full-disclosure - [FD] Backdoor.Win32.Buterat.cxq / Insecure Permissions EoP

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Message-ID: <CAAHK0WT_xzMPYRrqa3MiSvZfd9bgiu9-gOdnk+kuX=NOeck-Yg@mail.gmail.com>
Date: Mon, 1 Feb 2021 13:18:09 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Buterat.cxq / Insecure Permissions EoP

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/8bfac1f52a94f36b711e20bce30161cc.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Buterat.cxq
Vulnerability: Insecure Permissions EoP
Description: This malware creates an insecure dir under c:\ drive
named "process", where it drops a random named executable and later
moves it to C:\Users\[VICTIM]\AppData\Local\Temp where it sends SYN
packets to TCP port 3000. The process dir grants change (C)
permissions to the authenticated users group.
Type: PE32
MD5: 8bfac1f52a94f36b711e20bce30161cc
Vuln ID: MVID-2021-0063
Dropped files:
Disclosure: 02/01/2021

Exploit/PoC:
C:\Users\[VICTIM]\Desktop>cacls \process
C:\process 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

Disclaimer: The information contained within this advisory is supplied
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otherwise. 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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