RE: [Full-Disclosure] Possible New Malware

[Jesse Valentin <jessevalentin@xxxxxxxxx>]

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@xxxxxxx> 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@xxxxxxx] 
Sent: Tuesday, September 14, 2004 9:02 AM
To: full-disclosure@xxxxxxxxxxxxxxxx
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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