full-disclosure - [FD] Backdoor.Win32.Jokerdoor (TDC Mail Spy 1.0) / Insecure Permissions

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Date: Sat, 23 Jan 2021 01:11:14 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Jokerdoor (TDC Mail Spy 1.0) / Insecure
	Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/6c7b364dafe0560dfb15c9b03f1b44bd.txt
Contact: malvuln13@...il.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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credit is given to the author. The author is not responsible for any
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related information or exploits by the author or elsewhere. Do not
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