It infects the Master Boot Record of the hard drive and writes itself to the end of COM and EXE files that are executed (with exception of COMMAND.COM).
Payload is launched from infected MBR on 13th of any month, begins with visual effect and after that it shows this message:
"I am he Midnigh Pr0wler, s0n 0f he m00n And I am the child 0f he ## genera i0n...."
Note: "##" character is actually virus generation number.
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Prowler (1543 and 1727) are relatively harmless, memory resident encrypted multipartite viruses...