NowSecure, a provider of privacy- and security-testing solutions for mobile apps, has raised $15 million in venture capital. : The growth in popularity of mobile apps hasn’t kept pace with app security improvements — quite the opposite. It’s estimated that roughly 63% of so-called grayware apps leak phones’ mobile numbers and that 62% of the top VPN apps request dangerous or unusual permissions. Researchers at Symantec found in a recent study that the number of new mobile malware variants increased by 54% in 2017 over 2016’s numbers.