full-disclosure - [FD] CosaNostra Builder / Insecure Permissions

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Message-ID: <CAAHK0WQiLC=Y1Gh64E-y_wJ1s8nZbo-pN7EsEewBjSOmngO4HA@mail.gmail.com>
Date: Mon, 24 Jan 2022 21:17:31 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] CosaNostra Builder / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/61285c988de52b7c067fb2e703f2ab83.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: CosaNostra Builder
Vulnerability: Insecure Permissions
Description: The malware creates PE files with insecure permissions when
writing 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.
Type: PE32
MD5: 61285c988de52b7c067fb2e703f2ab83
Vuln ID: MVID-2022-0471
Disclosure: 01/24/2022

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

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

 Directory of C:\

01/23/2022  11:37 PM           112,140 hate.exe
               1 File(s)        112,140 bytes
               0 Dir(s)  27,572,977,664 bytes free

Disclaimer: The information contained within this advisory is supplied
"as-is" with no warranties or guarantees of fitness of use or 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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