RE: Possible New Malware

[Jesse Valentin <jessevalentin () yahoo com>]

Hey Josh, 
 
What type of traffic was this little pest generating? You mentioned that it spiked the CPU utilization to 99%, I was 
curious to know of any specific outbound traffic/ports on the boxes that were infected? When did you discover this 
file? Was this threat relatively new or has it been announced a while back under a different name?
 
I ask because just recently I kind of got stuck with running an Event Response team and these types of things are 
always at the top of the list. At work, we tend to get hit on a regular basis by these types of things for lack of 
proper enforcement on our corporate and system policies. We have some offices that have rogue Internet connections and 
a bunch of other things that keep our job... oh... "fun and exciting"... Im sure you know what I'm talking about... :-) 
 
Thanks,
 
Jesse

"Perrymon, Josh L." <PerrymonJ () bek com> wrote:
After sending the file to the link below this is what we found.
 http://www.kaspersky.com/scanforvirus 
 
I'm awaiting the binary to review.
 
It probably came in on a laptop and spread to machines unpatched to MS04-11.
W32/Forbot-C is a worm which attempts to spread to remote network shares. The worm also contains backdoor Trojan 
functionality, allowing unauthorised remote access to the infected computer via IRC channels while running in the 
background as a service process. 

W32/Forbot-C moves itself to the Windows system folder as winitr32.exe andcreates the following registry entries to run 
itself on system logon: 

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Win32 Wmls Driver = winitr32.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce\
Win32 Wmls Driver = winitr32.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Win32 Wmls Driver = winitr32.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
Win32 Wmls Driver = winitr32.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce\
Win32 Wmls Driver = winitr32.exe 

W32/Forbot-C attempts to spread to network machines using various exploits including the LSASS vulnerability (please 
see MS04-011). 

W32/Forbot-C attempts to terminate several processes related to anti-virus and security related software. 

 


-----Original Message-----
From: Perrymon, Josh L. [mailto:PerrymonJ () bek com] 
Sent: Tuesday, September 14, 2004 9:02 AM
To: full-disclosure () lists netsys com
Subject: [Full-disclosure] Possible New Malware



Anyone Heard of BackDoor-CIW? 

This is a piece of malware with the .exe of winstr32.exe that is causing 99% CPU on a couple machine at a remote 
location. I found that one infected machine does not have MS04-11 patched. So that could be an attack vector.

I get no luck googling for the .exe or BackDoor-CIW   <----  This is what Postini identifies the file as. 

I'm trying to get a copy to put in my VMWare Lab. 


Also----   Isn't there a website that we can email this file to and it will run several AV solutions on it to find more 
info?


Joshua Perrymon 
Sr. Network Security Consultant 

PGP Fingerprint 
51B8 01AC E58B 9BFE D57D  8EF6 C0B2 DECF EC20 6021 

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