Ouch

Classification

Malware

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Ouch, Java/Ouch.A

Summary

Ouch.A is a Java applet based trojan that downloads and installs WinShow (winshow.dll) spyware on the system.

Ouch activates when user views a web page or HTML email that contains reference to the trojan file.

Ouch does not replicate and does not infect the host system, the only operations it does is to download and install WinShow spyware component.

Removal

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.

Find out more

Knowledge Base

Find the latest advice in our Community Knowledge Base.

User Guide

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

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

Technical Details

When a JAR file containing the trojan is executed it uses Microsoft Internet Explorer VerifierBug vulnerability to get full privileges by escaping the Java security, and execute its code. Then the trojan downloads the winshow.dll into windows directory (default C:\Windows) and registers it with regsvr32.

To remove Ouch.A from your system apply the fix to the Java VM vulnerability and clear temporary Internet files cache

Further information about the vulnerability in the Microsoft Java VM, including a fix, is available at:

https://www.microsoft.com/technet/security/bulletin/ms03-011.asp