Iphone 5 charging problem - Malware virus.

Hello Guys.

I have a big problem with my Iphone 5 and i think it has something to do, with the recent discovered malware charching virus. http://edition.cnn.com/2013/06/03/tech/mobile/hack-iphone-charger

It started a few weeks ago when my old charger was broken, and i was in big need. I borrowed my friends charger, which was a "fake" cheap one. It worked perfectly the first few days, but then suddentlig it would not charge. When im charging it shows "the full battery symbol", but it aint full and it aint charge. It goes slowly to 0%. Then its out of battery, but the "lightning symbol" shows. Anyway it still doesnt charge and suddently its just black and completely out of battery. Then i can wait for 6, 12 and sometimes even 24 hours and then its turned on again. Maybe its charged for like 60% and the full charged battery appears. Sometimes it works normal, but then suddently its like described at the above again. I have bought a new charger and tried my friends chargers, but still the same problem. I send it for rep. and they did some research, but they could not find any problems with the battery. However i got a new Iphone 5 because of a speaker problem at the phone. I started the new iphone "as a new iphone", because i feared it was something with my apple ID or something. It still doesnt work and i have tried nearby everything. Therefore i think its some virus as described in the link, but i still dont know what to do. If anyone has the same problem, have an idea or knows how to erase a malware charging virus at iphone 5, PLEASE help.

I really hope for a genius in here.