Storm-2603 Using Custom Malware That Leverages BYOVD to Tamper with Endpoint Protections

A newly identified threat actor designated Storm-2603 has emerged as a sophisticated adversary in the ransomware landscape, leveraging advanced custom malware to circumvent endpoint security protections through innovative techniques. The group first gained attention during Microsoft’s investigation into the “ToolShell” campaign, which exploited multiple SharePoint Server vulnerabilities including CVE-2025-49704, CVE-2025-49706, CVE-2025-53770, and CVE-2025-53771. Unlike established […]

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