Using a generic lightning cable problem

Good day.

I am using a generic lightning data cable to charge for a while now. my problem arose just yesterday after i charged my iphone 5 using the said cable. after charging and disconnecting my phone, this message keeps popping out "This cable or accessory is not certified and may not work reliably with this iPhone". it appears everywhere and frequently. it's annoying. really.

then this morning, i plugged my phone to my MAcbook Air, for a few minutes it was charging but my Mac suddenly shut down! i disconnected my iphone, powered on my Mac and tried again. same thing. My Mac shut down!

Could this be a "virus", malware, worm? whatever it is, please do help me.

Thank you