(SIGMA) SIGMA_base64_download

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title: Powershell download file from base64 url
status: experimental
description: Powershell download file from base64 url
author: Joe Security
date: 2020-04-13
id: 200072
threatname:
behaviorgroup: 1
classification: 8
mitreattack:

logsource:
      category: process_creation
      product: windows
detection:
      selection:
          CommandLine:
              - '*.downloadfile([system.text.encoding]::ascii.getstring([system.convert]::frombase64string(*'
      condition: selection
level: critical

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