[Full-Disclosure] RE: Probable new MS DCOM RPC worm for Windows

["Williams Jon" <WilliamsJonathan@xxxxxxxxxxxxx>]

Since I've been watching for a new worm that uses the MS03-039 vulnerability, 
when I saw this message, I went over to incidents.org to check out and see if 
they were seeing an increase, too.  Lo and behold, their charts for both TCP 
135 and TCP 80 show dramatic increases  in traffic over the past few days.  
Port 135 is up from 377,000 targets on 9/20 to 1,900,000 targets on 9/23, and 
80 is up from 880,000 records on 9/20 to 3,527,000 on 9/23.  Despite this, I'm 
not seeing anything else on the lists about a new worm.

Is anyone seeing anything new out there, or is this just a resurgence of 
Welchia?

-----Original Message-----
From: Richard Johnson [mailto:rnews@xxxxxxxxxxxxxxxxxxx]
Sent: Wednesday, September 24, 2003 10:03 AM
To: full-disclosure@xxxxxxxxxxxxxxxx; incidents@xxxxxxxxxxxxxxxxx
Subject: Re: Probable new MS DCOM RPC worm for Windows


On Sat, 20 Sep 2003 14:41:39 -0600,
 Richard Johnson <rdump@xxxxxxxxx> wrote:

> We've noticed increased scan activity on port 135, ramping up over the 
> past 20 hours.
> 
> The scanning appears to concentrate on nearby /16s...


We finally had infections occur on Tuesday evening showing the same 
scan behavior.  Sysadmins doing cleanup report Norton and McAfee IDed 
the bug as W32.Welchia.

I don't know whether it was a variant using one of the two new RPC 
holes, or just month-old Welchia. That's because the hosts hit were 
traditional non-compliant lab machines and non-adminned remote office 
or home hosts.  In other words, they were still vulnerable to the 
original blaster worm.

The US Dept. of State's CLASS was hit by this one, and it looks like 
they shut down for a short while to contain it:

http://www.azcentral.com/news/articles/0924ComputerVirus24-ON.html


Richard

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