rules/windows/process_creation/win_powershell_frombase64string.yml

title: FromBase64String Command Line
id: e32d4572-9826-4738-b651-95fa63747e8a
status: test
description: Detects suspicious FromBase64String expressions in command line arguments
author: Florian Roth
references:
  - https://gist.github.com/Neo23x0/6af876ee72b51676c82a2db8d2cd3639
date: 2020/01/29
modified: 2021/11/27
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    CommandLine|contains: '::FromBase64String('
  condition: selection
falsepositives:
  - Administrative script libraries
level: high
tags:
  - attack.t1027
  - attack.defense_evasion
  - attack.t1140
  - attack.t1059.001
rule: FromBase64String command line 2020-01-29 16:05:12 +01:00			`title: FromBase64String Command Line`
			`id: e32d4572-9826-4738-b651-95fa63747e8a`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`status: test`
rule: FromBase64String command line 2020-01-29 16:05:12 +01:00			`description: Detects suspicious FromBase64String expressions in command line arguments`
			`author: Florian Roth`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`references:`
			`- https://gist.github.com/Neo23x0/6af876ee72b51676c82a2db8d2cd3639`
rule: FromBase64String command line 2020-01-29 16:05:12 +01:00			`date: 2020/01/29`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`modified: 2021/11/27`
rule: FromBase64String command line 2020-01-29 16:05:12 +01:00			`logsource:`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`category: process_creation`
			`product: windows`
rule: FromBase64String command line 2020-01-29 16:05:12 +01:00			`detection:`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`selection:`
			`CommandLine\|contains: '::FromBase64String('`
			`condition: selection`
rule: FromBase64String command line 2020-01-29 16:05:12 +01:00			`falsepositives:`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`- Administrative script libraries`
rule: FromBase64String command line 2020-01-29 16:05:12 +01:00			`level: high`
$frack113$ Change status for old rules 2021-11-27 11:33:14 +01:00			`tags:`
			`- attack.t1027`
			`- attack.defense_evasion`
			`- attack.t1140`
			`- attack.t1059.001`