Phoenix Studio
Convert indexed Sigma rules into analyst-ready detections.
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Indexed Rules
3,707
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Backends
17
Live from sigconverter.io
CLI Versions
10
Newest: 2.0.2
Translation Workspace
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Active Rule
Process Creation Using Sysnative Folder
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Process Creation Using Sysnative Folder
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
title: Process Creation Using Sysnative Folder
id: 3c1b5fb0-c72f-45ba-abd1-4d4c353144ab
status: test
description: Detects process creation events that use the Sysnative folder (common for CobaltStrike spawns)
references:
- https://thedfirreport.com/2021/08/29/cobalt-strike-a-defenders-guide/
author: Max Altgelt (Nextron Systems)
date: 2022-08-23
modified: 2025-10-08
tags:
- attack.defense-evasion
- attack.privilege-escalation
- attack.t1055
logsource:
category: process_creation
product: windows
detection:
selection:
- CommandLine|contains: ':\Windows\Sysnative\'
- Image|contains: ':\Windows\Sysnative\'
filter_main_ngen:
Image|contains:
- 'C:\Windows\Microsoft.NET\Framework64\v'
- 'C:\Windows\Microsoft.NET\Framework\v'
- 'C:\Windows\Microsoft.NET\FrameworkArm\v'
- 'C:\Windows\Microsoft.NET\FrameworkArm64\v'
Image|endswith: '\ngen.exe'
CommandLine|contains: 'install'
filter_optional_xampp:
CommandLine|contains|all:
- '"C:\Windows\sysnative\cmd.exe"'
- '\xampp\'
- '\catalina_start.bat'
condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
falsepositives:
- Unknown
level: medium
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/windows/process_creation/proc_creation_win_susp_sysnative.yml