Potential DLL Sideloading Via JsSchHlp

Title: Potential DLL Sideloading Via JsSchHlp
Status: test
Description:Detects potential DLL sideloading using JUSTSYSTEMS Japanese word processor
References:
  -https://www.welivesecurity.com/2022/12/14/unmasking-mirrorface-operation-liberalface-targeting-japanese-political-entities/
  -http://www.windowexe.com/bbs/board.php?q=jsschhlp-exe-c-program-files-common-files-justsystem-jsschhlp-jsschhlp
Author: frack113
Date: 2022-12-14
modified:None
Tags:

• -'attack.persistence'
• -'attack.privilege-escalation'
• -'attack.execution'
• -'attack.stealth'
• -'attack.t1574.001'

Logsource:

• category: image_load
• product: windows

Detection:
  selection:
    ImageLoaded|endswith: '\JSESPR.dll'
  filter:
    ImageLoaded|startswith: 'C:\Program Files\Common Files\Justsystem\JsSchHlp\'
  condition:selection and not filter
Falsepositives:
  -Unknown
Level: medium