Iranian APT - Blinder Tunnel: Masqueraded RuntimeBroker/vshost32 Host - AppDomainManager Hijack
Detects the trusted .NET host used in Blinder Tunnel to run an attacker-supplied AppDomainManager: a renamed signed Visual Studio hosting binary as RuntimeBroker.exe, or vshost32.exe for the Blackwood tunneling tool. The attacker’s <host>.exe .config names the malicious DLL, which loads before any host code. The genuine RuntimeBroker.exe only runs from System32, and the \Microsoft\RuntimeBrokers\ install folder does not exist on a clean Windows install. The path arm therefore still fires if the actor renames the host. A LaunchContext field separates first execution (MSBuild/devenv .csproj trigger or Inno Setup installer) from Explorer autostart.
Microsoft Sentinel (KQL)
