Net-Worm.Win32.Kolab

Parent class: VirWare

Viruses and worms are malicious programs that self-replicate on computers or via computer networks without the user being aware; each subsequent copy of such malicious programs is also able to self-replicate. Malicious programs which spread via networks or infect remote machines when commanded to do so by the “owner” (e.g. Backdoors) or programs that create multiple copies that are unable to self-replicate are not part of the Viruses and Worms subclass. The main characteristic used to determine whether or not a program is classified as a separate behaviour within the Viruses and Worms subclass is how the program propagates (i.e. how the malicious program spreads copies of itself via local or network resources.) Most known worms are spread as files sent as email attachments, via a link to a web or FTP resource, via a link sent in an ICQ or IRC message, via P2P file sharing networks etc. Some worms spread as network packets; these directly penetrate the computer memory, and the worm code is then activated. Worms use the following techniques to penetrate remote computers and launch copies of themselves: social engineering (for example, an email message suggesting the user opens an attached file), exploiting network configuration errors (such as copying to a fully accessible disk), and exploiting loopholes in operating system and application security. Viruses can be divided in accordance with the method used to infect a computer:

• file viruses
• boot sector viruses
• macro viruses
• script viruses

Any program within this subclass can have additional Trojan functions. It should also be noted that many worms use more than one method in order to spread copies via networks.

Class: Net-Worm

Net-Worms propagate via computer networks. The distinguishing feature of this type of worm is that it does not require user action in order to spread. This type of worm usually searches for critical vulnerabilities in software running on networked computers. In order to infect the computers on the network, the worm sends a specially crafted network packet (called an exploit) and as a result the worm code (or part of the worm code) penetrates the victim computer and activates. Sometimes the network packet only contains the part of the worm code which will download and run a file containing the main worm module. Some network worms use several exploits simultaneously to spread, thus increasing the speed at which they find victims.

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Platform: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.

Description

The worm's entire payload is executed through a code that is injected into the address space of the process "EXPLORER.EXE". The payload is not executed if any one of the following conditions is fulfilled:

• The following branch is missing from the system registry:

  [HKCUControl PanelPowerCfgPowerPolicies]

• The current user's account name is:

  USERNAME
  
  
  
  user
  
  
  
  COMPUTERNAME
  
  
  
  CurrentUser
  
  
  
  

• The following libraries are loaded in the worm's address space:

  SbieDll.dll
  
  
  
  dbghelp.dll
  
  
  
  api_log.dll
  
  
  
  dir_watch.dll
  
  
  
  pstorec.dll
  
  
  
  

• The worm's original file was saved in the system as:

  
  
  
  c:file.exe

  After injecting the malicious code through the process "EXPLORER.EXE", the following actions are performed:
• To ensure that the process is unique within the system, a unique identifier is created, which is named:
• To provide access to the infected system, the following named pipe is created:

  .piperrreokdirjiurururr

• A connection is established to the malicious user's server:

  
  
  
  di***ind.cn
  
  
  
  ant***tition.com
  
  
  
  fre***unge.com
  
  
  
  

  Following a command by the malicious user, the worm can perform the following actions on the infected computer:
  • Organize a DoS attack on specified servers.
  • Download files from links sent to it. The downloaded files are saved in the current user's temporary files directory "%Temp%" using random names.
  • Download updated version of the worm from the malicious user's server.
  • Analyze files of settings for these browsers:

    
    
    
    Mozilla Firefox
    
    
    
    Internet Explorer
    
    
    
    Google Chrome
    
    
    
    Opera
    
    
    
    

    for the purpose of stealing passwords saved in them.
  • Steal and modify browser cookies. To do this, the worm uses the "sqlite" module built into the browser Mozilla Firefox.
  • The actions described in the "Installation" and "Propagation" sections. The worm makes exchanges with the malicious user's server through messages of the following type:

    
    
    
    Scan stopped
    
    
    
    Scan running
    
    
    
    Scan started
    
    
    
    KB data sent: <number>
    
    
    
    SYN packets sent: <number>
    
    
    
    Flood running
    
    
    
    flood stopped: <string>
    
    
    
    flooding: <string>
    
    
    
    Drive infected: <string>
    
    
    
    USB spreader running
    
    
    
    P2P Copy to: <string>
    
    
    
    MSN spreader running
    
    
    
    MSN spread started, link: <string>MSN link sent
    
    
    
    

  • By command from the malicious user, it is also possible to substitute the "hosts" file:

    %System%driversetchosts

    At the time of writing, the malicious user's server was not responding.

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