This is a simple, but encrypted direct action virus. It infects only COM files by changing the first 4 bytes of the program to a JMP WORD+an identifier. The virus code is 419 size long which is appended to the of the program. The virus activates on 30th of April each year when it displays the following text and hangs the machine:
NightBird goes, Along with the Queen...
It also contains the text:
*April 30 Virus*
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
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