Summer 2025 wasn't just hot; it was relentless.
Ransomware hammered hospitals, retail giants suffered data breaches, insurance firms were hit by phishing, and nation-state actors launched disruptive campaigns.
From stealthy PowerShell loaders to zero-day SharePoint exploits, attackers kept defenders on their heels.
This report breaks down the season's most high-impact incidents and what security teams need to do before the next wave hits.
Summer Expose Healthcare's Growing Ransomware Risk
Hospitals can't afford downtime, and attackers know it.
This summer, ransomware groups targeted healthcare, exploiting both the value of patient data and the urgency of care.
Interlock rises as a major threat to US healthcare
A July 22, 2025, joint advisory by CISA, FBI, and HHS highlighted Interlock as a major threat to the Healthcare and Public Health (HPH) sector. The group is linked to around 14 incidents in 2025 alone, with a third affecting only healthcare providers.
What sets Interlock apart is its use of "FileFix," a PowerShell launcher that hides malicious scripts behind decoy file paths. It tricks users into running payloads through File Explorer, bypassing typical security detections.
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