Transcript for How to protect yourself from downloading fake appsOkay, we're back with a "Gma" investigation about scammers possibly targeting holiday shoppers. That's why our warning about fake malicious apps is so important to revisit. Reporter: Hackers somehow introduced 50 malicious apps also known as doppelgangers, fake apps that mirror the reel thing into the Google play store and millions of unsuspecting android users downloaded the bad app, a total of 4.2 million times. Reporter: James Lyne is a security adviser at sophos and gave phones to our volunteers as part of our demonstration. Reporter: -- James was live streeping his camera and pinpointing his location.

Source: ABC News November 24, 2017 12:58 UTC