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Date: Wed, 24 Mar 2021 16:12:18 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Worm.Win32.Ngrbot.abpr / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/ed1e47f62fa93f2fd2f4fbcfdd0f1c10.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Worm.Win32.Ngrbot.abpr
Vulnerability: Insecure Permissions
Description: Ngrbot.abpr creates a dir named "Win.Msi" under c:\ drive and
grants change (C) permissions to the authenticated user group. Standard
users can rename several of the executables 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: ed1e47f62fa93f2fd2f4fbcfdd0f1c10
Vuln ID: MVID-2021-0142
Dropped files: alg.exe, cssrs.exe,  System.exe,
Disclosure: 03/24/2021


Exploit/PoC:
C:\>cacls C:\Win.Msi
C:\Win.Msi 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


C:\>cd Win.Msi

C:\Win.Msi>dir
 Volume in drive C has no label.

 Directory of C:\Win.Msi

05/30/2008  12:25 PM               132 3proxy.cfg
12/06/2011  11:56 AM           184,832 alg.exe
12/06/2011  11:59 AM           315,392 cssrs.exe
10/17/2011  12:37 PM               494 DiskDoctor.lnk
04/17/2009  07:40 AM           330,752 System.exe
               5 File(s)        831,602 bytes
               0 Dir(s)  15,876,706,304 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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