SigmaHQ/rules/windows/malware/win_mal_wannacry.yml

action: global
title: WannaCry Ransomware 
description: Detects WannaCry Ransomware Activity
status: experimental
reference: 
    - https://www.hybrid-analysis.com/sample/ed01ebfbc9eb5bbea545af4d01bf5f1071661840480439c6e5babe8e080e41aa
author: Florian Roth
detection:
    selection1:
        CommandLine:
            - '*vssadmin delete shadows*'
            - '*icacls * /grant Everyone:F /T /C /Q*'
            - '*bcdedit /set {default} recoveryenabled no*'
            - '*wbadmin delete catalog -quiet*'
    condition: selection1 or selection2
falsepositives: 
    - Unknown
level: critical
---
# Windows Audit Log
logsource:
    product: windows
    service: security
    description: 'Requirements: Audit Policy : Detailed Tracking > Audit Process creation, Group Policy : Administrative Templates\System\Audit Process Creation'
detection:
    selection1:
        # Requires group policy 'Audit Process Creation' > Include command line in process creation events
        EventID: 4688
    selection2:
        # Does not require group policy 'Audit Process Creation' > Include command line in process creation events
        EventID: 4688
        NewProcessName:
            - '*\tasksche.exe'
            - '*\mssecsvc.exe'
            - '*\taskdl.exe'
            - '*\WanaDecryptor*'
            - '*\taskhsvc.exe'
            - '*\taskse.exe'
            - '*\111.exe'
            - '*\lhdfrgui.exe'
            - '*\diskpart.exe'  # Rare, but can be false positive
            - '*\linuxnew.exe'
            - '*\wannacry.exe'
---
# Sysmon
logsource:
    product: windows
    service: sysmon
detection:
    selection1:
        # Requires group policy 'Audit Process Creation' > Include command line in process creation events
        EventID: 1
    selection2:
        # Does not require group policy 'Audit Process Creation' > Include command line in process creation events
        EventID: 1
        Image:
            - '*\tasksche.exe'
            - '*\mssecsvc.exe'
            - '*\taskdl.exe'
            - '*\WanaDecryptor*'
            - '*\taskhsvc.exe'
            - '*\taskse.exe'
            - '*\111.exe'
            - '*\lhdfrgui.exe'
            - '*\diskpart.exe'  # Rare, but can be false positive
            - '*\linuxnew.exe'
            - '*\wannacry.exe'