Backhand

Threat description

Details

Category:
Platform: W32

Summary

Backhand is a polymorphic Word 97 macro virus which payload simulates the Y2K-problem.



Removal

Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

More scanning & removal options

More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.

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

Contact Support

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



Technical Details

The virus replicates when an infected document is opened, closed or a new one is created.

Backhand.A first disables the build-in macro virus protection. After that it drops its code in a file "sysboot.bin" to the root of "C:" drive and uses it to infect global template and documents.

When infects documents the virus change some of its subroutine names with random ones.

The virus contains a few payloads. First of them activates when the day of the month is 13. Than it saves the active document with a random password and shows a message:

         Your document has been corrupted because of a bug in Word!         Call Microsoft Customer Support, they can help you. When you         call, tell them this Bug-ID Code (don't forget it!)  

If the day is also Friday then Backhand.A shows another message:

          Have A Nice Day!          It's Friday 13th! This is my lucky day, I hope it's          yours too!  

The last payload activates in year 2000 or later when Backhand.A change the system date to January 1st 1980.





Technical Details: Katrin Tocheva, F-SECURE


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