Trojan-Dropper.Win32.Small.cw

Technical Details
Payload
Removal instructions

Technical Details

This Trojan is designed to install and launch other programs on the victim machine. It is a Windows PE EXE file. It is 19,456 bytes in size. It is packed using UPX. The unpacked file is approximately 84KB in size.

Payload

Once launched, the Trojan extracts the following files from itself and launches them for execution:

• %WinDir%\svchost.exe — this file is 19,968 bytes in size. It will be detected by Kaspersky Anti-Virus as Trojan-Downloader.Win32.Small.ci;
• %System%\svchosts.exe — this file is 25,088 bytes in size. It will be detected by Kaspersky Anti-Virus as Trojan-Proxy.Win32.Daemonize.a;
• %System%\svchostc.exe — this file is 19,456 bytes in size. It will be detected by Kaspersky Anti-Virus as Trojan-Proxy.Win32.Daemonize.a.

The Trojan also drops the following file, %WinDir%\sysini.ini, which contains the following string:

***Computer was successfully infected***

The Trojan adds the following parameter to the Window system registry in order to ensure that its executable file will be launched automatically:

Removal instructions

If your computer does not have an up-to-date antivirus, or does not have an antivirus solution at all, follow the instructions below to delete the malicious program:

1. Use Task Manager to terminate the Trojan process.
2. Delete the original Trojan file (the location will depend on how the program originally penetrated the victim machine).
3. Delete the files created by the Trojan:

   %WinDir%\svchost.exe
   %System%\svchosts.exe
   %System%\svchostc.exe
   %WinDir%\sysini.ini

4. Delete the following system registry key parameter:
   [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
   "Online Service"="%WinDir%\svchost.exe"
5. Update your antivirus databases and perform a full scan of the computer (download a trial version of Kaspersky Anti-Virus).