RE: Outbreak of a virus on campus, scanning tcp 80/6129/1025/3127

["Chris Harrington" <cmh () nmi net>]

Jeff,

Those are most likely Phatbot / Agobot / Gaobot infections.
http://www.lurhq.com/phatbot.html I am seeing a lot of hosts trying to
connect to our networks on those ports. In addition I also see ports 4387
and 5000 in the scans.  Snort rules pick these up as Agobot variants.

Phatbot tries to replicate thru:

Mydoom, port 3127
Dameware, port 6129
Universal PnP, port 5000
WebDAV, port 80
MS SQL, port 1434
Bagle, port 4387


Symantec does have info on removal under W32.HLLW.Gaobot.gen:
http://www.sarc.com/avcenter/venc/data/pf/w32.hllw.gaobot.gen.html

Good luck with it.

--
Christopher Harrington, CISSP
Security Engineer
NMI InfoSecurity Solutions
207-780-6381, x236
http://www.nmi.net


-----Original Message-----
From: Jeff Kell [mailto:jeff-kell () utc edu] 
Sent: Tuesday, April 20, 2004 10:02 PM
To: General DShield Discussion List; Incidents
Subject: Outbreak of a virus on campus, scanning tcp 80/6129/1025/3127

We have had a significant outbreak of a yet-unidentified virus on campus
  covering several dozen machines and one remote lab (possibly 100 in all).
The characteristics I have observed remotely (no possibility of forensics
at the moment, just shutting down ports) are as follows:

* listens on two random, high-numbered tcp ports
* picks a random address within the infected machine's /8 subnet
* scans (in order) 80, 6129, 1025, 3127 (all tcp) from ephemeral
   source ports (the source port is not fixed).

It could have gained entry via tcp/1025 as all the others are blocked on
ingress, or it could have been brought inside via laptop.  Strangely enough
it has not been detected in our dorms (where most of our slime tends to
grow).  An off-campus lab connected via half a T1 was almost entirely
consumed, I have shutdown their serial interface (can't diagnose this one
as the packet loss was incredibly high).

I suspect this originated as one of the MS04-xxxx exploits patched last
week, we've already done this exercise with other RPC-ish vulnerabilities
and taken time to update lab machines.

Sound familiar to anyone?

Jeff Kell
University of Tennessee at Chattanooga


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