full-disclosure - [FD] Backdoor.Win32.Agent.baol / Insecure Permissions

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Message-ID: <CAAHK0WTzdGSUVRW_tkO=pc435MbuNq01pyfDjKCfBLupfdL4Kg@mail.gmail.com>
Date: Mon, 21 Feb 2022 20:58:02 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Agent.baol / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/1f84a5305b65d7f6aa3afa7e2f2bda0e.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Agent.baol
Vulnerability: Insecure Permissions
Description: The malware writes several PE files 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: 1f84a5305b65d7f6aa3afa7e2f2bda0e
Vuln ID: MVID-2022-0495
Disclosure: 02/21/2022

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

C:\>dir NB_Server.exe
 Volume in drive C has no label.

 Directory of C:\

02/11/2022  02:10 AM            70,411 NB_Server.exe
               1 File(s)         70,411 bytes
               0 Dir(s)  26,507,804,672 bytes free

C:\>cacls ds1.exe
C:\ds1.exe BUILTIN\Administrators:(ID)F
           NT AUTHORITY\SYSTEM:(ID)F
           BUILTIN\Users:(ID)R
           NT AUTHORITY\Authenticated Users:(ID)C

C:\>dir ds1.exe
 Volume in drive C has no label.

 Directory of C:\

02/11/2022  02:10 AM                 0 ds1.exe
               1 File(s)              0 bytes
               0 Dir(s)  26,506,407,936 bytes free

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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