Threat Description

Voronezh

Details

Aliases: Voronezh
Category: Malware
Type: Virus
Platform: W32

Summary


This virus overwrites the beginning of COM files, placing the original code in encrypted form at the end. EXE files are also infected in an unusual way - the original CS:PC is not changed, but the first 5 bytes of the program code are overwritten with a FAR CALL to the virus code.



Removal


Automatic action

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

More

Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

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



Technical Details



Variant:Voronezh-370, Voronezh-600, Chemist

Related viruses, but somewhat shorter, and with a less complex structure - probably older variants. They are only able to infect COM files, not EXE files like the 1600 byte variant.






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