full-disclosure - [FD] Builder XtremeRAT v3.7 / Insecure Permissions

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Message-ID: <CAAHK0WQaXG5+yX1rO9N4J0s+U7Aja57TPQpQECe6dft8E6NQ0A@mail.gmail.com>
Date: Fri, 15 Jul 2022 17:16:47 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Builder XtremeRAT v3.7 / Insecure Permissions

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/7f314e798c150aedd9ce41ed39318f65.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Builder XtremeRAT v3.7
Vulnerability: Insecure Permissions
Description: The malware builds and writes a PE file to c drive granting
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.
Family: Xtreme
Type: PE32
MD5: 7f314e798c150aedd9ce41ed39318f65
Vuln ID: MVID-2022-0623
Disclosure: 07/15/2022

Exploit/PoC:
C:\>cacls server.exe
C:\server.exe BUILTIN\Administrators:(ID)F
              NT AUTHORITY\SYSTEM:(ID)F
              BUILTIN\Users:(ID)R
              NT AUTHORITY\Authenticated Users:(ID)C

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

 Directory of C:\

03/04/2022  02:56 AM            21,504 server.exe
               1 File(s)         21,504 bytes
               0 Dir(s)  26,072,932,352 bytes free

Disclaimer: The information contained within this advisory is supplied
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Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and that due
credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit is given to
the author. The author is not responsible for any misuse of the information
contained herein and accepts no responsibility for any damage caused by the
use or misuse of this information. The author prohibits any malicious use
of security related information or exploits by the author or elsewhere. Do
not attempt to download Malware samples. The author of this website takes
no responsibility for any kind of damages occurring from improper Malware
handling or the downloading of ANY Malware mentioned on this website or
elsewhere. All content Copyright (c) Malvuln.com (TM).
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