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 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).