title: ZxShell Malware
id: f0b70adb-0075-43b0-9745-e82a1c608fcc
description: Detects a ZxShell start by the called and well-known function name
author: Florian Roth
date: 2017/07/20
modified: 2020/08/26
references:
    - https://www.hybrid-analysis.com/sample/5d2a4cde9fa7c2fdbf39b2e2ffd23378d0c50701a3095d1e91e3cf922d7b0b16?environmentId=100
tags:
    - attack.execution
    - attack.t1059.003
    - attack.t1059  # an old one
    - attack.defense_evasion
    - attack.t1218.011
    - attack.t1085  # an old one
    - attack.s0412
    - attack.g0001
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains:
            - 'rundll32.exe *,zxFunction*'
            - 'rundll32.exe *,RemoteDiskXXXXX'
    condition: selection
fields:
    - CommandLine
    - ParentCommandLine
falsepositives:
    - Unlikely
level: critical
