Backdoor.Win32.Mechbot.a malware suffers from an insecure permissions vulnerability.
64ea9b60938db7d08ee70a6e3bbc978fDiscovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/8c9e7906d0ad5d0f2267be0057f2a8e3.txt
Contact: [email protected]
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).