Backdoor.Win32.Jokerdoor (TDC Mail Spy 1.0) / Insecure Permissions

[malvuln <malvuln13 () gmail com>]

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/6c7b364dafe0560dfb15c9b03f1b44bd.txt
Contact: malvuln13 () gmail com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Jokerdoor (TDC Mail Spy 1.0)
Vulnerability: Insecure Permissions
Description: This backdoor creates a dir under C: with change
permissions granted to authenticated users group.
Type: PE32
MD5: 6c7b364dafe0560dfb15c9b03f1b44bd
Vuln ID: MVID-2021-0048
Dropped files: Spy.exe
Disclosure: 01/23/2021


Exploit/PoC:
C:\AccessChk>cacls C:\MailSpy
C:\MailSpy 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


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