full-disclosure - [FD] Backdoor.Win32.Mechbot.a / Insecure Permissions

Open Source and information security mailing list archives

Message-ID: <CAAHK0WSOUQ9F4x-CETiqRvdkFkJTmWZGn1WFcb8kzZkFHO+DWA@mail.gmail.com>
Date: Sat, 11 Dec 2021 16:15:15 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Mechbot.a / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/8c9e7906d0ad5d0f2267be0057f2a8e3.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Mechbot.a
Vulnerability: Insecure Permissions
Description: The malware creates a 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: 8c9e7906d0ad5d0f2267be0057f2a8e3
Vuln ID: MVID-2021-0417
Disclosure: 12/11/2021

Exploit/PoC:
C:\>cacls "TitanZone BOT"
C:\TitanZone BOT 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 "TitanZone BOT"
 Volume in drive C has no label.

 Directory of C:\TitanZone BOT

06/15/2003  11:24 AM               591 checkmech
06/15/2003  11:24 AM            21,854 configure
11/19/2021  12:13 AM    DIR          CONTRIB
05/10/2003  02:07 PM           201,216 CYGWIN1.DLL
05/10/2003  02:07 PM             4,305 GENUSER
07/02/2003  08:44 PM                35 LinkEvents
06/15/2003  11:24 AM             1,391 Makefile
05/10/2003  02:07 PM            22,882 mech.help
07/02/2003  08:40 PM                 6 MECH.PID
07/02/2003  08:45 PM             2,464 MECH.SET
05/10/2003  02:07 PM               796 MKINDEX
11/19/2021  12:13 AM    DIR          randfiles
11/19/2021  12:13 AM    DIR          SRC
06/26/2003  09:09 PM               213 titanzone.bat
11/19/2021  12:13 AM    DIR          TOOLS
05/10/2003  02:07 PM           192,512 WinMech.exe
07/02/2003  08:45 PM               155 winmech.users

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).

_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives