Backdoor.Win32.Prorat.cwx / Insecure Permissions

[malvuln <malvuln13 () gmail com>]

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/2d81bf2c55c81778533b55fb444d4dc6.txt
Contact: malvuln13 () gmail com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Prorat.cwx
Vulnerability: Insecure Permissions
Description: The malware writes a ".EXE" file with insecure permissions 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: Prorat
Type: PE32
MD5: 2d81bf2c55c81778533b55fb444d4dc6
Vuln ID: MVID-2022-0545
Disclosure: 04/14/2022

Exploit/PoC:
C:\>cacls a.exe
C:\a.exe BUILTIN\Administrators:(ID)F
         NT AUTHORITY\SYSTEM:(ID)F
         BUILTIN\Users:(ID)R
         NT AUTHORITY\Authenticated Users:(ID)C

C:\dump>dir /a \a.exe
 Volume in drive C has no label.

 Directory of C:\

04/08/2022  02:31 AM           368,609 a.exe
               1 File(s)        368,609 bytes

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