[hippich]

actually, i personally witnessed C&C based on BBS :)

[dragontamer]

Sounds like a blogpost you should share with everyone :-)

[nissehulth]

Fidonet, in some obscure distributed echomail area? :)

[hippich]

No, actual BBS with software running, processing uploaded files, and software running on machines calling in at night. It was proof of concept and not malicious, but rather fun exercise :) It was too long time ago, the only thing I remember now is that BBS software was ProBoard, and bot was spread via demo .exe file using fidonet echo :)