Trojan-Downloader.Win32.Genome.omht / Insecure Permissions

[malvuln <malvuln13 () gmail com>]

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/01055838361f534ab596b56a19c70fef.txt
Contact: malvuln13 () gmail com
Media: twitter.com/malvuln

Threat: Trojan-Downloader.Win32.Genome.omht
Vulnerability: Insecure Permissions
Description: Genome.omht creates an insecure dir named "wjmd97" 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: 01055838361f534ab596b56a19c70fef
Vuln ID: MVID-2021-0165
Dropped files: Jmd2PDF.exe, Receptor.exe, UpdateVIReceptor.exe
Disclosure: 04/07/2021


Exploit/PoC:
C:\>cacls wjmd97
C:\wjmd97 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 wjmd97

C:\wjmd97>dir
 Volume in drive C has no label.

 Directory of C:\wjmd97

03/11/2016  08:21 AM            73,728 Jmd2PDF.exe
12/19/2017  08:16 AM        17,588,224 Receptor.exe
06/24/2013  12:32 PM           578,629 UpdateVIReceptor.exe
               3 File(s)     18,240,581 bytes


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