Trojan-Mailfinder.Win32.VB.p malware suffers from an insecure permissions vulnerability.
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 BUILTINAdministrators:(OI)(CI)(ID)F
NT AUTHORITYSYSTEM:(OI)(CI)(ID)F
BUILTINUsers:(OI)(CI)(ID)R
NT AUTHORITYAuthenticated Users:(ID)C
NT AUTHORITYAuthenticated 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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