Suspicious Calculator Usage

Title: Suspicious Calculator Usage
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.
References:
  -https://twitter.com/ItsReallyNick/status/1094080242686312448
Author: Florian Roth (Nextron Systems)
Date: 2019-02-09
modified:2023-11-09
Tags:

• -'attack.stealth'
• -'attack.t1036'

Logsource:

• category: process_creation
• product: windows

Detection:
  selection_1:
    CommandLine|contains: '\calc.exe '
  selection_2:
    Image|endswith: '\calc.exe'
  filter_main_known_locations:
    Image|contains:
      -':\Windows\System32\'
      -':\Windows\SysWOW64\'
      -':\Windows\WinSxS\'

  condition:selection_1 or ( selection_2 and not filter_main_known_locations )
Falsepositives:
  -Unknown
Level: high