Variants in the Trojan-Downloader:Java/Openstream family are Java applet-based programs that when executed will download and install additional files onto the system.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
Openstream variants typically arrive in a Java JAR file, which the user may need to install and execute before it can perform its silent downloading routine. For a representative example of an Openstream malware, please see the Openstream.T description.
Openstream variants may also be silently installed on the system if the system has a Java installation with a known, unpatched vulnerability that may be exploited. For more information about Java exploits, please see:
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