Builder XtremeRAT v3.7 / Insecure Permissions

[malvuln <malvuln13 () gmail com>]

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


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