Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/af207a19fbe313e3f7e123b6b2acffd4.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Trojan-Dropper.Win32.Scrop.dyi
Vulnerability: Insecure Permissions 
Description: The malware creates a hidden dir named "gFnFILdc" with insecure permissions under c:\ drive and grants change (C) permissions to the authenticated user group. Standard users can rename the executable dropped by the malware to disable it or replace it with their own executable. Then wait for a privileged user to logon to the infected machine to potentially escalate privileges.
Type: PE32
MD5: af207a19fbe313e3f7e123b6b2acffd4
Vuln ID: MVID-2021-0262
Dropped files: VsPsGUhq.exe
Disclosure: 06/25/2021


Exploit/PoC:
C:\>cacls gFnFILdc
C:\gFnFILdc BUILTIN\Administrators:(OI)(CI)(ID)F
            NT AUTHORITY\SYSTEM:(OI)(CI)(ID)F
            BUILTIN\Users:(OI)(CI)(ID)R
            NT AUTHORITY\Authenticated Users:(ID)C
            NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C


C:\>dir /a gFnFILdc
 Volume in drive C has no label.

 Directory of C:\gFnFILdc

11/29/2017  08:39 AM         1,241,650 VsPsGUhq.exe
               1 File(s)      1,241,650 bytes


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