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
Linux Base64 Encoded Shebang In CLI
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Linux Base64 Encoded Shebang In CLI
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: Linux Base64 Encoded Shebang In CLI
id: fe2f9663-41cb-47e2-b954-8a228f3b9dff
status: test
description: Detects the presence of a base64 version of the shebang in the commandline, which could indicate a malicious payload about to be decoded
references:
- https://www.trendmicro.com/pl_pl/research/20/i/the-evolution-of-malicious-shell-scripts.html
- https://github.com/carlospolop/PEASS-ng/tree/master/linPEAS
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-09-15
tags:
- attack.defense-evasion
- attack.t1140
logsource:
product: linux
category: process_creation
detection:
selection:
CommandLine|contains:
- "IyEvYmluL2Jhc2" # Note: #!/bin/bash"
- "IyEvYmluL2Rhc2" # Note: #!/bin/dash"
- "IyEvYmluL3pza" # Note: #!/bin/zsh"
- "IyEvYmluL2Zpc2" # Note: #!/bin/fish
- "IyEvYmluL3No" # Note: # !/bin/sh"
condition: selection
falsepositives:
- Legitimate administration activities
level: medium
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/linux/process_creation/proc_creation_lnx_base64_shebang_cli.yml