The malicious ad tech purveyor known as VexTrio Viper has been observed developing several malicious apps that have been published on Apple and Google's official app storefronts under the guise of seemingly useful applications. These apps masquerade as VPNs, device "monitoring" apps, RAM cleaners, dating services, and spam blockers, DNS threat intelligence firm Infoblox said in an exhaustive analysis shared with The Hacker News. "They released apps under several developer names, including HolaCode, LocoMind, Hugmi, Klover Group, and AlphaScale Media," the company said. "Available in the Google Play and Apple store, these have been downloaded millions of times in aggregate." These fake apps, once installed, deceive users into signing up for subscriptions that are difficult to cancel, flood…