title: Suspicious Script Execution From Temp Folder
author: Florian Roth, Max Altgelt
date: 2021/07/14
description: Detects a suspicious script executions from temporary folder
detection:
    SELECTION_1:
        EventID: 1
    SELECTION_10:
        CommandLine: '*%TEMP%*'
    SELECTION_11:
        CommandLine: '*%TMP%*'
    SELECTION_12:
        CommandLine: '*%LocalAppData%\Temp*'
    SELECTION_13:
        CommandLine: '* >*'
    SELECTION_14:
        CommandLine: '*Out-File*'
    SELECTION_15:
        CommandLine: '*ConvertTo-Json*'
    SELECTION_16:
        CommandLine: '*-WindowStyle hidden -Verb runAs*'
    SELECTION_2:
        Image: '*\powershell.exe'
    SELECTION_3:
        Image: '*\mshta.exe'
    SELECTION_4:
        Image: '*\wscript.exe'
    SELECTION_5:
        Image: '*\cscript.exe'
    SELECTION_6:
        CommandLine: '*\Windows\Temp*'
    SELECTION_7:
        CommandLine: '*\Temporary Internet*'
    SELECTION_8:
        CommandLine: '*\AppData\Local\Temp*'
    SELECTION_9:
        CommandLine: '*\AppData\Roaming\Temp*'
    condition: (SELECTION_1 and ((SELECTION_2 or SELECTION_3 or SELECTION_4 or SELECTION_5)
        and (SELECTION_6 or SELECTION_7 or SELECTION_8 or SELECTION_9 or SELECTION_10
        or SELECTION_11 or SELECTION_12)) and  not ((SELECTION_13 or SELECTION_14
        or SELECTION_15 or SELECTION_16)))
falsepositives:
- Administrative scripts
id: a6a39bdb-935c-4f0a-ab77-35f4bbf44d33
level: high
logsource:
    category: process_creation
    product: windows
modified: 2021/11/11
references:
- https://www.microsoft.com/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploit/
status: experimental
tags:
- attack.execution
yml_filename: win_susp_script_exec_from_temp.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation