full-disclosure - [FD] Backdoor.Win32.Wuca.nz / Insecure Permissions

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Message-ID: <CAAHK0WROznGb2NEXRdeZkpZqPiryF7HHTH3foqJSJV=8EGYOJw@mail.gmail.com>
Date: Tue, 8 Jun 2021 14:49:03 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Wuca.nz / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/378b225b07979e12062f86ab1fbaf2ed.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Wuca.nz
Vulnerability: Insecure Permissions
Description: The malware creates a VBS script "112.vbe" 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: 378b225b07979e12062f86ab1fbaf2ed
Vuln ID: MVID-2021-0241
Dropped files: 112.vbe
Disclosure: 06/08/2021

Exploit/PoC:
C:\>cacls 112.vbe
C:\112.vbe BUILTIN\Administrators:(ID)F
           NT AUTHORITY\SYSTEM:(ID)F
           BUILTIN\Users:(ID)R
           NT AUTHORITY\Authenticated Users:(ID)C

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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