Find sigma rule 
Attack: Signed Binary Proxy Execution
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 split to proxy execution of malicious commands.(Citation: split man page)(Citation: GTFO split)
MITRE
Tactic
- defense-evasion
technique
- T1218
Test : LOLBAS CustomShellHost to Spawn Process
OS
- windows
Description:
This test simulates an adversary copying customshellhost.exe and calc.exe from C:\windows\system32\ to C:\temp\, renaming calc.exe to explorer.exe.
Upon execution, customshellhost.exe will spawn calc.exe.
Note this will only work on Windows 10 or 11.
LOLBAS
BishopFox
Executor
powershell
Sigma Rule
-
proc_creation_win_susp_copy_system_dir_lolbin.yml (id: f5d19838-41b5-476c-98d8-ba8af4929ee2)
-
proc_creation_win_susp_copy_system_dir.yml (id: fff9d2b7-e11c-4a69-93d3-40ef66189767)
-
proc_creation_win_susp_system_exe_anomaly.yml (id: e4a6b256-3e47-40fc-89d2-7a477edd6915)