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Do note that there are also clean copies of PCTRSHOW in circulation.
The virus infect only Windows 3.x executables (NE), and it does it without changing the executable entry point. This is an unusual infection method and was first introduced in this virus.
When executed, Shell.10634 searches the directory tree for suitable files to infect. Only EXE and SCR (screen saver) files can get infected.
Also 32bit Win95 and WinNT executables can be infected by the virus, but these files are unable to spread the infection further. Shell not stay resident in memory.
This virus activates by dropping a GIF file, which contains a picture of a Tentacle and text:
I'm the Tentacle Virus!
The author of this virus also wrote the Tentacle and Tentatrickle viruses, which are technically quite different from this virus. See: Tentacle
[Analysis: Mikko Hypponen, F-Secure]