CVE-2024-50623 Exploitation Attempt - Cleo

SIGMA detection rule by Tanner Filip, Austin Worline, Chad Hudson, Matt Anderson · NOASSERTION

Detects exploitation attempt of Cleo's CVE-2024-50623 by looking for a "cmd.exe" process spawning from the Celo software suite with suspicious Powershell commandline.

title: CVE-2024-50623 Exploitation Attempt - Cleo
id: f007b877-02e3-45b7-8501-1b78c2864029
status: experimental
description: |
    Detects exploitation attempt of Cleo's CVE-2024-50623 by looking for a "cmd.exe" process spawning from the Celo software suite with suspicious Powershell commandline.
references:
    - https://www.huntress.com/blog/threat-advisory-oh-no-cleo-cleo-software-actively-being-exploited-in-the-wild
author: Tanner Filip, Austin Worline, Chad Hudson, Matt Anderson
date: 2024-12-09
tags:
    - attack.initial-access
    - attack.execution
    - attack.t1190
    - cve.2024-50623
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\javaw.exe'
        ParentCommandLine|contains:
            - 'Harmony'
            - 'lexicom'
            - 'VersaLex'
            - 'VLTrader'
        Image|endswith: '\cmd.exe'
        CommandLine|contains:
            - 'powershell'
            - ' -enc '
            - ' -EncodedCommand'
            - '.Download'
    condition: selection
falsepositives:
    - Unlikely
level: high

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

151cdd11-3f25-4419-b44e-e027a4115699

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

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