Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/317cd84b5c0d11a9c3aacdfe2bb6031c.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Scar.dulk
Vulnerability: Insecure Permissions
Description: The malware creates an insecure dir named "xzzzs" 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: 317cd84b5c0d11a9c3aacdfe2bb6031c
Vuln ID: MVID-2021-0227
Dropped files: zxzz.exe
Disclosure: 05/28/2021

Exploit/PoC:
C:\>dir xzzzs
 Volume in drive C has no label.

 Directory of C:\xzzzs

03/02/2021  02:08 AM           434,688 zxzz.exe
               1 File(s)        434,688 bytes

C:\>cacls xzzzs
C:\xzzzs 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


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