English
The Internet threat alert status is currently normal. At present, no major epidemics or other serious incidents have been recorded by Kaspersky Lab’s monitoring service. Internet threat level: 1

Trojan-Downloader.Win32.Small.ksm

Detected Aug 01 2010 14:23 GMT
Released Aug 01 2010 23:39 GMT
Published Oct 25 2010 09:27 GMT

Technical Details
Payload
Removal instructions

Technical Details

This Trojan is designed to install and launch other programs on the victim machine without the knowledge or consent of the user. It is a Windows application (PE EXE file). It is 14 848 bytes in size. It is written in C++.


Payload

Once launched, the Trojan decrypts its body and downloads files from the following URLS:

http://188.***.161/varag_sdfgkwlkgadfshn.exe
http://85.***.111/bat.exe
At the time of writing, these links were inactive. The Trojan saves the downloaded files under the following names respectively:
%WinDir%\Temp\_ex-68.exe
%WinDir%\Temp\_ex-08.exe
It then launches the downloaded files for execution and ceases running.


Removal instructions

If your computer does not have antivirus protection and has been infected by this malicious program, follow the instructions below to delete it:

  1. Delete the original Trojan file (its location will depend on how the program originally penetrated the infected computer).
  2. Delete the following files:
    %WinDir%\Temp\_ex-68.exe
    %WinDir%\Temp\_ex-08.exe
    
  3. Perform a full scan of the computer using Kaspersky Anti-Virus with up-to-date antivirus databases (download a trial version).


MD5: E58B6BDF6531B471EEC9EFDCFA70E8FF
SHA1: 0A38BF1115039370803B3FDC80D17BC0E25CA47D


Bookmark and Share
Share
Trojan-Downloader

Programs classified as Trojan-Downloader download and install new versions of malicious programs, including Trojans and AdWare, on victim computers. Once downloaded from the Internet, the programs are launched or included on a list of programs which will run automatically when the operating system boots up.

Information about the names and locations of the programs which are downloaded are in the Trojan code, or are downloaded by the Trojan from an Internet resource (usually a web page).

This type of malicious program is frequently used in the initial infection of visitors to websites which contain exploits.


Other versions

Aliases

Trojan-Downloader.Win32.Small.ksm (Kaspersky Lab) is also known as:

  • Trojan-Dropper.Win32.HDrop.jc (Kaspersky Lab)
  • TrojanDownloader:Win32/Waledac.C (MS(OneCare))
  • Trojan-Downloader.Win32.Waledac (Ikarus)
  • TR/Crypt.ZPACK.Gen (AVIRA)
  • W32/Bredolab.B!genr (Norman)