Backdoor.Win32.Cyn.20 Insecure Permissions

Backdoor.Win32.Cyn.20 malware suffers from an insecure permissions vulnerability.

MD5 | ec8928cddb99ad4862c9cdb1505fc61d

Discovery / credits: Malvuln - (c) 2022
Original source:
Contact: [email protected]

Threat: Backdoor.Win32.Cyn.20
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: Cyn
Type: PE32
MD5: 3dd1da64e306cae0409e154e15dd1b80
Vuln ID: MVID-2022-0524
Disclosure: 03/25/2022

C:\>cacls "Program Filessystem.EXE"
C:\Program Filessystem.EXE BUILTIN\Administrators:(ID)F
NT AUTHORITY\Authenticated Users:(ID)C

C:\>dir "Program Filessystem.EXE"
Volume in drive C has no label.

Directory of C:\

03/22/2022 02:35 AM 0 Program Filessystem.EXE
1 File(s) 0 bytes
0 Dir(s) 24,893,874,176 bytes free

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