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Published Apr 29, 2010 | Updated Sep 15, 2017

Trojan:Java/Classloader.X

Detected by Microsoft Defender Antivirus

Aliases: Trojan-Downloader.Java.Agent.aw (Kaspersky) Java/Exploit.gen (Norman) JAVA/Dldr.Agen.AG.2 (Avira) Java/ByteVerify!exploit (CA) Exploit.Java.9 (Dr.Web) Trojan-Downloader.Java.Agent (Ikarus) TROJ_JAVA.AP (Trend Micro)

Summary

Trojan:Java/Classloader.X is the detection for a malicious Java applet that exploits the vulnerability described in CVE-2009-3867. The vulnerability is due to an error in the implementation of the HsbParser.getSoundBank function, which can be exploited to result in a stack-based buffer overflow.
To detect and remove this threat and other malicious software that may have been installed, run a full-system scan with an up-to-date antivirus product such as Microsoft Security Essentials, or the Microsoft Safety Scanner. For more information about using antivirus software, see http://www.microsoft.com/security/antivirus/av.aspx.
Additional recovery instructions
This threat exploits a known vulnerability in Java software. 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 links:
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