full-disclosure - [FD] Backdoor.Win32.InfecDoor.17.c / Insecure Permissions

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Message-ID: <CAAHK0WT2ikqHg1tJ_bdAMPoMjs5JAcOuHMyxkx-vJ8YLSDRF_Q@mail.gmail.com>
Date: Thu, 23 Jun 2022 22:32:17 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.InfecDoor.17.c / Insecure Permissions

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/1fd70e41918c3a75c634b1c234ec36fb.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.InfecDoor.17.c
Vulnerability: Insecure Permissions
Description: The malware writes a ".420" settings file type to c drive
granting change (C) permissions to the authenticated user group. Standard
users can rename the file dropped by the malware to disable, change its
settings or replace it with their own executable. Then wait for a
privileged user to logon to the infected machine to potentially escalate
privileges.
Family: InfecDoor
Type: PE32
MD5: 1fd70e41918c3a75c634b1c234ec36fb
Vuln ID: MVID-2022-0614
Disclosure: 06/23/2022

Exploit/PoC:
C:\>cacls Infector.420
C:\Infector.420 BUILTIN\Administrators:(ID)F
                NT AUTHORITY\SYSTEM:(ID)F
                BUILTIN\Users:(ID)R
                NT AUTHORITY\Authenticated Users:(ID)C

C:\>dir Infector.420
 Volume in drive C has no label.

 Directory of C:\

04/11/2022  03:29 AM                36 Infector.420
               1 File(s)             36 bytes
               0 Dir(s)  24,644,292,608 bytes free

C:\>type Infector.420
[My_OVER_ALL_SETTINGS]
FirsTime=0

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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