sigmaDRL-1.1from SigmaHQ/sigma

Potential Arbitrary File Download Via Cmdl32.EXE

Detects execution of Cmdl32 with the "/vpn" and "/lan" flags. Attackers can abuse this utility in order to download arbitrary files via a configuration file. Inspect the location and the content of the file passed as an argument in order to determine if it is suspicious.

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ATT&CK techniques

T1218 T1202

Rule sourcerules/windows/process_creation/proc_creation_win_cmdl32_arbitrary_file_download.yml

title: Potential Arbitrary File Download Via Cmdl32.EXE
id: f37aba28-a9e6-4045-882c-d5004043b337
status: test
description: |
    Detects execution of Cmdl32 with the "/vpn" and "/lan" flags.
    Attackers can abuse this utility in order to download arbitrary files via a configuration file.
    Inspect the location and the content of the file passed as an argument in order to determine if it is suspicious.
references:
    - https://lolbas-project.github.io/lolbas/Binaries/Cmdl32/
    - https://twitter.com/SwiftOnSecurity/status/1455897435063074824
    - https://github.com/LOLBAS-Project/LOLBAS/pull/151
author: frack113
date: 2021-11-03
modified: 2024-04-22
tags:
    - attack.execution
    - attack.defense-evasion
    - attack.t1218
    - attack.t1202
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\cmdl32.exe'
        - OriginalFileName: CMDL32.EXE
    selection_cli:
        CommandLine|contains|all:
            - '/vpn'
            - '/lan'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium