Backdoor.Win32.Curioso.zp Insecure Permissions

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/1ae08493913b2a0c8cbcb0541da5a8bc.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Curioso.zp  
Vulnerability: Insecure Permissions  
Description: The malware creates a dir 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: 1ae08493913b2a0c8cbcb0541da5a8bc  
Vuln ID: MVID-2021-0402  
Disclosure: 11/21/2021  
  
Exploit/PoC:  
C:\>cacls test  
C:\test 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  
  
  
C:\>dir /a test  
Volume in drive C has no label.  
  
Directory of C:\test  
  
02/17/2013 03:34 PM 733,184 svchost.exe  
1 File(s) 733,184 bytes  
  
  
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