action: global
title: Operation Wocao Activity
id: 74ad4314-482e-4c3e-b237-3f7ed3b9ca8d
author: Florian Roth, frack113
status: experimental
description: Detects activity mentioned in Operation Wocao report
references:
    - https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/
    - https://twitter.com/SBousseaden/status/1207671369963646976
tags:
    - attack.discovery 
    - attack.t1012
    - attack.defense_evasion
    - attack.t1036.004
    - attack.t1036  # an old one
    - attack.t1027
    - attack.execution
    - attack.t1053.005
    - attack.t1053  # an old one
    - attack.t1059.001
    - attack.t1086  # an old one
date: 2019/12/20
modified: 2021/07/07
falsepositives:
    - Administrators that use checkadmin.exe tool to enumerate local administrators
level: high
---
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4799
        TargetUserName|startswith: 'Administr'
        CallerProcessName|endswith: '\checkadmin.exe'
    condition: selection
---
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains: 
            - 'checkadmin.exe 127.0.0.1 -all'
            - 'netsh advfirewall firewall add rule name=powershell dir=in'
            - 'cmd /c powershell.exe -ep bypass -file c:\s.ps1'
            - '/tn win32times /f'
            - 'create win32times binPath='
            - '\c$\windows\system32\devmgr.dll'
            - ' -exec bypass -enc JgAg'
            - 'type *keepass\KeePass.config.xml'
            - 'iie.exe iie.txt'
            - 'reg query HKEY_CURRENT_USER\Software\\*\PuTTY\Sessions\'
    condition: selection