Backhand
Threat description
Details
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.
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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.
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