Threat intelligence / Technique

Regsvcs/Regasm

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](https://attack.mitre.org/techniques/T1559/001) (COM) assemblies. Both are binaries that may be digitally signed by Microsoft. (Citation: MSDN Regsvcs) (Citation: MSDN Regasm) 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. (Citation: LOLBAS Regsvcs)(Citation: LOLBAS Regasm)

Technique

TypeTechnique

External ID—

First seen2026-08-14

Last seen2026-08-14

Confidence

—

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](https://attack.mitre.org/techniques/T1559/001) (COM) assemblies. Both are binaries that may be digitally signed by Microsoft. (Citation: MSDN Regsvcs) (Citation: MSDN Regasm) 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. (Citation: LOLBAS Regsvcs)(Citation: LOLBAS Regasm)

5 recorded

Relationships

mitigates

from Disable or Remove Feature or Program

Mitigation

mitigates

from Execution Prevention

Mitigation

revoked-by

from Regsvcs/Regasm

Technique

subtechnique-of

to System Binary Proxy Execution

Technique

uses

from Agent Tesla

Malware

5 external

References

mitre-attack

T1218.009

LOLBAS Regasm

https://lolbas-project.github.io/lolbas/Binaries/Regasm/

LOLBAS Regsvcs

https://lolbas-project.github.io/lolbas/Binaries/Regsvcs/

MSDN Regasm

https://msdn.microsoft.com/en-us/library/tzat5yw6.aspx

MSDN Regsvcs

https://msdn.microsoft.com/en-us/library/04za0hca.aspx