Threat Description

Email-Worm:​W32/Zhelatin.KC

Details

Aliases: Email-Worm:​W32/Zhelatin.KC, Email-Worm:​W32/Zhelatin.KC
Category: Malware
Type: Email-Worm
Platform: W32

Summary



Zhelatin.KC is a bot that communicates via Overnet P2P protocol and is mainly used to send spam. It has rootkit functionalities that hide its presence in the infected system.



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details



Zhelatin.KC does the following upon initial installation:

  • Disable Windows File Protection
  • Creates a copy called %WindowsDirectory%\spooldr.exe
  • Drop its rootkit component %SystemDirectory%\spooldr.sys
  • Infects %SystemDirectory%\dllcache\tcpip.sys
  • Exits current process

The other routines of the malware are continued after the infected system is rebooted.The following is how the malware is launched during system startups:

  • The infected tcpip.sys gets loaded by the OS
  • The infected tcpip.sys loads spooldr.sys
  • Spooldr.sys injects spooldr.exe to the explorer.exe process

Once loaded, spooldr.exe creates a file called spooldr.cfg which contains its initial list of peers in the current directory of the running process. Since it does not have its own process, it will take the current directory of explorer.exe instead. This usually leads to spooldr.cfg being created in the home directory of the current user. Additionally, Spooldr.sys hides all filenames that start with "spooldr" in the system, therefore you might not find the created files once the rootkit has been loaded.The malware then tries to communicate with the other peers via the Overnet P2P protocol on how to proceed.The malware has the ability to do the following:

  • Harvest email addresses but avoid those that contain certain strings
  • Download messages to be use in spam
  • Send spam emails





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