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Worm.Win32.Ngrbot.acno Insecure Permissions

Worm.Win32.Ngrbot.acno Insecure Permissions
Posted Mar 25, 2021
Authored by malvuln | Site malvuln.com

Worm.Win32.Ngrbot.acno malware suffers from an insecure permissions vulnerability.

tags | exploit, worm
systems | windows
MD5 | b1fa08112e7ed4c8429cd2487b58add7

Worm.Win32.Ngrbot.acno Insecure Permissions

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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 "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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