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Virus:Worm/Kolab.fkt
Date discovered:20/12/2009
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:147.456 Bytes
MD5 checksum:a630f11ba7b0f365374b05fd1c26d8fc
IVDF version:7.10.02.23 - Sunday, December 20, 2009

 General Methods of propagation:
   • Autorun feature
   • Local network
   • Messenger


Aliases:
   •  Mcafee: W32/Kolab
   •  Sophos: Troj/Agent-MFV
   •  Panda: W32/Kolabc.AW.worm
   •  Eset: Win32/AutoRun.IRCBot.DI
   •  Bitdefender: Backdoor.Bot.111901


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Downloads a malicious file
   • Drops malicious files
   • Registry modification
   • Third party control

 Files It copies itself to the following locations:
   • %WINDIR%\usbdrv.exe
   • %drive%\RECYCLER\%CLSID%\usbdrv.exe



It deletes the following file:
   • c:\x.bat



The following files are created:

%WINDIR%\nigzss.txt
%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

– c:\x.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file. Detected as: Worm/IrcBot.50




It tries to download a file:

– The location is the following:
   • http://www.whati**********/




It tries to executes the following files:

– Filename:
   • cmd /c ""c:\x.bat" "


– Filename:
   • "%WINDIR%\usbdrv.exe"


– Filename:
   • net stop "Security Center"


– Filename:
   • net1 stop "Security Center"

 Registry One of the following values is added in order to run the process after reboot:

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Universal Bus device"="usbdrv.exe"

 Messenger It is spreading via Messenger. The characteristics are described below:

– AIM Messenger
– MSN Messenger
– Yahoo Messenger

The URL then refers to a copy of the described malware. If the user downloads and executes this file the infection process will start again.

 Network Infection In order to ensure its propagation the malware attemps to connect to other machines as described below.


Exploit:
It makes use of the following Exploits:
– MS03-026 (Buffer Overrun in RPC Interface)
– MS03-039 (Buffer Overrun in RPCSS Service)
– MS04-007 (ASN.1 Vulnerability)
– MS04-011 (LSASS Vulnerability)
– MS06-040 (Vulnerability in Server Service)


IP address generation:
It creates random IP addresses while it keeps the first octet from its own address. Afterwards it tries to establish a connection with the created addresses.

 IRC To deliver system information and to provide remote control it connects to the following IRC Servers:

Server: shell.vir**********.com
Port: 9595
Channel: #ms16
Nickname: {I-00-USA-XP-%computer name%}

Server: v1.virtual-rejectz.com

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Petre Galan on Wednesday, March 31, 2010
Description updated by Petre Galan on Wednesday, March 31, 2010

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