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proc_creation_win_powershell_base64_wmi_classes.yml
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proc_creation_win_powershell_base64_wmi_classes.yml
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title: PowerShell Base64 Encoded WMI Classes
id: 1816994b-42e1-4fb1-afd2-134d88184f71
related:
- id: 47688f1b-9f51-4656-b013-3cc49a166a36
type: obsoletes
status: test
description: Detects calls to base64 encoded WMI class such as "Win32_Shadowcopy", "Win32_ScheduledJob", etc.
references:
- https://github.com/Neo23x0/Raccine/blob/20a569fa21625086433dcce8bb2765d0ea08dcb6/yara/mal_revil.yar
author: Christian Burkard (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
date: 2023/01/30
tags:
- attack.execution
- attack.t1059.001
- attack.defense_evasion
- attack.t1027
logsource:
category: process_creation
product: windows
detection:
selection_img:
- Image|endswith:
- '\powershell.exe'
- '\pwsh.exe'
- OriginalFileName:
- 'PowerShell.EXE'
- 'pwsh.dll'
selection_cli_shadowcopy:
# Win32_Shadowcopy
CommandLine|contains:
- 'VwBpAG4AMwAyAF8AUwBoAGEAZABvAHcAYwBvAHAAeQ'
- 'cAaQBuADMAMgBfAFMAaABhAGQAbwB3AGMAbwBwAHkA'
- 'XAGkAbgAzADIAXwBTAGgAYQBkAG8AdwBjAG8AcAB5A'
- 'V2luMzJfU2hhZG93Y29we'
- 'dpbjMyX1NoYWRvd2NvcH'
- 'XaW4zMl9TaGFkb3djb3B5'
selection_cli_scheduledJob:
# Win32_ScheduledJob
CommandLine|contains:
- 'VwBpAG4AMwAyAF8AUwBjAGgAZQBkAHUAbABlAGQASgBvAGIA'
- 'cAaQBuADMAMgBfAFMAYwBoAGUAZAB1AGwAZQBkAEoAbwBiA'
- 'XAGkAbgAzADIAXwBTAGMAaABlAGQAdQBsAGUAZABKAG8AYg'
- 'V2luMzJfU2NoZWR1bGVkSm9i'
- 'dpbjMyX1NjaGVkdWxlZEpvY'
- 'XaW4zMl9TY2hlZHVsZWRKb2'
selection_cli_process:
# Win32_Process
CommandLine|contains:
- 'VwBpAG4AMwAyAF8AUAByAG8AYwBlAHMAcw'
- 'cAaQBuADMAMgBfAFAAcgBvAGMAZQBzAHMA'
- 'XAGkAbgAzADIAXwBQAHIAbwBjAGUAcwBzA'
- 'V2luMzJfUHJvY2Vzc'
- 'dpbjMyX1Byb2Nlc3'
- 'XaW4zMl9Qcm9jZXNz'
selection_cli_useraccount:
# Win32_UserAccount
CommandLine|contains:
- 'VwBpAG4AMwAyAF8AVQBzAGUAcgBBAGMAYwBvAHUAbgB0A'
- 'cAaQBuADMAMgBfAFUAcwBlAHIAQQBjAGMAbwB1AG4AdA'
- 'XAGkAbgAzADIAXwBVAHMAZQByAEEAYwBjAG8AdQBuAHQA'
- 'V2luMzJfVXNlckFjY291bn'
- 'dpbjMyX1VzZXJBY2NvdW50'
- 'XaW4zMl9Vc2VyQWNjb3Vud'
selection_cli_loggedonuser:
# Win32_LoggedOnUser
CommandLine|contains:
- 'VwBpAG4AMwAyAF8ATABvAGcAZwBlAGQATwBuAFUAcwBlAHIA'
- 'cAaQBuADMAMgBfAEwAbwBnAGcAZQBkAE8AbgBVAHMAZQByA'
- 'XAGkAbgAzADIAXwBMAG8AZwBnAGUAZABPAG4AVQBzAGUAcg'
- 'V2luMzJfTG9nZ2VkT25Vc2Vy'
- 'dpbjMyX0xvZ2dlZE9uVXNlc'
- 'XaW4zMl9Mb2dnZWRPblVzZX'
condition: selection_img and 1 of selection_cli_*
falsepositives:
- Unknown
level: high