Jerk

Classification

Malware

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Jerk

Summary

O97M/Jerk is a polymorphic macro virus that is able to infect both Excel and Word files. It gets control when an infected document is closed or an infected workbook is deactivated.

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

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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 it gets control, it attempts to infect all open workbooks in Excel as well as the Word's global template. After that it infects every Word document that is closed.

The virus activates its payload every 14th day of each month from June to December when user closes an infected document in Word. It displays a message with the title:

Class.Poppy

with the text:

I think (UserName) is a big stupid jerk!

where "(UserName)" is the current user name.


Variant:Jerk.B

This variant is functionally identical with O97M/Jerk.A, only the message is different. The title is:

www.all.net

and the text is:

V guvax (UserName) vf n ovt fghcvq wrex!

where "(UserName)" is the current user name.