It traces INT 13h and 21h, hooks INT 21h and writes itself to the end of .EXE and .COM files, that are executed. On Tuesdays it overwrites files with a program executed displaying:
Hi! My name is Neko. It is a Japan name. When you see me , please do not worry. New i am a very kind and cute virus. I only kill your this file. But next time i will kill you all. I will be com back and become fierce. Neko version 1.0
There is a variant (Version 2.0) that displays the following message:
Dear, Mrs.Grandy: Aloha! It is me, Neko again! This is the latest version 2.0 Undoubtedly, I am not what I was. Let me tell you something about my improvement. I work with the Antilogic Engine I. It is a new invention. So, Showtime! Neko Version 2.0 Made by Metal Satan
This variant has in infection size of 4894 Bytes. Instead of the original 2518 Bytes.