Trojan-Mailfinder.Win32.VB.p / Insecure Permissions

[malvuln <malvuln13 () gmail com>]

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


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