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Published Oct 13, 2008 | Updated Sep 15, 2017

TrojanDownloader:Java/Classloader.D

Detected by Microsoft Defender Antivirus

Aliases: Java/ByteVerify (AVG) Java.Trojan.Exploit.Bytverify (BitDefender) Java/ByteVerify!exploit (CA) Java/Exploit.Bytverify.B (ESET) Trojan.Java.ClassLoader.i (Kaspersky) Exploit-ByteVerify (McAfee) Java/Byteverify.D (Norman) Exploit/ByteVerify (Panda) Troj/Femad-B (Sophos) Exploit.Java.ClassLoader.k (Sunbelt Software) Trojan.ByteVerify (Symantec) JAVA_BYTEVER.A-A (Trend Micro) Trojan.Java.ByteVer.E (VirusBuster)

Summary

TrojanDownloader:Java/Classloader.D is a malicious Java applet that can infect Microsoft Windows computers that are not patched with Microsoft Security Update MS03-011. An attacker can insert the Java applet into HTML code and host the code on a Web server or send the code in 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 and open a backdoor to receive commands from attackers.
Manual removal is not recommended for this threat. 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 the Microsoft Safety Scanner (http://go.microsoft.com/fwlink/?LinkId=212742). For more information, see http://www.microsoft.com/protect/computer/viruses/vista.mspx.
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