title: Suspicious Calculator Usage
id: 737e618a-a410-49b5-bec3-9e55ff7fbc15
status: test
description: Detects suspicious use of calc.exe with command line parameters or in a suspicious directory, which is likely caused by some PoC or detection evasion
author: Florian Roth
references:
  - https://twitter.com/ItsReallyNick/status/1094080242686312448
date: 2019/02/09
modified: 2021/11/27
logsource:
  category: process_creation
  product: windows
detection:
  selection1:
    CommandLine|contains: '\calc.exe '
  selection2:
    Image|endswith: '\calc.exe'
  filter2:
    Image|contains: '\Windows\Sys'
  condition: selection1 or ( selection2 and not filter2 )
falsepositives:
  - Unknown
level: high
tags:
  - attack.defense_evasion
  - attack.t1036
