Trojan-Mailfinder.Win32.VB.p MVID-2022-0616 Insecure Permissions

`Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022  
Original source: https://malvuln.com/advisory/20e438d84aa2828826d52540d80bf7f.txt  
Contact: [email protected]  
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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