blue-team-tools/rules/windows/process_creation/proc_creation_win_malware_ryuk.yml

title: Potential Ryuk Ransomware Activity
id: c37510b8-2107-4b78-aa32-72f251e7a844
related:
    - id: 58bf96d9-ff5f-44bd-8dcc-1c4f79bf3a27
      type: similar
    - id: 0acaad27-9f02-4136-a243-c357202edd74
      type: obsoletes
status: stable
description: Detects Ryuk ransomware activity
references:
    - https://app.any.run/tasks/d860402c-3ff4-4c1f-b367-0237da714ed1/
    - https://research.checkpoint.com/ryuk-ransomware-targeted-campaign-break/
author: Florian Roth (Nextron Systems), Vasiliy Burov, Nasreddine Bencherchali (Nextron Systems)
date: 2019/12/16
modified: 2023/02/03
tags:
    - attack.persistence
    - attack.t1547.001
logsource:
    category: process_creation
    product: windows
detection:
    selection_reg:
        CommandLine|contains|all:
            - 'Microsoft\Windows\CurrentVersion\Run'
            - 'C:\users\Public\'
    selection_del:
        CommandLine|contains|all:
            - 'del /s /f /q c:\'
            - '\*.bac'
            - '\*.bak'
            - '\*.bkf'
    selection_net:
        Image|endswith:
            - '\net.exe'
            - '\net1.exe'
        CommandLine|contains|all:
            - ' stop '
            - ' /y'
        CommandLine|contains:
            - 'samss'
            - 'audioendpointbuilder'
            - 'unistoresvc_'
            - 'AcrSch2Svc'
    condition: 1 of selection_*
fields:
    - CommandLine
    - ParentCommandLine
falsepositives:
    - Unlikely
level: high