malware “Sleeper cells” in telcos seen using novel new BPFdoor malware "Kernel-level packet filtering to bypass multiple layers of modern network defenses" The Stack Mar 30, 2026 - 2 min read Image credit: https://unsplash.com/@paus_d_ Get the full story: Subscribe for free Join peers managing over $100 billion in annual IT spend and subscribe to unlock full access to The Stack’s analysis and events. Subscribe now Already a member? Sign in