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List:       full-disclosure
Subject:    [FD] Worm.Win32.Ngrbot.acno / Insecure Permissions
From:       malvuln <malvuln13 () gmail ! com>
Date:       2021-03-24 20:13:25
Message-ID: CAAHK0WS3_dmhF_ChRomtsn1hPXYVTFQe1awOLkCtSVZ6WLG=ew () mail ! gmail ! com
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Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/0b3c2053a7c09aa25ba81f2bdebbb873.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Worm.Win32.Ngrbot.acno
Vulnerability: Insecure Permissions
Description: Creates a dir named "ffffd76" under c:\ drive and grants
change (C) permissions to the authenticated user group. Standard users can
rename 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: 0b3c2053a7c09aa25ba81f2bdebbb873
Vuln ID: MVID-2021-0144
Dropped files: ffffd76.exe
Disclosure: 03/24/2021


Exploit/PoC:
C:\>cacls ffffd76
C:\ffffd76 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 ffffd76

C:\ffffd76>dir
 Volume in drive C has no label.

 Directory of C:\ffffd76

03/24/2021  12:20 AM           215,552 ffffd76.exe
               1 File(s)        215,552 bytes
               0 Dir(s)  15,931,383,808 bytes free


Disclaimer: The information contained within this advisory is supplied
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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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