United Kingdom, May 2026: infostealer infections, leaked accounts and ransomware incidents

An assessment based on Dark Radar intelligence data. Infected devices, leaked corporate and customer accounts, active malware families and the targets of ransomware groups in a single report.

Why this report matters

Infostealer infections are often the first step in account takeover and ransomware attacks. The report sets out the infections and leaked accounts observed during the month by sector and domain, so security teams can decide which accounts and systems to address first.

What the report covers

• Infostealers on 3,348 devices and the distribution of 14 malware families
• 1,208 leaked employee and 268,366 customer accounts by sector and domain
• 42,657 domains seen in leaks and their extension classes
• 49 ransomware incidents, the most active groups and the sectors they targeted