Security | Threat Detection | Cyberattacks | DevSecOps | Compliance

Seven things security teams can start doing today to reduce risk.

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.

Ransomware: AI changes the writer. It doesn't change the math. Why most endpoint protection still treats ransomware as just another piece of malware, and what changes when you watch the data instead of the attacker. In 2013, CryptoLocker introduced the modern ransomware playbook. It also introduced something most of the industry has still not come to terms with: remote encryption.

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).

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 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.