Detection rules › Sigma
User added to a group via commandline
Detects scenarios where an attacker attempts to escalate privilege by adding a user to a group via commandline.
Known false positives
- Pentest
- Administrator activity
- Splunk UF agent installation
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 1: Process creation |
| Security-Auditing | Event ID 4688: A new process has been created. |
Rule body
title: User added to a group via commandline
description: Detects scenarios where an attacker attempts to escalate privilege by adding a user to a group via commandline.
references:
- https://blogs.jpcert.or.jp/en/2016/01/windows-commands-abused-by-attackers.html
- https://attack.mitre.org/software/S0039/
tags:
- attack.persistence
- attack.t1098 # account manipulation
author: mdecrevoisier
logsource:
product: windows
category: process_creation
detection:
selection: # Full command example: 'net localgroup "Remote Desktop Users" /Add DefaultAccount'
NewProcessName|endswith:
- \net1.exe
- \net.exe
CommandLine|contains:
- group
- localgroup
CommandLine|contains: add
condition: selection
falsepositives:
- Pentest
- Administrator activity
- Splunk UF agent installation
level: high
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
NewProcessName|endswith:
- \net1.exe
- \net.exe
CommandLine|contains:
- group
- localgroup
CommandLine|contains: add
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
CommandLine | match |
| field:"CommandLine" kind:match value:"add" |
NewProcessName | ends_with |
| field:"Image" kind:ends_with |