A while ago I was playing with the idea on how to create a virus on *nix. After some thought I found a shar file quite effective.
Heck, you can get it to extract and, more importantly, execute all sorts of crazy things
You are absolutely right. Of course you need to look at what you are running. You and I probably will. You can assume someone to open an jpg with some viewer. You can assume a diff will be used with patch. But you can be dead sure someone will run a shar. Without looking. Most infections these days happen because people run all sorts of things, completely oblivious.
It's quite easy to extract and run pre-compiled (or compile them on the spot) executables with a shar. Of course, the same can be said for shell scripts. But shell scripts are readable to a certain extent and are expected to be so. A shar on the other hand is expected to contain a lot of gobble-di-goo (/me lacks a better word). That makes it relatively easy to hide things in plain sight :e
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