174: Pacific Rim

174: Pacific Rim

May 5, 2026 90m

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Episode Description

For six years, Sophos fought a secret cyber war against a state-backed hacking group targeting its firewalls. This forced Sophos to drastically change tactics to properly secure their firewalls.

Was it ethical? Was it effective? They disrupted nine zero-day attacks, exposed who was hacking them, and forced the hackers to change tactics. But at what cost?

You have to listen to one of the most audacious corporate cyber defenses ever conducted.

Sponsors

Support for this show comes from ThreatLocker®. ThreatLocker® is a Zero Trust Endpoint Protection Platform that strengthens your infrastructure from the ground up. With ThreatLocker® Allowlisting and Ringfencing™, you gain a more secure approach to blocking exploits of known and unknown vulnerabilities. ThreatLocker® provides Zero Trust control at the kernel level that enables you to allow everything you need and block everything else, including ransomware! Learn more at www.threatlocker.com.

This show is sponsored by Meter, the company building networks from the ground up. Meter delivers a complete networking stack - wired, wireless, and cellular - in one solution that’s built for performance and scale. Alongside their partners, Meter designs the hardware, writes the firmware, builds the software, manages deployments, and runs support. Learn more at meter.com.

Support for this show comes from Drata. Drata is the trust management platform that uses AI-driven automation to modernize governance, risk, and compliance, helping thousands of businesses stay audit-ready and scale securely. Learn more at drata.com/darknetdiaries.

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AI-Generated Summary

The Cyber Attack on Sophos Firewalls: An Overview

This section discusses the significant cyber attack campaign against Sophos, spanning several years and involving sophisticated Chinese threat actors. The attacks targeted their firewalls, leading to various zero-day exploits and extensive reconnaissance and infiltration efforts. Sophos’ team responded by developing advanced defenses, including a rare move to deploy hotfixes remotely across their product estate. The narrative emphasizes the audacity and scale of these operations, highlighting the ongoing nature of the threat and the tactics used by nation-state hackers.

Sophos’ Response and Defensive Strategies

This section details how Sophos detected, responded to, and mitigated the attacks. It covers their use of telemetry, threat intelligence, and innovative measures like deploying stealthy implants to monitor hacker activity and develop countermeasures. The story illustrates the internal debates, ethical considerations, and technical challenges faced by the team, including controlling the dissemination of patch information to prevent exploits and deploying hotfixes without customer approval due to the severity of the vulnerabilities.

The Ethical Dilemmas and Strategic Moves in Cyber Defense

Here we explore the ethical gray areas faced by Sophos, such as deploying covert implants and observing attackers’ actions. The decisions were driven by necessity and strategic advantage, raising questions about privacy, transparency, and legality. The segment discusses how Sophos balanced their moral considerations with the need to protect their infrastructure and their customers, emphasizing transparency about their actions and the importance of sharing information openly.

Technical Details of the Attack Campaigns and Threat Actor Tactics

This section provides an in-depth look at the technical methods employed by the threat actors, including exploiting zero-day vulnerabilities, manipulating update mechanisms, developing custom malware and rootkits, and leveraging supply chain attacks. The attack was highly targeted, with exercises in evasion and stealth, including developing BIOS-level bootkits. The narrative illustrates the complexity and resourcefulness of nation-state actors, as well as the meticulous reverse engineering and threat hunting efforts by Sophos.

The Impact and Broader Implications of the Campaigns

This final section reflects on the broader implications of these cyber espionage operations, including the targeting of geopolitical dissidents, defense contractors, and critical infrastructure mainly in the Asia-Pacific region. It discusses the asymmetry of power, the lawless environment of cyberspace, and the challenges faced by security companies battling powerful nation states. The story concludes with a note on the ongoing threat landscape, the importance of transparency, and the need for continuous innovation in cybersecurity defense.