Detection rules › Sigma
Uncommon Child Process Of AddinUtil.EXE
Detects uncommon child processes of the Add-In deployment cache updating utility (AddInutil.exe) which could be a sign of potential abuse of the binary to proxy execution via a custom Addins.Store payload.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth | T1218 System Binary Proxy Execution |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
title: Uncommon Child Process Of AddinUtil.EXE
id: b5746143-59d6-4603-8d06-acbd60e166ee
status: test
description: |
Detects uncommon child processes of the Add-In deployment cache updating utility (AddInutil.exe) which could be a sign of potential abuse of the binary to proxy execution via a custom Addins.Store payload.
references:
- https://www.blue-prints.blog/content/blog/posts/lolbin/addinutil-lolbas.html
author: Michael McKinley (@McKinleyMike), Tony Latteri (@TheLatteri)
date: 2023-09-18
tags:
- attack.stealth
- attack.t1218
logsource:
category: process_creation
product: windows
detection:
selection:
ParentImage|endswith: '\addinutil.exe'
filter_main_werfault:
Image|endswith:
- ':\Windows\System32\conhost.exe'
- ':\Windows\System32\werfault.exe'
- ':\Windows\SysWOW64\werfault.exe'
condition: selection and not 1 of filter_main_*
falsepositives:
- Unknown
level: medium
Stages and Predicates
Stage 0: condition
selection and not 1 of filter_main_*Stage 1: selection
selection:
ParentImage|endswith: '\addinutil.exe'
Stage 2: not filter_main_werfault
filter_main_werfault:
Image|endswith:
- ':\Windows\System32\conhost.exe'
- ':\Windows\System32\werfault.exe'
- ':\Windows\SysWOW64\werfault.exe'
Exclusions
Top-level NOT(...) conjuncts: predicates this rule actively suppresses.
| Field | Kind | Excluded values |
|---|---|---|
Image | ends_with | :\Windows\SysWOW64\werfault.exe |
Image | ends_with | :\Windows\System32\conhost.exe |
Image | ends_with | :\Windows\System32\werfault.exe |
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
ParentImage | ends_with |
|