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Trojanized CPUID HWMonitor Installer Delivers Fileless .NET Payload via Obfuscated IPv6 Scriptlet

ID: fc1ff62c-0a8e-565f-a7eb-02c3ce35509f

STIX ID: report--fc1ff62c-0a8e-565f-a7eb-02c3ce35509f

Feed Name: LevelBlue SpiderLabs Blog

Threat Score
75/100

Date Published: 2026-04-10

Date Updated: 2026-04-28

Author: Sean Shirley

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This report analyzes a trojanized CPUID HWMonitor installer used to deliver a sophisticated, multi-stage fileless malware chain that abuses trusted Windows utilities (PowerShell, MSBuild, regsvr32) and .sct scriptlets to reconstruct and deserialize a .NET payload from obfuscated IPv6-style strings for in-memory execution; it provides technical details, defensive recommendations, and IOCs including file hashes and a C2 URL.

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