80 XX.XX.XX.XX:29439
2002-12-13 09:02:04 194.78.225.36:80 XX.XX.XX.XX:29439
2002-12-13 09:01:28 194.78.225.36:80 XX.XX.XX.XX:29439
2002-12-13 09:01:10 194.78.225.36:80 XX.XX.XX.XX:29439
2002-12-13 09:01:01 194.78.225.36:80 XX.XX.XX.XX:29439
2002-12-13 09:00:57 194.78.225.36:80 XX.XX.XX.XX:29439
2002-12-13 09:00:55 194.78.225.36:80 XX.XX.XX.XX:29439
2002-12-13 09:00:54 194.78.225.36:80 XX.XX.XX.XX:29439
2002-12-13 09:00:54 194.78.225.36:80 XX.XX.XX.XX:29439

It appears to be some kind of automated scan as the time of each entry appears to follow a pattern.

Byrne Ghavalas

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This list is provided by the SecurityFocus ARIS analyzer service. For more information on this free incident handling, management and tracking system please see: http://aris.securityfocus.com Received on Mon Dec 16 12:57:14 2002