HEUR.Hoax.Win32.FrauDrop.gen Insecure Permissions

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/1d40e72fb8cf300298df4b828b48ec29.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: HEUR.Hoax.Win32.FrauDrop.gen  
Vulnerability: Insecure Permissions  
Description: FrauDrop.gen creates an insecure dir named "newdnswatch" 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: 1d40e72fb8cf300298df4b828b48ec29  
Vuln ID: MVID-2021-0170  
Dropped files: config.bin, newdnswatch.exe  
Disclosure: 04/13/2021  
  
Exploit/PoC:  
C:\>cacls newdnswatch  
C:\newdnswatch 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 newdnswatch  
Volume in drive C has no label.  
  
Directory of C:\newdnswatch  
  
04/11/2021 10:13 PM 5,677 config.bin  
02/10/2018 01:21 AM 131,072 newdnswatch.exe  
2 File(s) 136,749 bytes  
  
  
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