sigmamediumHunting

Potential DLL Sideloading Via JsSchHlp

Detects potential DLL sideloading using JUSTSYSTEMS Japanese word processor

MITRE ATT&CK

defense-evasionpersistenceprivilege-escalation

Detection Query

selection:
  ImageLoaded|endswith: \JSESPR.dll
filter:
  ImageLoaded|startswith: C:\Program Files\Common Files\Justsystem\JsSchHlp\
condition: selection and not filter

Author

frack113

Created

2022-12-14

Data Sources

windowsImage Load Events

Platforms

windows

References

Tags

attack.defense-evasionattack.persistenceattack.privilege-escalationattack.t1574.001

Raw Content

title: Potential DLL Sideloading Via JsSchHlp
id: 68654bf0-4412-43d5-bfe8-5eaa393cd939
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
tags:
    - attack.defense-evasion
    - attack.persistence
    - attack.privilege-escalation
    - 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