Beware of Free VPNs that Install Malicious Botnets

**911 S5 botnet exploited malicious free VPN apps to convert millions of user devices into proxy servers used for large-scale cybercrime, causing multi-billion dollar victim losses and spanning 19 million IPs across 190+ countries; the report lists infected app names, the malicious libraries/SDKs (ProxyLib, LumiApps), and persistence via alternative app stores.**