Script Interpreter Execution From Suspicious Folder

title: Script Interpreter Execution From Suspicious Folder
id: 1228c958-e64e-4e71-92ad-7d429f4138ba
status: test
description: Detects a suspicious script execution in temporary folders or folders accessible by environment variables
references:
    - https://www.virustotal.com/gui/file/91ba814a86ddedc7a9d546e26f912c541205b47a853d227756ab1334ade92c3f
    - https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/shuckworm-russia-ukraine-military
    - https://learn.microsoft.com/en-us/windows/win32/shell/csidl
author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
date: 2022-02-08
modified: 2023-06-16
tags:
    - attack.execution
    - attack.t1059
logsource:
    category: process_creation
    product: windows
detection:
    selection_proc_image:
        Image|endswith:
            - '\cscript.exe'
            - '\mshta.exe'
            - '\wscript.exe'
    selection_proc_flags:
        CommandLine|contains:
            - ' -ep bypass '
            - ' -ExecutionPolicy bypass '
            - ' -w hidden '
            - '/e:javascript '
            - '/e:Jscript '
            - '/e:vbscript '
    selection_proc_original:
        OriginalFileName:
            - 'cscript.exe'
            - 'mshta.exe'
            - 'wscript.exe'
    selection_folders_1:
        CommandLine|contains:
            - ':\Perflogs\'
            - ':\Users\Public\'
            - '\AppData\Local\Temp'
            - '\AppData\Roaming\Temp'
            - '\Temporary Internet'
            - '\Windows\Temp'
    selection_folders_2:
        - CommandLine|contains|all:
              - ':\Users\'
              - '\Favorites\'
        - CommandLine|contains|all:
              - ':\Users\'
              - '\Favourites\'
        - CommandLine|contains|all:
              - ':\Users\'
              - '\Contacts\'
    condition: 1 of selection_proc_* and 1 of selection_folders_*
falsepositives:
    - Unknown
level: high