This vulnerability allows the malware to install itself persistently, modify critical system settings, or potentially escalate privileges without requiring administrator credentials. By exploiting weak permissions, Poison.jh can establish a strong foothold and maintain its presence on the compromised system.
Once active, it grants remote attackers unauthorized access and control, enabling them to execute arbitrary commands, steal sensitive data, or deploy further malicious payloads. Proper permission management and regular security audits are crucial to prevent such exploitation.
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:
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
Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this 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 no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).