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Convert indexed Sigma rules into analyst-ready detections.
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Indexed Rules
3,707
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17
Live from sigconverter.io
CLI Versions
10
Newest: 2.0.2
Translation Workspace
Shape the rule before it leaves Phoenix
Tune Translation
Active Rule
Suspicious File Write to SharePoint Layouts Directory
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Suspicious File Write to SharePoint Layouts Directory
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: Suspicious File Write to SharePoint Layouts Directory
id: 1f0489be-b496-4ddf-b3a9-5900f2044e9c
status: experimental
description: |
Detects suspicious file writes to SharePoint layouts directory which could indicate webshell activity or post-exploitation.
This behavior has been observed in the exploitation of SharePoint vulnerabilities such as CVE-2025-49704, CVE-2025-49706 or CVE-2025-53770.
references:
- https://unit42.paloaltonetworks.com/microsoft-sharepoint-cve-2025-49704-cve-2025-49706-cve-2025-53770/
- https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-07-24
tags:
- attack.initial-access
- attack.t1190
- attack.persistence
- attack.t1505.003
logsource:
product: windows
category: file_event
detection:
selection:
Image|endswith:
- '\cmd.exe'
- '\powershell_ise.exe'
- '\powershell.exe'
- '\pwsh.exe'
- '\w3wp.exe'
TargetFilename|startswith:
- 'C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\'
- 'C:\Program Files (x86)\Common Files\Microsoft Shared\Web Server Extensions\'
TargetFilename|contains:
- '\15\TEMPLATE\LAYOUTS\'
- '\16\TEMPLATE\LAYOUTS\'
TargetFilename|endswith:
- '.asax'
- '.ascx'
- '.ashx'
- '.asmx'
- '.asp'
- '.aspx'
- '.bat'
- '.cmd'
- '.cer'
- '.config'
- '.hta'
- '.js'
- '.jsp'
- '.jspx'
- '.php'
- '.ps1'
- '.vbs'
condition: selection
falsepositives:
- Unknown
level: high
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/windows/file/file_event/file_event_win_susp_filewrite_in_sharepoint_layouts_dir.yml