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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.JS.Agent.egv

Detected Jul 01 2009 10:59 GMT
Released Jul 22 2009 14:51 GMT
Published Sep 26 2011 12:40 GMT

Technical Details
Payload
Removal instructions

Technical Details

A trojan program that downloads other software to the computer without the user's knowledge and launches this software for execution. It is a HTML document containing Java Script. 16506 bytes.


Payload

After opening the infected page, the trojan uses Java Script to decipher the obfuscated code and then launches the malicious script for execution. If the trojan was launched in MS Internet Explorer – using ActiveX object "Microsoft.XMLHTTP", it tries to download the file from the following URL:

http://neiro***09.com/check/vers155.php
and then, using ActiveX object "ADODB.Stream", it saves the file under the following name:
%WinDir%\Fonts\iedr.exe
Furthermore, using the vulnerability in MDAC (Microsoft Data Access Components) in ActiveX object "RDS.DataSpace" (MS06-014), and using ActiveX object "Microsoft.XMLHTTP", the trojan tries to download the file from the following URL:
http://neiro***09.com/check/vers155.php?q=2
Using ActiveX object "ADODB.Stream", it saves the file under the following name:
%Temp%\ieur2.exe
After successful download, the files are launched for execution. These links did not work when creating the description. The trojan then displays the following strings in the browser:
please check url
Error: fzf


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 trojan file (its location on the infected computer will depend on how the program got onto the computer).
  2. Delete the following files:
    %WinDir%\Fonts\iedr.exe
    %Temp%\ieur2.exe
    
  3. Disable the vulnerable ActiveX objects (How to stop launching the ActiveX control element in the Internet Explorer browser).
  4. Install the following updates:
    http://www.microsoft.com/technet/security/Bulletin/MS06-014.mspx
  5. Run a full Kaspersky Antivirus scan of the computer with updated antivirus databases (download trial version).

MD5: b3c642e6858ee72f6a21530a5d3566ab
SHA1: a5f905a7e0fe8f50916a888bd1b526e2125b51a2


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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.JS.Agent.egv (Kaspersky Lab) is also known as:

  • Hoax.JS.Agent.egv (Kaspersky Lab)
  • Trojan-Proxy.JS.Agent.egv (Kaspersky Lab)
  • VBS:Psyme-AF [Trj] (AVAST)
  • Trojan-Downloader.JS.Agent (Ikarus)
  • JS/Downloader.Agent (AVG)
  • HTML/Crypted.Gen (AVIRA)
  • JS_AGENT.AUWM (TrendMicro)