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TrojanDownloader:Java/OpenConnection.ES


TrojanDownloader:Java/OpenConnection.ES is the detection for an obfuscated Java class that is part of a bundled malicious Java applet. The applet exploits the vulnerability described in CVE-2008-5353 and can be used to download and run arbitrary files from a malicious website.


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/.

Threat behavior

TrojanDownloader:Java/OpenConnection.ES is the detection for an obfuscated Java class that is part of a bundled malicious Java applet. The applet exploits the vulnerability described in CVE-2008-5353 and can be used to download and run arbitrary files from a malicious website.
Installation
OpenConnection.ES may be encountered when visiting a malicious webpage. The exploit consists of the following Java class files:
 
 
Successful exploitation of  CVE-2008-5353 on vulnerable system allows the downloader Trojan to be invoked with elevated privilege and do the following:
  • Downloads arbitrary file from a remote site as "%TEMP%\<random file name>.EXE"
  • Executes the downloaded binary
 
Analysis by Rodel Finones

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: 1.87.1452.0
Latest detected by definition: 1.151.1570.0 and higher
First detected on: Aug 07, 2010
This entry was first published on: Sep 02, 2010
This entry was updated on: Apr 17, 2011

This threat is also detected as:
  • Java/Agent.M.2 (Avira)
  • Exploit.Java.87 (Dr.Web)
  • Java/TrojanDownloader.OpenStream.NAO (ESET)
  • Trojan-Downloader.Java.Agent.fu (Kaspersky)
  • Exploit-CVE2008-5353 (McAfee)
  • Troj/JavaDl-AA (Sophos)
  • TROJ_JAVADL.A (Trend Micro)