System Script Proxy Execution
Where this stands
One published detection covers this technique. Every one is unverified — no rule on Siemphony has been executed against real telemetry.
What the technique is
Adversaries may use trusted scripts, often signed with certificates, to proxy the execution of malicious files. Several Microsoft signed scripts that have been downloaded from Microsoft or are default on Windows installations can be used to proxy execution of other files. This behavior may be abused by adversaries to execute malicious files that could bypass application control and signature validation on systems.
Read it on attack.mitre.orgWhat MITRE says you would watch
- AN1288
Execution of Microsoft-signed scripts (e.g., pubprn.vbs, installutil.exe, wscript.exe, cscript.exe) used to proxy execution of untrusted or external binaries. Behavior is detected through command-line process lineage, child process spawning, and unsigned payload execution from signed parent.
Technique names and descriptions © MITRE ATT&CK®, CC BY 4.0. Not endorsed by MITRE.