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
    - https://unit42.paloaltonetworks.com/unit42-pulling-back-the-curtains-on-encodedcommand-powershell-attacks/
    - https://mikefrobbins.com/2017/06/15/simple-obfuscation-with-powershell-using-base64-encoding/
date: 2022/01/02
modified: 2022/02/10
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: \powershell.exe
        CommandLine|contains:
            - ' -e '
            - ' -en '
            - ' -enc '
            - ' -enco'
            - ' -ec '
    filter:
        CommandLine|contains:
            - ' -Encoding '
    condition: selection and not filter
falsepositives:
    - Unknown
level: medium
tags:
    - attack.execution
    - attack.t1059.001