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


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