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Date: Sat, 23 Jan 2021 01:07:05 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Noknok.60 / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/ecaf6a123fdf1f5660692dfc4c67a933.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Noknok.60
Vulnerability: Insecure Permissions
Description: When generating an executable you can specify a directory
to write the file, the malware then grants change (C) permissions to
authenticated users group.
Type: PE32
MD5: ecaf6a123fdf1f5660692dfc4c67a933
Vuln ID: MVID-2021-0049
Disclosure: 01/23/2021

Exploit/PoC:
C:\>cacls c:\temp
c:\temp 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


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advisory, provided that it is not altered except by reformatting it,
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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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