![]() We can leverage the environment variables that setup custom Application Domains,.Let me describe two and provide PoC scripts and binaries to demonstrate. We simply place an assembly named tasks.dll into eitherĬ:\Windows\System32\Tasks or C:\Windows\SysWow64\Tasks. If we are trying to load a custom assembly into say, mshta.exe, we can take advantage of the fact that C:\Windows\System32\Tasks is a globally writable path. If the referenced assembly is not found in the application base and no culture information is provided, the runtime searches any subdirectories with the assembly name. ![]() The runtime always begins probing in the application's base, which can be either a URL or the application's root directory on a computer. This is a design pattern fully supported and documented in the CLR.Īs described in How the Runtime Locates Assemblies, we can see that probing of the application base can be influenced. NET Application in System32.įor example, cscript, wscript, regsvr32, mshta, eventvwr Executing Arbitrary Assemblies In The Context Of Windows Script Hostsīy locating an arbitrary assembly in C:\Windows\System32\Tasks or C:\Windows\SysWOW64\Tasks we can load or influence any script hosts or ANY. ![]()
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