Phoenix Studio
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.
Indexed Rules
3,707
Ready to search
Backends
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
CVE-2021-26858 Exchange Exploitation
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
CVE-2021-26858 Exchange Exploitation
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: CVE-2021-26858 Exchange Exploitation
id: b06335b3-55ac-4b41-937e-16b7f5d57dfd
status: test
description: |
Detects possible successful exploitation for vulnerability described in CVE-2021-26858 by looking for
creation of non-standard files on disk by Exchange Server’s Unified Messaging service
which could indicate dropping web shells or other malicious content
references:
- https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/
author: Bhabesh Raj
date: 2021-03-03
modified: 2022-10-09
tags:
- attack.t1203
- attack.execution
- cve.2021-26858
- detection.emerging-threats
logsource:
category: file_event
product: windows
detection:
selection:
Image|endswith: 'UMWorkerProcess.exe'
filter:
TargetFilename|endswith:
- 'CacheCleanup.bin'
- '.txt'
- '.LOG'
- '.cfg'
- 'cleanup.bin'
condition: selection and not filter
falsepositives:
- Unknown
level: high
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules-emerging-threats/2021/Exploits/CVE-2021-26858/file_event_win_cve_2021_26858_msexchange.yml