title: Suspicious Execution of Powershell with Base64 
id: fb843269-508c-4b76-8b8d-88679db22ce7
status: experimental
description: Commandline to lauch powershell with a base64 payload 
author: frack113
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1059.001/T1059.001.md#atomic-test-20---powershell-invoke-known-malicious-cmdlets
date: 2022/01/02
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: \powershell.exe
        CommandLine|contains|all:
            - '-e '
            - '==' # not all base64 have the ==
    condition: selection
falsepositives:
    - Unknown
level: medium
tags:
    - attack.execution
    - attack.t1059.001