Adversaries may bypass process and/or signature-based defenses by proxying execution of malicious content with signed, or otherwise trusted, binaries. Binaries used in this technique are often Microsoft-signed files, indicating that they have been either downloaded from Microsoft or are already native in the operating system.(Citation: LOLBAS Project) Binaries signed with trusted digital certificates can typically execute on Windows systems protected by digital signature validation. Several Microsoft signed binaries that are default on Windows installations can be used to proxy execution of other files or commands.

Similarly, on Linux systems adversaries may abuse trusted binaries such as <code>split</code> to proxy execution of malicious commands.(Citation: split man page)(Citation: GTFO split)
System Binary Proxy Execution
source_name: mitre-attack  url: https://attack.mitre.org/techniques/T1218  external_id: T1218     source_name: GTFO split  description: GTFOBins. (2020, November 13). split. Retrieved April 18, 2022.  url: https://gtfobins.github.io/gtfobins/split/     source_name: LOLBAS Project  description: Oddvar Moe et al. (2022, February).  Living Off The Land Binaries, Scripts and Libraries. Retrieved March 7, 2022.  url: https://github.com/LOLBAS-Project/LOLBAS#criteria     source_name: split man page  description: Torbjorn Granlund, Richard M. Stallman. (2020, March null). split(1) — Linux manual page. Retrieved March 25, 2022.  url: https://man7.org/linux/man-pages/man1/split.1.html     