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Date: Tue, 5 Oct 2021 19:55:30 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Virus.Win32.Renamer.a / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/001fc372acc853aa1cf92588a43a7deb.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Virus.Win32.Renamer.a
Vulnerability: Insecure Permissions
Description: The malware creates an dir with insecure permissions
under c:\ drive granting 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: 001fc372acc853aa1cf92588a43a7deb
Vuln ID: MVID-2021-0352
Dropped files: GUESSNUM.EXE
Disclosure: 10/04/2021


Exploit/PoC:
C:\>cacls "RECYCLER.{645FF040-5081-101B-9F08-00AA002F954E}"
C:\RECYCLER.{645FF040-5081-101B-9F08-00AA002F954E}
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 "RECYCLER.{645FF040-5081-101B-9F08-00AA002F954E}"
 Volume in drive C has no label.

 Directory of C:\RECYCLER.{645FF040-5081-101B-9F08-00AA002F954E}

06/17/2012  06:06 AM           818,211 GUESSNUM.EXE
               1 File(s)        818,211 bytes


Disclaimer: The information contained within this advisory is supplied
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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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