full-disclosure - [FD] Trojan-Mailfinder.Win32.VB.p / Insecure Permissions

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Message-ID: <CAAHK0WRh=XyHUuMRU_5D+2XpjYdh3QHM0TcJmULX45tUJPW-nw@mail.gmail.com>
Date: Thu, 23 Jun 2022 22:31:24 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan-Mailfinder.Win32.VB.p / Insecure Permissions

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/20e438d84aa2828826d52540d80bf7f.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan-Mailfinder.Win32.VB.p
Vulnerability: Insecure Permissions
Description:  The malware writes a dir with multiple PE files to 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.
Family: VB
Type: PE32
MD5: 20e438d84aa2828826d52540d80bf7fa
Vuln ID: MVID-2022-0616
Disclosure: 06/23/2022

Exploit/PoC:
C:\>cacls IMB
C:\IMB 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 IMB
 Volume in drive C has no label.

 Directory of C:\IMB

09/12/2003  09:07 PM           140,288 comdlg32.ocx
06/16/2004  01:17 PM           282,624 IMB.exe
09/12/2003  09:07 PM         1,388,544 msvbvm60.dll
09/12/2003  09:07 PM           108,336 MSWINSCK.OCX
09/15/2003  05:16 PM               192 Readme.txt
10/04/2001  12:16 AM           147,483 scrrun.dll
10/04/2001  12:16 AM            17,920 stdole2.tlb
09/12/2003  09:07 PM             2,864 winsock.dll
               8 File(s)      2,088,251 bytes

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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