Windows Defender detects and removes this threat.

This threat uses a software vulnerability to download and run other files on your PC, including malware.

It runs when you visit a hacked website and you have a vulnerable version of Java. Legitimate websites can also be hacked to unwillingly host this threat.

Oracle Java SE JDK and JRE 7 and 6 Update 27 and earlier are all vulnerable to this threat.

To check if you're running a vulnerable version of Java:

1. Go to the control panel (Select Start then Control Panel)
2. Select Programs. If Java is installed you will see it in the list of installed programs. Click it to open the Java Control Panel.
3. On the General tab, click About to see which version of Java you have installed.

You may get a detection for this threat when you visit a website that has the malicious code, even if you're not using a vulnerable version of Java. This doesn't mean that you have been compromised, it means an try to compromise your PC has been made.

The vulnerability that this threat exploits is described in CVE-2011-3544.

Exploit:Java/CVE-2011-3544 is a family of malicious Java applets that attempt to exploit a vulnerability in the Java Runtime Environment (JRE) in order to download and install files of an attacker's choice onto your computer.

If you visit a website containing the malicious code while using a vulnerable version of Java, Exploit:Java/CVE-2011-3544 is loaded. It then attempts to download and execute files from a remote host/URL; the files that are downloaded and executed could include additional malware.

Oracle Java SE JDK and JRE 7 and 6 Update 27 and earlier are all vulnerable to this exploit.

Exploit:Java/CVE-2011-3544.AV is a detection for a malicious Java applet stored within a Java Archive (.JAR) that attempts to exploit a vulnerability in a Java Runtime Environment (JRE) component in Oracle, JAVA SE JDK and JRE 7, 6 update 27 and earlier. The vulnerability, discussed in CVE-2011-3544, allows an unsigned Java applet to gain elevated privileges and potentially have unrestricted access to run arbitrary Java code outside of the "sandbox" environment.

Exploit:Java/CVE-2011-3544.L is the detection for a malicious Java applet stored within a Java Archive (.JAR) that attempt to exploit a vulnerability in Java Runtime Environment (JRE) component in Oracle Java SE JDK and JRE 7, 6 Update 27 and earlier. The vulnerability is referred to as CVE-2011-3544 allows an unsigned Java applet to gain elevated privileges and potentially have unrestricted access to run arbitrary Java code outside of the "sandbox" environment.

Exploit:Java/CVE-2011-3544.U is a detection for a malicious Java applet stored within a Java Archive (.JAR) that attempts to exploit a vulnerability in a Java Runtime Environment (JRE) component in Oracle, JAVA SE JDK and JRE 7, 6 update 27 and earlier.

More information about the vulnerability is available in the following articles:

• CVE-2011-3544
• Oracle Java SE Critical Patch Update Advisory - October 2011

Exploit:Java/CVE-2011-3544.E is a detection for a malicious Java applet stored within a Java Archive (.JAR) that attempts to exploit a vulnerability in a Java Runtime Environment (JRE) component in Oracle, JAVA SE JDK and JRE 7, 6 update 27 and earlier. The vulnerability, discussed in CVE-2011-3544, allows an unsigned Java applet to gain elevated privileges and potentially have unrestricted access to run arbitrary Java code outside of the "sandbox" environment.

Exploit:Java/CVE-2011-3544.A is a malicious Java applet stored within a Java Archive (.JAR) file. It attempts to exploit a vulnerability in the Java Runtime Environment (JRE) component in Oracle JAVA SE JDK and JRE 7, 6 Update 27 and earlier. The vulnerability allows an unsigned Java applet to gain elevated privileges and potentially have unrestricted access to run arbitrary Java code outside of the "sandbox" environment.

More information about the vulnerability is available in the following articles:

• CVE-2011-3544
• Oracle Java SE Critical Patch Update Advisory - October 2011

Exploit:Java/CVE-2011-3544.BU is a detection for the obfuscated Java applet stored within a Java Archive (.JAR) that attempts to exploit a vulnerability in a Java Runtime Environment (JRE) component in Oracle, JAVA SE JDK and JRE 7, 6 update 27 and earlier. The vulnerability, discussed in CVE-2011-3544, allows an unsigned Java applet to gain elevated privileges and potentially have unrestricted access to run arbitrary Java code outside of the "sandbox" environment.

Exploit:Java/CVE-2011-3544.T is a malicious Java applet stored within a Java Archive (.JAR) file. It attempts to exploit a vulnerability in the Java Runtime Environment (JRE) component in Oracle JAVA SE JDK and JRE 7, 6 Update 27 and earlier. The vulnerability allows an unsigned Java applet to gain elevated privileges and potentially have unrestricted access to run arbitrary Java code outside of the "sandbox" environment.

More information about the vulnerability is available in the following articles:

• CVE-2011-3544
• Oracle Java SE Critical Patch Update Advisory - October 2011

Exploit:Java/CVE-2011-3544.O is a malicious Java applet stored within a Java Archive (.JAR) file. It attempts to exploit a vulnerability in the Java Runtime Environment (JRE) component in Oracle JAVA SE JDK and JRE 7, 6 Update 27 and earlier. The vulnerability allows an unsigned Java applet to gain elevated privileges and potentially have unrestricted access to run arbitrary Java code outside of the "sandbox" environment.

More information about the vulnerability is available in the following articles:

• CVE-2011-3544
• Oracle Java SE Critical Patch Update Advisory - October 2011

Exploit:Java/CVE-2011-3544.N is a malicious Java applet stored within a Java Archive (.JAR) file. It attempts to exploit a vulnerability in the Java Runtime Environment (JRE) component in Oracle JAVA SE JDK and JRE 7, 6 Update 27 and earlier. The vulnerability allows an unsigned Java applet to gain elevated privileges and potentially have unrestricted access to run arbitrary Java code outside of the "sandbox" environment.

Exploit:Java/CVE-2011-3544.gen!A is a generic detection for a malicious Java applet stored within a Java Archive (.JAR) that attempts to exploit a vulnerability in a Java Runtime Environment (JRE) component in Oracle, JAVA SE JDK and JRE 7, 6 update 27 and earlier. The vulnerability, discussed in CVE-2011-3544, allows an unsigned Java applet to gain elevated privileges and potentially have unrestricted access to run arbitrary Java code outside of the "sandbox" environment.

Exploit:Java/CVE-2011-3544.gen!B is a generic detection for a malicious Java applet stored within a Java Archive (.JAR) that attempts to exploit a vulnerability in a Java Runtime Environment (JRE) component in Oracle, JAVA SE JDK and JRE 7, 6 update 27 and earlier. The vulnerability, discussed in CVE-2011-3544, allows an unsigned Java applet to gain elevated privileges and potentially have unrestricted access to run arbitrary Java code outside of the "sandbox" environment.

Exploit:Java/CVE-2011-3544.BS is a detection for the obfuscated Java applet stored within a Java Archive (.JAR) that attempts to exploit a vulnerability in a Java Runtime Environment (JRE) component in Oracle, JAVA SE JDK and JRE 7, 6 update 27 and earlier. The vulnerability, discussed in CVE-2011-3544, allows an unsigned Java applet to gain elevated privileges and potentially have unrestricted access to run arbitrary Java code outside of the "sandbox" environment.