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TrojanDownloader:Java/OpenConnection.IT


TrojanDownloader:Java/OpenConnection.IT is the detection for an obfuscated Java applet that attempts to download and execute files from a remote web site. It often works in conjunction with Exploit:Java/CVE-2010-0094, which exploit a vulnerability in the Java Runtime Environment (JRE).


What to do now

To detect and remove this threat and other malicious software that may be installed in your computer, run a full-system scan with an up-to-date antivirus product such as the following:
 
 
For more information on antivirus software, see http://www.microsoft.com/windows/antivirus-partners/.
Additional recovery instructions
This threat exploits a known vulnerability in the Java Runtime Environment (JRE). After removing this threat, make sure that you install the updates available from the vendor. You can read more about this vulnerability from the following link:
 
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.
Additional removal instructions
This threat may be present in your Temporary Internet Files folder. We recommend that you delete your temporary Internet files to prevent the persistent detection of this threat from within the Temporary Internet Files folder.
 
To delete the temporary Internet files from Internet Explorer, refer to the following articles:

Threat behavior

TrojanDownloader:Java/OpenConnection.IT is the detection for an obfuscated Java applet that attempts to download and execute files from a remote web site. It often works in conjunction with Exploit:Java/CVE-2010-0094, which exploit a vulnerability in the Java Runtime Environment (JRE).
 
Successful exploitation of the affected computer allows attackers to bypass applet sandbox restrictions and gain read and write access to the local file system.  When the malicious applet is loaded, it attempts to do the following:
  • Download a file from a remote Web site
  • Save the downloaded file as %TEMP%\<random number>.exe
  • Run the downloaded file
 
The downloaded file is arbitrary.
 
Analysis by Wei Li

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: 1.95.1449.0
Latest detected by definition: 1.151.1570.0 and higher
First detected on: Dec 09, 2010
This entry was first published on: Dec 15, 2010
This entry was updated on: Apr 17, 2011

This threat is also detected as:
  • JAVA/Agent.E (Avira)
  • Java.Downloader.144 (Dr.Web)
  • Trojan-Downloader.Java.OpenStream.ay (Kaspersky)