United Kingdom
United Kingdom Infostealer Threat Report — May 2026
05/01/2026 – 05/31/2026
Threat summary
Key figures from the month's threat activity.
Overview
Most common malware family: REMUS (27.9% of infections). Sector with the most employee account leaks: Education. Leaked accounts rose by 15.2% compared with the previous month.
Ransomware victims in United Kingdom3,348
infected devices · from 10 families
Report periodMay 1, 2026 - May 31, 2026
Risk score
58+22vs previous month
- Infected devices
- 3,348
- Android devices
- 1,003
- Domains
- 42,657
- Employee accounts
- 1,208
- Customer accounts
- 268,366
- Families
- 10
Top 10 malware families
infections- 1REMUS935
- 2PUREV4750
- 3VIDAR379
- 4REDLINE377
- 5LUMMAC285
- 6SHUB STEALER108
- 7ARKEI42
- 8ELYSIUM STEALER39
- 9SHAPESHIFTER35
- 10STEALC23
The full list is in the PDF reportDownload report
Top 10 antivirus
infected devices- 1Windows Defender874
- 2Reason Cybersecurity52
- 3Norton 360 for Gamers21
- 4Total AV10
Breakdown of leaks
Breakdown by sector, file type and critical system.
Employee accounts by sector
organizationsrecordsRansomware victimsemployee accounts- 1Education112organizations16.3Krecords3Ransomware victims430employee accounts
- 2Technology28organizations67.3Krecords5Ransomware victims65employee accounts
- 3Telecommunications3organizations2.2Krecords–Ransomware victims39employee accounts
- 4Gaming and betting5organizations15.4Krecords–Ransomware victims19employee accounts
- 5Retail and e-commerce8organizations25.3Krecords4Ransomware victims17employee accounts
- 6Nonprofit6organizations2.7Krecords–Ransomware victims14employee accounts
- 7Healthcare7organizations2.2Krecords3Ransomware victims11employee accounts
- 8Manufacturing and industry5organizations1.4Krecords6Ransomware victims7employee accounts
- 9Professional services3organizations851records17Ransomware victims6employee accounts
- 10Finance4organizations12.4Krecords–Ransomware victims5employee accounts
The full list is in the PDF reportDownload report
Report contents
Sections and pages of the full report.
Contents
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