Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/16fab35b51f9e6447f2a8c04db4ebe93.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Frauder.jt
Vulnerability: Insecure Permissions
Description: The malware writes an extensionless PE file named "x" with insecure permissions under 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.
Type: PE32
MD5: 16fab35b51f9e6447f2a8c04db4ebe93
Vuln ID: MVID-2022-0481
Dropped files: x
Disclosure: 02/08/2022

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


C:\>dir x
 Volume in drive C has no label.

 Directory of C:\

02/09/2013  01:43 PM            25,088 x
               1 File(s)         25,088 bytes
               0 Dir(s)  27,505,713,152 bytes free

C:\>type x
MZÉ    !This program cannot be run in DOS mode.


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