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Exploit:JS/Mult.DX


Exploit:JS/Mult.DX is the generic detection for malicious JavaScript code that is found in certain compromised websites. It executes when the user visits the website.



What to do now

To detect and remove this threat and other malicious software that may be installed on your computer, run a full-system scan with an appropriate, up-to-date, security solution. The following Microsoft products detect and remove this threat:

For more information on antivirus software, see http://www.microsoft.com/windows/antivirus-partners/.

Update vulnerable Java applications

This threat exploits a known vulnerability in Java. After removing this threat, make sure that you install the updates available from the vendor. You can read more about this vulnerability in Java, as well as where to download the software update from the following links:

It may be necessary to remove older versions of Java that are still present. Keeping old and unsupported versions of Java on your system presents a serious security risk. To read more about why you should remove older versions of Java, see the following information.

Threat behavior

Exploit:JS/Mult.DX is the generic detection for malicious JavaScript code that is found in certain compromised websites. It executes when the user visits the website.

Exploit:JS/Mult.DX is designed to load another obfuscated JavaScript code to exploit multiple vulnerabilities. The vulnerabilities may include the following:

In the wild, the loaded JavaScript code may lead to a PDF file that exploits vulnerabilities in Adobe Acrobat and Adobe Reader.

Analysis by Jonathan San Jose


Symptoms

There are no common symptoms associated with this threat. Alert notifications from installed antivirus software may be the only symptoms.


Prevention


Alert level: Severe
First detected by definition: 1.113.1622.0
Latest detected by definition: 1.113.1622.0 and higher
First detected on: Oct 13, 2011
This entry was first published on: Oct 13, 2011
This entry was updated on: Nov 02, 2011

This threat is also detected as:
  • Trojan.Exploit.ANSL (BitDefender)
  • Exploit.JS.Mult (Ikarus)