Detection rules › Sigma
User Added to Local Administrators Group
Detects addition of users to the local administrator group via "Net" or "Add-LocalGroupMember".
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1098 Account Manipulation |
| Privilege Escalation | T1098 Account Manipulation |
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: User Added to Local Administrators Group
id: ad720b90-25ad-43ff-9b5e-5c841facc8e5
related:
- id: ffa28e60-bdb1-46e0-9f82-05f7a61cc06e # Remote Desktop groups
type: similar
- id: 10fb649c-3600-4d37-b1e6-56ea90bb7e09 # Privileged groups
type: similar
status: test
description: Detects addition of users to the local administrator group via "Net" or "Add-LocalGroupMember".
references:
- https://blog.talosintelligence.com/2022/08/recent-cyber-attack.html?m=1
author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-12
modified: 2023-03-02
tags:
- attack.privilege-escalation
- attack.persistence
- attack.t1098
logsource:
category: process_creation
product: windows
detection:
selection_main:
- CommandLine|contains|all:
# net.exe
- 'localgroup '
- ' /add'
- CommandLine|contains|all:
# powershell.exe
- 'Add-LocalGroupMember '
- ' -Group '
selection_group:
CommandLine|contains:
- ' administrators '
- ' administrateur' # Typo without an 'S' so we catch both
condition: all of selection_*
falsepositives:
- Administrative activity
level: medium
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_main
selection_main:
- CommandLine|contains|all:
- 'localgroup '
- ' /add'
- CommandLine|contains|all:
- 'Add-LocalGroupMember '
- ' -Group '
Stage 2: selection_group
selection_group:
CommandLine|contains:
- ' administrators '
- ' administrateur'
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 |
|---|---|---|
CommandLine | match |
|