Hackers have infected thousands of Android phones and smart TVs, turning the devices into Monero miners. Chinese cyber security firm 360Netlab announced that the attack affected more than 7,000 devices in China by taking advantage of an open port 5555. The report says that scan traffic for port 5555 is growing rapidly as the ADB.Miner worm spreads. The researchers told ZDNet the hackers weren't opening the port themselves, which would have been a much more worrying attack. "The 5555 ADB interfaces of those devices have already been opened before [they're] infected," the researchers said. "We have no idea about how and when this port was opened yet."