SigmaHQ/rules/windows/process_creation/win_powershell_b64_shellcode.yml

title: PowerShell Base64 Encoded Shellcode
description: Detects Base64 encoded Shellcode
status: experimental
references:
    - https://twitter.com/cyb3rops/status/1063072865992523776
author: Florian Roth
date: 2018/11/17
tags:
    - attack.defense_evasion
    - attack.t1036
logsource:
    category: process_creation
    product: windows
detection:
    selection1:
        CommandLine: '*AAAAYInlM*'
    selection2:
        CommandLine:
            - '*OiCAAAAYInlM*'
            - '*OiJAAAAYInlM*'
    condition: selection1 and selection2
falsepositives:
    - Unknown
level: critical
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`title: PowerShell Base64 Encoded Shellcode`
			`description: Detects Base64 encoded Shellcode`
			`status: experimental`
			`references:`
Increased indentation to 4 * Converted (to generic sigma) rules * Converter outputs by default with indentation 4 2019-03-01 23:14:20 +00:00			`- https://twitter.com/cyb3rops/status/1063072865992523776`
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`author: Florian Roth`
			`date: 2018/11/17`
			`tags:`
Increased indentation to 4 * Converted (to generic sigma) rules * Converter outputs by default with indentation 4 2019-03-01 23:14:20 +00:00			`- attack.defense_evasion`
			`- attack.t1036`
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`logsource:`
Increased indentation to 4 * Converted (to generic sigma) rules * Converter outputs by default with indentation 4 2019-03-01 23:14:20 +00:00			`category: process_creation`
			`product: windows`
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`detection:`
Increased indentation to 4 * Converted (to generic sigma) rules * Converter outputs by default with indentation 4 2019-03-01 23:14:20 +00:00			`selection1:`
			`CommandLine: 'AAAAYInlM'`
			`selection2:`
			`CommandLine:`
			`- 'OiCAAAAYInlM'`
			`- 'OiJAAAAYInlM'`
			`condition: selection1 and selection2`
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`falsepositives:`
Increased indentation to 4 * Converted (to generic sigma) rules * Converter outputs by default with indentation 4 2019-03-01 23:14:20 +00:00			`- Unknown`
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`level: critical`