Discovery / credits: Malvuln - (c) 2021  
Original source:  
Threat: Backdoor.Win32.DarkKomet.artr  
Vulnerability: Insecure Permissions  
Description: The malware creates an hidden insecure dir named "Windupdt" under c:\ drive and grants change (C) permissions to the authenticated user group. Standard users can rename the executables 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: d2ee6046fd47de321d1310dccacca92b  
Vuln ID: MVID-2021-0182  
Dropped files: winupdate.exe  
Disclosure: 04/21/2021  
C:\>cacls Windupdt  
C:\Windupdt BUILTIN\Administrators:(OI)(CI)(ID)F  
NT AUTHORITY\Authenticated Users:(ID)C  
NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C  
C:\>dir Windupdt  
Volume in drive C has no label.  
Directory of C:\Windupdt  
0 File(s) 0 bytes  
2 Dir(s) 34,641,420,288 bytes free  
C:\>attrib -s -h Windupdt/*  
C:\>dir Windupdt  
Volume in drive C has no label.  
Directory of C:\Windupdt  
06/15/2012 05:07 PM 650,752 winupdate.exe  
1 File(s) 650,752 bytes  
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