2025 Cybersecurity Incident Post-Mortem: BPFDoor, Double Ransomware, and the Collapse of Fundamentals
An engineering retrospective on the biggest breaches of 2025—from distributed credential stuffing and Ivanti VPN zero-days with BPFDoor stealth backdoors to double ransomware infections and edge hardware compromises.
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Table of Contents
- "Looking Back on an Unusually Heavy Year in SecOps"
- 1. Executive Summary: The 4 Defining Breach Archetypes of 2025
- 2. Technical Deep Dive: How the Defenses Failed and How to Harden Them
- ① February: 1.58 Million Accounts Breached — The Evolution of Credential Stuffing
- 🔍 Why Legacy WAF IP Rate-Limiting Failed
- ② April: Perimeter VPN Vulnerabilities and the 'BPFDoor' Kernel Backdoor
- 🔍 How BPFDoor Evaded Detection for Over a Year
- 🛡️ Hunting BPFDoor on Production Linux Servers
- 1. Inspect /proc/net/packet for active AF_PACKET raw sockets (type=3)
- Map socket inodes back to running PIDs:
- 2. List processes with attached Berkeley Packet Filters (SO_ATTACH_FILTER)
- 3. Detect masquerading processes executing from unlinked/deleted binaries in RAM
- ③ June & August: Hit by Ransomware Twice in Two Months — Why Backups Failed
- 🛡️ The '3-2-1-1-0' Immutable Backup Architecture
- ④ November: Compromised Femtocells and the High Cost of Concealment
- 3. Three Engineering Principles to Carry Forward
- 1. Master the Boring Fundamentals Before Chasing 'AI Security'
- 2. Design for 'Assume Breach' (Zero Trust in Practice)
- 3. Security Posture is a Leadership Decision
- Wrapping Up
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