Adversaries may abuse Regsvcs and Regasm to proxy execution of code through a trusted Windows utility. Regsvcs and Regasm are Windows command-line utilities that are used to register .NET Component Object Model (COM) assemblies. Both are binaries that may be digitally signed by Microsoft.[1],[2]
Both utilities may be used to bypass application control through use of attributes within the binary to specify code that should be run before registration or unregistration: [ComRegisterFunction] or [ComUnregisterFunction] respectively. The code with the registration and unregistration attributes will be executed even if the process is run under insufficient privileges and fails to execute.[3],[4]
References
- Microsoft. (n.d.). Regsvcs.exe (.NET Services Installation Tool). Retrieved July 1, 2016.
- Microsoft. (n.d.). Regasm.exe (Assembly Registration Tool). Retrieved July 1, 2016.
- LOLBAS. (n.d.). Regsvcs.exe. Retrieved July 31, 2019.
- LOLBAS. (n.d.). Regasm.exe. Retrieved July 31, 2019.
Länkade ärenden
- MITREATTACK -
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