RE: load of connections to ephemeral ports from TCP source port 3389(probably virus)

[Michael Sturtz <Michael.Sturtz () PACCAR com>]

Someone appears to be trying to connect over RDP (Microsoft Remote Desktop Protocol).  Do you have that port open 
inbound from the internet to your Windows 2003 server?  If so it would appear that they are trying to logon to the 
console of the machine.   
Michael

-----Original Message-----
From: listbounce () securityfocus com [mailto:listbounce () securityfocus com] On Behalf Of Martin T
Sent: Wednesday, October 26, 2011 5:23 PM
To: security-basics () securityfocus com
Subject: load of connections to ephemeral ports from TCP source port 3389(probably virus)

If I check the traffic passing my router(using NetFlow), 98% of the flows are following:

srcIP            dstIP            prot  srcPort  dstPort  octets      packets
I.I.P.P        192.168.2.196    6     3389     3799     55          1
I.I.P.P        192.168.2.196    6     3389     4465     40          1
I.I.P.P        192.168.2.196    6     3389     1940     74          1
I.I.P.P        192.168.2.196    6     3389     2611     51          1
I.I.P.P        192.168.2.196    6     3389     2356     141         1
I.I.P.P        192.168.2.196    6     3389     2111     92          1
I.I.P.P        192.168.2.196    6     3389     1151     339         1
I.I.P.P        192.168.2.196    6     3389     2609     55          1
I.I.P.P        192.168.2.196    6     3389     1386     1500        1
I.I.P.P        192.168.2.196    6     3389     3133     1480        1
I.I.P.P        192.168.2.196    6     3389     2684     3000        2

"I.I.P.P" is a random public IP address. 192.168.2.196 is a Windows Server 2003 in LAN. As you can see, almost every 
connection is to ephemeral port on 192.168.2.196 using the source port 3389. In addition, download traffic is 5x higher 
than upload traffic(download from Internet is ~50Mbps while upload to Internet is ~10Mbps).

Has someone seen such pattern before? Maybe able to name a possible virus family?

regards,
martin

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Securing Apache Web Server with thawte Digital Certificate
In this guide we examine the importance of Apache-SSL and who needs an SSL certificate.  We look at how SSL works, how 
it benefits your company and how your customers can tell if a site is secure. You will find out how to test, purchase, 
install and use a thawte Digital Certificate on your Apache web server. Throughout, best practices for set-up are 
highlighted to help you ensure efficient ongoing management of your encryption keys and digital certificates.

http://www.dinclinx.com/Redirect.aspx?36;4175;25;1371;0;5;946;e13b6be442f727d1
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