Linux Base64 Encoded Pipe to Shell
Detects suspicious process command line that uses base64 encoded input for execution with a shell
Detection logic
selection_base64
CommandLine|contains: "base64 "selection_exec
- CommandLine|contains:
- "| bash "
- "| sh "
- "|bash "
- "|sh "
- CommandLine|endswith:
- " |sh"
- "| bash"
- "| sh"
- "|bash"Condition
all of selection_*Raw YAML
title: Linux Base64 Encoded Pipe to Shell
id: ba592c6d-6888-43c3-b8c6-689b8fe47337
status: test
description: Detects suspicious process command line that uses base64 encoded input for execution with a shell
references:
- https://github.com/arget13/DDexec
- https://www.mandiant.com/resources/blog/barracuda-esg-exploited-globally
author: pH-T (Nextron Systems)
date: 2022-07-26
modified: 2023-06-16
tags:
- attack.stealth
- attack.t1140
logsource:
product: linux
category: process_creation
detection:
selection_base64:
CommandLine|contains: 'base64 '
selection_exec:
- CommandLine|contains:
- '| bash '
- '| sh '
- '|bash '
- '|sh '
- CommandLine|endswith:
- ' |sh'
- '| bash'
- '| sh'
- '|bash'
condition: all of selection_*
falsepositives:
- Legitimate administration activities
level: mediumFalse positives
- Legitimate administration activities