Summary

Bait-virus was found in Finland during spring 1994. When an infected file is executed, it will infect several COM files in the current directory and change the working directory to \DOS. Infected files will grow by 425 bytes.

The virus encrypts itself with a variable 16-bit key, but the decryption routine is constant, so this virus can be detected with a search string.

The following text is found underneath the encryption:

 
        Bait Virus 2.0. Finland (C) 1994 JH

[Analysis: Mikko Hypponen, F-Secure]