Potential DLL Sideloading Via JsSchHlp

calendar Apr 28, 2026 · attack.persistence attack.privilege-escalation attack.execution attack.stealth attack.t1574.001  ·
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Detects potential DLL sideloading using JUSTSYSTEMS Japanese word processor

Sigma rule (View on GitHub)

 1title: Potential DLL Sideloading Via JsSchHlp
 2id: 68654bf0-4412-43d5-bfe8-5eaa393cd939
 3status: test
 4description: Detects potential DLL sideloading using JUSTSYSTEMS Japanese word processor
 5references:
 6    - https://www.welivesecurity.com/2022/12/14/unmasking-mirrorface-operation-liberalface-targeting-japanese-political-entities/
 7    - http://www.windowexe.com/bbs/board.php?q=jsschhlp-exe-c-program-files-common-files-justsystem-jsschhlp-jsschhlp
 8author: frack113
 9date: 2022-12-14
10tags:
11    - attack.persistence
12    - attack.privilege-escalation
13    - attack.execution
14    - attack.stealth
15    - attack.t1574.001
16logsource:
17    category: image_load
18    product: windows
19detection:
20    selection:
21        ImageLoaded|endswith: '\JSESPR.dll'
22    filter:
23        ImageLoaded|startswith: 'C:\Program Files\Common Files\Justsystem\JsSchHlp\'
24    condition: selection and not filter
25falsepositives:
26    - Unknown
27level: medium

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