Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/1d40e72fb8cf300298df4b828b48ec29.txt
Contact: malvuln13@gmail.com
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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