title: Suspicious XOR Encoded PowerShell Command Line
author: Teymur Kheirkhabarov, Harish Segar (rule)
date: 2020/06/29
description: Detects suspicious powershell process which includes bxor command, alternative
    obfuscation method to b64 encoded commands.
detection:
    SELECTION_1:
        HostName: ConsoleHost
    SELECTION_2:
        HostApplication: '*bxor*'
    SELECTION_3:
        HostApplication: '*join*'
    SELECTION_4:
        HostApplication: '*char*'
    condition: (SELECTION_1 and (SELECTION_2 or SELECTION_3 or SELECTION_4))
falsepositives:
- unknown
id: 812837bb-b17f-45e9-8bd0-0ec35d2e3bd6
level: medium
logsource:
    category: ps_classic_start
    definition: fields have to be extract from event
    product: windows
modified: 2021/10/16
status: experimental
tags:
- attack.execution
- attack.t1059.001
- attack.t1086
yml_filename: powershell_xor_commandline.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/powershell/powershell_classic