title: FromBase64String Command Line
ruletype: Sigma
author: Florian Roth
date: 2020/01/29
description: Detects suspicious FromBase64String expressions in command line arguments
detection:
  SELECTION_1:
    EventID: 1
  SELECTION_2:
    CommandLine: '*::FromBase64String(*'
  condition: (SELECTION_1 and SELECTION_2)
falsepositives:
- Administrative script libraries
id: e32d4572-9826-4738-b651-95fa63747e8a
level: high
logsource:
  category: process_creation
  product: windows
modified: 2021/11/27
references:
- https://gist.github.com/Neo23x0/6af876ee72b51676c82a2db8d2cd3639
status: test
tags:
- attack.t1027
- attack.defense_evasion
- attack.t1140
- attack.t1059.001