The company has said it plans to launch four more smartphone games by the end of March 2017.
In order to install the malicious Pokemon GO app the gamer needs to "side-load" it by disabling an Android security setting.
Muggers aren't the only threat to Pokemon Go players.
Nintendo shares appreciated 24.5% on the Tokyo exchange today, and are up more than 30% including Friday, following the release of the free-to-play app in the U.S., Australia, and New Zealand.
The popularity of "Pokemon Go" has strained the servers running the game and led Niantic to slow its rollout.
The official Pokemon GO app was first launched in Australia and New Zealand on July 4th, and later on July 6th in the US, but the malicious app was first uploaded to an online malware detection repository on July 7. The app is free to download for Android and iOS, but it also features in-app purchases.
"They'll either use remote locations that players might go to or even put things into this digital reality that would entice people to come to a place where they could be more easily victimized", Heck says. Since the app launched, dozens of people at a time have been showing up at his house and milling about, playing the game at all hours of the night.
For those who don't know, the new Pokemon app uses the phone's built in Global Positioning System to tell the player where various Pokemons (Pokemen?) are in the physical world.
Apple has hundreds of thousands of apps available on the App Store - but what you can get depends on what country you're based in.
The colorful characters' invasion of the real world has had some real-world consequences. One person has already found a dead body using the app. Early reports were that Pokemon GO will be released in the UK, Ireland and Netherlands before the end of this week.
Nintendo doesn't publish the game, but it's an investor in and partner of the company that does: Niantic Labs, which spun out of Google previous year, released the game in the US on July 6, where it immediately shot to the top of the free chart on Apple's iTunes App Store.