full-disclosure - [FD] Trojan-Dropper.Win32.Scrop.dyi / Insecure Permissions

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Message-ID: <CAAHK0WQvf6yHFENik-54M5RzVY1Bgxoj00tCBOs9VLikhXbTHg@mail.gmail.com>
Date: Fri, 25 Jun 2021 22:34:35 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan-Dropper.Win32.Scrop.dyi / Insecure Permissions

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

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).

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