Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/fe3fb2e929f95ed03233e7a4d622a28d.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: HEUR.Trojan.Win32.Generic
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: fe3fb2e929f95ed03233e7a4d622a28d
Vuln ID: MVID-2021-0274
Dropped files: config.bin, trivax1.Bin.exe
Disclosure: 07/03/2021


Exploit/PoC:
C:\>cacls trivax1.Bin
C:\trivax1.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 trivax1.Bin
 Volume in drive C has no label.

 Directory of C:\trivax1.Bin

06/02/2021  03:42 AM             3,647 config.bin
02/10/2018  03:21 AM           164,352 trivax1.Bin.exe
               2 File(s)        167,999 bytes


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