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Date: Mon, 12 Jul 2021 22:13:34 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.IRC.Ataka.a / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/2da85579b259e6de86590e067003e064.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.IRC.Ataka.a
Vulnerability: Insecure Permissions
Description: The malware creates a dir with insecure permissions under c:\
drive and grants 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: 2da85579b259e6de86590e067003e064
Vuln ID: MVID-2021-0283
Disclosure: 07/12/2021

Exploit/PoC:
C:\>cacls Winnt
C:\Winnt 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:\>dir \Winnt\system32
 Volume in drive C has no label.

 Directory of C:\Winnt\system32

05/10/2002  08:17 PM                 2 1433.txt
06/08/2021  02:57 AM             2,456 ght.dll
04/06/2002  10:40 AM                13 hajr.drv
05/09/2002  08:17 PM            29,930 iexplorer4.cab
11/26/2000  09:45 PM            24,576 Msboot.exe
11/03/2000  03:21 PM           560,128 msflxgd.exe
06/08/2021  02:04 AM             3,769 netv.ocx
04/28/2002  05:02 PM             1,571 proxy.reg
09/04/2001  12:39 PM           900,608 ProxyPlus.exe
05/10/2000  09:22 PM            87,584 Rar.exe
04/07/2002  11:09 PM                12 smtp.txt
04/11/2002  07:08 PM               341 syscribe.txt
04/28/2002  05:01 PM               144 wroxy.reg
              13 File(s)      1,611,134 bytes


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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