Zonked is normal direct action COM infector virus. It modifes 5 bytes at the beginning of the program to point to the end of the file where the rest of the virus is placed.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
When an infected program gets executed the virus checks the date. On 1st of January and 31st of December the virus displays this message:
La multi ani, piratilor !
Otherwise the virus does nothing but spreads itself.