Trojan-Downloader:Java/Openstream, Exploit:Java/openstream


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.

Automatic action

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.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

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User Guide

See the user guide for your product on the Help Center.

Contact Support

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Submit a sample

Submit a file or URL for further analysis.

Technical Details

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: