Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/6f484fea8f6bb3974185fc856f37541b.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Trojan-Spy.Win32.SpyEyes.hqd
Vulnerability: Insecure Permissions 
Description: The malware creates a dir with insecure permissions under c:\ drive and grants 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: 6f484fea8f6bb3974185fc856f37541b
Vuln ID: MVID-2021-0299
Disclosure: 07/18/2021

Exploit/PoC:
C:\>cacls Recycle.Bin
C:\Recycle.Bin 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 Recycle.Bin
 Volume in drive C has no label.

 Directory of C:\Recycle.Bin

06/30/2021  03:11 AM            17,864 config.bin
02/10/2018  01:21 AM           242,688 Recycle.Bin.exe
               2 File(s)        260,552 bytes


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