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

CVE Category Price Severity
N/A CWE-17: Code Injection N/A High
Author Risk Exploitation Type Date
TDC Mail Spy Critical Remote 2021-01-23
Our sensors found this exploit at:

Below is a copy:

Backdoor.Win32.Jokerdoor (TDC Mail Spy 1.0) / Insecure Permissions
Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

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 

C:\AccessChk>cacls C:\MailSpy
C:\MailSpy BUILTIN\Administrators:(OI)(CI)(ID)F
           NT AUTHORITY\Authenticated Users:(ID)C
           NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C

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