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From: malvuln <malvuln13 () gmail com> Date: Tue, 23 Dec 2025 01:22:37 -0500

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2025
Original source:
https://malvuln.com/advisory/3d9821cbe836572410b3c5485a7f76ca.txt
Malvuln Intelligence Feed: https://intel.malvuln.com/
Contact: malvuln13 () gmail com
Media: x.com/malvuln

Threat: Backdoor.Win32.Poison.jh
Vulnerability: Insecure Permissions
Description: The malware creates the directory 28463 under
C:\Windows\SysWOW64, granting Full (F) permissions to the Everyone
user group. This allows any local user to modify or replace any
dropped files, enabling trivial malware disruption or execution
hijacking. This reflects poor operational security exposing malware
components to local tampering.
Family: Poison
Type: PE32
Attack-pattern TTP: File and Directory Permissions Modification (T1222.001)
MD5: 3d9821cbe836572410b3c5485a7f76ca
SHA256: 2229d26afafb4b7fe1eaaa92ce1251c00eda9bac3f1371c470e7bbd5ae0a5bf9
Vuln ID: MVID-2025-0704
Dropped files: YJBE.exe
Disclosure: 12/23/2025

Exploit/PoC:
C:\>cacls C:\Windows\SysWOW64\28463\YJBE.exe
C:\Windows\SysWOW64\28463\YJBE.exe Everyone:(ID)F

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information. The author prohibits any malicious use of security
related information or exploits by the author or elsewhere. Do not
attempt to download Malware samples. The author of this website takes
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Malware handling or the downloading of ANY Malware mentioned on this
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• Backdoor.Win32.Poison.jh / Insecure Permissions malvuln (Dec 27)