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Convert indexed Sigma rules into analyst-ready detections.

This studio is built around Phoenix's own rule corpus, not a blank editor. Search by title or rule id, choose a live sigma-cli backend, then reveal pipelines only when you actually need them.

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Indexed Rules

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CLI Versions

Newest: 2.0.2

Translation Workspace

Shape the rule before it leaves Phoenix

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Active Rule

Suspicious Appended Extension

sigma-cli version

Backend

Format

Target Profile

Splunk

Splunk SPL & tstats data model queries

Format Mode

Default

Plain SPL queries

Conversion Output

Suspicious Appended Extension

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 Appended Extension
id: e3f673b3-65d1-4d80-9146-466f8b63fa99
status: test
description: Detects file renames where the target filename uses an uncommon double extension. Could indicate potential ransomware activity renaming files and adding a custom extension to the encrypted files, such as ".jpg.crypted", ".docx.locky", etc.
references:
    - https://app.any.run/tasks/d66ead5a-faf4-4437-93aa-65785afaf9e5/
    - https://blog.cyble.com/2022/08/10/onyx-ransomware-renames-its-leak-site-to-vsop/
author: frack113
date: 2022-07-16
modified: 2023-11-11
tags:
    - attack.impact
    - attack.t1486
logsource:
    product: windows
    category: file_rename
    definition: 'Requirements: Microsoft-Windows-Kernel-File Provider with at least the KERNEL_FILE_KEYWORD_RENAME_SETLINK_PATH keyword'
detection:
    selection:
        SourceFilename|endswith:
            - '.doc'
            - '.docx'
            - '.jpeg'
            - '.jpg'
            - '.lnk'
            - '.pdf'
            - '.png'
            - '.pst'
            - '.rtf'
            - '.xls'
            - '.xlsx'
        TargetFilename|contains:
            - '.doc.'
            - '.docx.'
            - '.jpeg.'
            - '.jpg.'
            - '.lnk.'
            - '.pdf.'
            - '.png.'
            - '.pst.'
            - '.rtf.'
            - '.xls.'
            - '.xlsx.'
    filter_main_generic:
        TargetFilename|endswith:
            # Note: Please add more used extensions by backup or recovery software
            - '.backup'
            - '.bak'
            - '.old'
            - '.orig'
            - '.temp'
            - '.tmp'
    filter_optional_anaconda:
        TargetFilename|contains: ':\ProgramData\Anaconda3\'
        TargetFilename|endswith: '.c~'
    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
falsepositives:
    - Backup software
level: medium

CLI command

Copy the exact command to reproduce this translation locally.

sigma convert --without-pipeline -t splunk -f default rules/windows/file/file_rename/file_rename_win_ransomware.yml