Detection rules › Sigma
Suspicious Invocation of Shell via Rsync
Detects the execution of a shell as sub process of "rsync" without the expected command line flag "-e" being used, which could be an indication of exploitation as described in CVE-2024-12084. This behavior is commonly associated with attempts to execute arbitrary commands or escalate privileges, potentially leading to unauthorized access or further exploitation.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | T1059 Command and Scripting Interpreter, T1203 Exploitation for Client Execution |
Event coverage
| Provider | Event |
|---|---|
| Sysmon-for-Linux | Event ID 1 |
Rule body yaml
title: Suspicious Invocation of Shell via Rsync
id: 297241f3-8108-4b3a-8c15-2dda9f844594
status: experimental
description: |
Detects the execution of a shell as sub process of "rsync" without the expected command line flag "-e" being used, which could be an indication of exploitation as described in CVE-2024-12084. This behavior is commonly associated with attempts to execute arbitrary commands or escalate privileges, potentially leading to unauthorized access or further exploitation.
references:
- https://sysdig.com/blog/detecting-and-mitigating-cve-2024-12084-rsync-remote-code-execution/
- https://gist.github.com/Neo23x0/a20436375a1e26524931dd8ea1a3af10
author: Florian Roth
date: 2025-01-18
tags:
- attack.execution
- attack.t1059
- attack.t1203
logsource:
category: process_creation
product: linux
detection:
selection:
ParentImage|endswith:
- '/rsync'
- '/rsyncd'
Image|endswith:
- '/ash'
- '/bash'
- '/csh'
- '/dash'
- '/ksh'
- '/sh'
- '/tcsh'
- '/zsh'
filter_main_expected:
CommandLine|contains: ' -e '
condition: selection and not 1 of filter_main_*
falsepositives:
- Unknown
level: high
Stages and Predicates
Stage 0: condition
selection and not 1 of filter_main_*Stage 1: selection
selection:
ParentImage|endswith:
- '/rsync'
- '/rsyncd'
Image|endswith:
- '/ash'
- '/bash'
- '/csh'
- '/dash'
- '/ksh'
- '/sh'
- '/tcsh'
- '/zsh'
Stage 2: not filter_main_expected
filter_main_expected:
CommandLine|contains: ' -e '
Exclusions
Top-level NOT(...) conjuncts: predicates this rule actively suppresses.
| Field | Kind | Excluded values |
|---|---|---|
CommandLine | match | -e |
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
Image | ends_with |
|
ParentImage | ends_with |
|