What are BPFDoor variants and how do they work?

BPFDoor variants are kernel-level Linux backdoors using Berkeley Packet Filters to monitor traffic for magic packets. New ones like httpShell and icmpShell tunnel C2 over HTTP/ICMP, evading traditional detection.

How to detect BPFDoor on my systems?

Use Rapid7's rapid7_bpfdoor_check.sh script—it checks active BPF filters and masqueraded processes. Also deploy their YARA/Suricata rules from Intelligence Hub.

Are BPFDoor variants a telecom-only threat?

Primarily telecom so far, but kernel persistence makes them portable. Expect spread to cloud and enterprise Linux environments.

🦠 Ransomware & Malware

BPFDoor's Sneaky Upgrade: Seven New Variants Dodge Defenses in Telecom Backbones

Kernel-level backdoors just got craftier. Rapid7's latest whitepaper reveals seven BPFDoor variants that blend into telecom traffic like ghosts in the machine.

CVE Watch Apr 11, 2026 4 min read

Diagram showing new BPFDoor magic packet structure with hidden IP and offsets

⚡ Key Takeaways

Rapid7 identified 7 new BPFDoor variants, including httpShell and icmpShell, with enhanced stealth via disk persistence and dynamic triggers. 𝕏
Detection relies on structural anomalies like ICMP sequences, not payloads; use Rapid7's triage script for checks. 𝕏
Telecom networks remain prime targets, but evolution signals broader Linux risks—kernel audits essential. 𝕏

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#BPFDoor #BPFDoor variants #Rapid7 research #kernel backdoor #telecom malware #telecom threats #threat intelligence

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Originally reported by Rapid7 Blog

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