MSBuild Abuse Helps Attackers Launch Stealthy Fileless Windows Intrusions
ID: 6e9098d8-041a-5793-8e18-c27843f49cc8
STIX ID: report--6e9098d8-041a-5793-8e18-c27843f49cc8
Feed Name: Cyber Press
Threat Score
The report details how attackers are abusing Microsoft-signed MSBuild.exe to conduct fileless intrusions by embedding and executing inline C# in project files, demonstrating a PoC reverse shell and a February 2026 phishing campaign that used MSBuild plus DLL sideloading to deliver PlugX through signed binaries and evasive packaging.
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