Threat Description

Ouch

Details

Category: Malware
Platform: W32
Aliases: 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

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.



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





Description Details: Jarno Niemela, September 2nd, 2003
Description Last Modified: Jarno Niemela, January 12th, 2004


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