Threat Description

Win32.HLLP.DeTroie

Details

Aliases: Win32.HLLP.DeTroie, TCV, TCV3, CV-B
Category: Malware
Type:
Platform: W32

Summary



The 'Sockets De Troie' (Trojan Sockets - fr.) virus is the biggest high level language virus ever created (at least by the time of creation of this description - October 1998). The length of its body is more than 443 kb. The virus was created with Delphy 3. Currently 3 variants are known.



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



The DeTroie virus has a remote administration tool inside (like Back Orifice or NetBus). But unlike other hacker tools the DeTroie remote administration tool is spread with the virus code. There exist server and client parts of DeTroie. The server part is spread with the virus. The client part is a standalone application that is used to control computers infected with DeTroie virus. Server and client parts use TCP/IP protocol to communicate with each other.

Being executed the DeTroie virus shows an error dialog pretending to be an innocent application lacking an important DLL (SETUP32.DLL). At the same time the virus copies itself to Windows\System\ directory as MSCHV32.EXE and modifies Windows Registry so it would be executed during every further Windows bootup:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  Load MSchv32 Drv = C:\WINDOWS\SYSTEM\MSchv32.exe

To check whether the computer is already infected the virus adds the following key to the Registry:

HKEY_CLASSES_ROOT\DirectSockets
  DirectSocketsCtrl = $A4 D5 #FFF

The second variant of DeTroie virus installs itself in another way. The error dialog indicates that ISAPI32.DLL is missing. The virus copies itself 3 times to Windows\ and Windows\System\ directories under the following names:

c:\windows\rsrcload.exe
  c:\windows\system\mgadeskdll.exe
  c:\windows\system\csmctrl32.exe

The virus also modifies Windows Registry to make these files be executed on every further Windows bootup:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  Load Mgadeskdll = C:\WINDOWS\SYSTEM\Mgadeskdll.exe
  HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  Load Rsrcload = C:\WINDOWS\Rsrcload.exe
  HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices
  Load Csmctrl32 = C:\WINDOWS\SYSTEM\Csmctrl32.exe

DeTroie has been reported several times in the wild in France.






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