SigmaHQ/rules/windows/process_creation/win_susp_calc.yml

title: Suspicious Calculator Usage
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
status: experimental
references:
        - https://twitter.com/ItsReallyNick/status/1094080242686312448
author: Florian Roth
date: 2019/02/09
tags:
    - attack.defense_evasion
    - attack.t1036
logsource:
        category: process_creation
        product: windows
detection:
        selection1:
                CommandLine: '*\calc.exe *'
        selection2:
                Image: '*\calc.exe'
        filter2:
                Image: '*\Windows\Sys*'
        condition: selection1 or ( selection2 and not filter2 )
falsepositives: 
        - Unknown
level: high