We're gradually updating threat actor names in our reports to align with the new weather-themed taxonomy. Learn about Microsoft threat actor names
TrojanDropper:Java/Beyond.gen!A
Detected by Microsoft Defender Antivirus
Aliases: Trojan.Java.ClassLoader.k (Kaspersky) Exploit-ByteVerify (McAfee) Trojan.ByteVerify (Symantec) JAVA_BYTEVER.DO (Trend Micro)
Summary
TrojanDropper:Java/Beyond.gen!A is a generic detection for malicious Java applets, that often work in conjunction with Java/Classloader and Java/Bytverify, that attempt to exploit a vulnerability in the Microsoft Virtual Machine (VM). This flaw enables attackers to execute arbitrary code on a user's machine such as writing, downloading and executing additional malware. This vulnerability is addressed by update MS03-011, released in 2003.
An attacker can insert the Java applet into HTML code which can then be distributed via malicious web sites or sent in an e-mail. When a user opens the malicious web page or e-mail, the vulnerability allows the applet to bypass a security check on the computer. The applet can then run malicious code on the computer.
Manual removal is not recommended for this threat. Use Microsoft Security Essentials or another up-to-date scanning and removal tool to detect and remove this threat and other unwanted software from your computer. For more information on Microsoft security products, see http://www.microsoft.com/protect/products/computer/default.mspx.
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