Trojan.Win32.Scar.dxir / Insecure Permissions

[malvuln <malvuln13 () gmail com>]

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/68ed9d6e4f3e917ab4b91689e2890754.txt
Contact: malvuln13 () gmail com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Scar.dxir
Vulnerability: Insecure Permissions
Description: Scar.dxir creates an insecure dir named "P2" under c:\ drive
and grants change (C) permissions to the authenticated user group. Standard
users can rename the hidden "phate2.exe" file 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: 68ed9d6e4f3e917ab4b91689e2890754
Vuln ID: MVID-2021-0128
Dropped files: phate2.exe
Disclosure: 03/14/2021

Exploit/PoC:
C:\>cacls P2
C:\P2 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:\>cd P2

C:\P2>dir
 Volume in drive C has no label.

 Directory of C:\P2

File Not Found

C:\P2>dir /a
 Volume in drive C has no label.

 Directory of C:\P2

06/30/2012  05:35 PM            90,865 phate2.exe
               1 File(s)         90,865 bytes



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