Threat description




The Openconnection is a family of Java applet based trojan downloaders, that infect Internet Explorer through malicous web page that uses Java classloader byteverify exploit or other vulnerability in Internet Explorer.


Update and Removal Instructions

The easiest way to be safe from these trojans is to make sure that Internet Explorer (IE) is up to date.

Note: In some cases, even with an updated browser, the trojans are sometimes downloaded, but they are at least unable to activate.

Technical Details

These trojans usually download other trojan/spyware components on the system.

Installation to system

The Openconnection trojans install themselves from a malicious web page that contains a reference to the trojan.

The trojan uses a vulnerability in the classloader system of Microsoft Java runtime, that allows the malicious applet to break out of the sandbox, and gain same access as any other executable running with users permissions.

Further information about the vulnerability in the Microsoft Java VM, including a fix, is available at:

Submit a Sample

Suspect a file or URL was wrongly detected? Send it to our Labs for further analysis

Submit a Sample

Give And Get Advice

Give advice. Get advice. Share the knowledge on our free discussion forum.

More Info