Trojan-Downloader.Win32.Small.bven

Technical Details
Payload
Removal instructions

Technical Details

A trojan program that downloads files from the internet without the user's knowledge and launches them. It is a Windows application (PE-EXE file). 7168 bytes. Written in C++.

Installation

When launching, the trojan copies its executable file under the following name:

%WinDir%\System\svchost.exe

So that it may be automatically launched each time the system is started, the trojan adds a link to its executable file in the system registry startup key:

[HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
"svchost.exe"="%WinDir%\System\svchost.exe"

Payload

When launching, the trojan looks for and carries out the following processes within the system:

NaverAgent.exe
Nsavsvc.npc
nsvmon.npc
NVCAgent.npc
Vcrmon.exe
SpiderNt.exe
SpiderUI.exe
AYAgent.aye
AYServiceNT.exe

The trojan then downloads 4 files from the following links:

http://www.j***utl.info/gx2/x4.txt
http://www.i***ef.info/gx/x3.txt
http://www.g***fj.info/xztj/22.txt
http://www.o***rh.info/xztj1/12.txt

These links did not work when creating the description.

The downloaded files are saved in the current user's temporary file directory under the following names:

%Temp%\<rnd>.exe

Where <rnd> – random digits.

The downloaded files are then launched and the trojan shuts down. The trojan is deleted when reloading the original file.

Removal instructions

If your computer has not been protected with anti-virus software and has been infected with malware, you will need to take the following actions to delete this:

1. Delete the original program file (its location on the infected computer will depend on how the program got onto the computer).
2. Delete the files downloaded by the trojan located in the current user's temporary file directory under the following names.
3. Delete the system registry key (how to work with the registry?):

   [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
   "svchost.exe"
   

4. Run a full Kaspersky Antivirus scan of the computer with updated antivirus databases (download trial version).