AddinUtil.exe

AddinUtil is executed from the directory where the 'Addins.Store' payload exists, AddinUtil will execute the 'Addins.Store' payload.

Use Proxy execution of malicious serialized payload

C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddinUtil.exe -AddinRoot:.

Context

user

Native

Execute

MITRE

T1218

Detection

Sigma: github.com/SigmaHQ/sigma/blob/master/rules/windows/process_creation/proc_creation_win_addinutil_suspicious_cmdline.yml

Sigma: github.com/SigmaHQ/sigma/blob/master/rules/windows/process_creation/proc_creation_win_addinutil_uncommon_child_process.yml

Sigma: github.com/SigmaHQ/sigma/blob/master/rules/windows/process_creation/proc_creation_win_addinutil_uncommon_cmdline.yml

Sigma: github.com/SigmaHQ/sigma/blob/master/rules/windows/process_creation/proc_creation_win_addinutil_uncommon_dir_exec.yml

Refs

www.blue-prints.blog/content/blog/posts/lolbin/addinutil-lolbas.html

lolbas-project.github.io/lolbas/Binaries/AddinUtil/