Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/2da85579b259e6de86590e067003e064.txt
Contact: malvuln13@gmail.com
Media: twitter.co 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 BUILTINAdministrators:(OI)(CI)(ID)F
NT AUTHORITYSYSTEM:(OI)(CI)(ID)F
BUILTINUsers:(OI)(CI)(ID)R
NT AUTHORITYAuthenticated Users:(ID)C
NT AUTHORITYAuthenticated Users:(OI)(CI)(IO)(ID)C

C:>dir Winntsystem32
Volume in drive C has no label.

Directory of C:Winntsystem32

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).