Security | Threat Detection | Cyberattacks | DevSecOps | Compliance

How Corelight identified a years-old network issue in 30 minutes

A global cruise line operating across maritime and resort environments was struggling with inconsistent detections, alert overload, and limited visibility from its existing NDR platform. In this customer story, Jay Miller from Corelight walks through how the organization evaluated its network visibility strategy, identified long-standing gaps in detection coverage, and improved investigation workflows across a complex environment with intermittent connectivity at sea.

GPT-5.5-Cyber is here. What it means for defenders operating at the frontier.

GPT-5.5-Cyber is here. What it means for defenders operating at the frontier. OpenAI’s May 7 release of GPT-5.5 and the limited preview of GPT-5.5-Cyber put frontier AI in verified defenders’ hands. As a member of the Trusted Access for Cyber program, Sophos is using these models to sharpen what we already operate: an agentic SOC that resolves more than half of cases without a human, and an endpoint architecture purpose-built to stop AI-generated zero-days.

Sophos named a Leader in the KuppingerCole Analysts Leadership Compass for Managed Detection and Response 2026

Sophos named a Leader in the KuppingerCole Analysts Leadership Compass for Managed Detection and Response 2026 Sophos recognized across four leadership categories: Overall, Product, Innovation, and Market Sophos has been named an Overall Leader in the 2026 KuppingerCole Analysts Leadership Compass for Managed Detection and Response (MDR).

Donuts and Beagles: Fake Claude site spreads backdoor

A malicious imitation of Anthropic’s Claude site leads to DLL sideloading – and a backdoor As we reported on social media recently, Sophos X-Ops has been investigating reports of a fake Claude AI website distributing malware. Like other researchers, we thought this might be a PlugX-like campaign, given that the attack chain shares several characteristics with observed PlugX attacks.

How AI-accelerated threat discovery is reshaping network security

How AI-accelerated threat discovery is reshaping network security As vulnerabilities are discovered faster than ever, organizations must rethink how they reduce exposure and contain risk at the network edge. Claude Mythos Preview has reignited debate about AI-driven cyber attacks, but the real shift isn’t what AI finds, it’s how quickly issues at the network edge can turn into impact. This post explores what’s changed and how network security must adapt to keep up.

The Hackers Who Left Their Entire Playbook Online

A ransomware group called Warlock tore through more than 60 organisations in six months, targeting the nuclear energy, aerospace, and government sectors. They chain zero-days and neutralise antivirus software using signed Chinese drivers. This is how they operate and how the Sophos CTU tracked them across eleven incidents to expose their full playbook​

CYJAX Launches Compromised Device Alerting to Detect Threats Earlier

Detect compromised devices before attackers act. CYJAX’s new alerting identifies stealer malware infections and exposed credentials in near real time. CYJAX today announced the launch of Compromised Device Alerting, a new capability designed to help organisations identify compromised devices within their environment before attackers can act on stolen credentials.

Episode 14 - Harvest Now, Decrypt Later: The Shift to Post-Quantum Cryptography

The emergence of quantum computing has introduced a definitive expiration date for classical encryption, fueling a "harvest now, decrypt later" strategy among sophisticated nation-state actors. In this episode, Vince Stoffer joins Richard Bejtlich to demystify Post-Quantum Cryptography (PQC) and explain why organizations must move beyond a "set it and forget it" mentality regarding their encryption standards.