full-disclosure - [FD] Virus.Win32.Banka.a / Insecure Permissions

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Date: Fri, 23 Apr 2021 17:04:15 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Virus.Win32.Banka.a / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/6a3329d12323f4920dbf13afe1be6acd.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Virus.Win32.Banka.a
Vulnerability: Insecure Permissions
Description: Banka.a creates an insecure dir named "Anak Bangka Hidden
Folders" under c:\ drive and grants change (C) permissions to the
authenticated user group. The virus also drops two files named "Bangka
Island.jpg" and "Pulau Bangka.jpg" under c:\ which are actually
executables. Standard users can replace the "Pasir Padi.pif" shortcut
created by the malware to disable it or replace it with their own. Then
wait for a privileged user to logon to the infected machine to potentially
escalate privileges.

Type: PE32
MD5: 6a3329d12323f4920dbf13afe1be6acd
Vuln ID: MVID-2021-0184
Dropped files: "Pasir Padi.pif", "Bangka Island.jpg", "Pulau Bangka.jpg"
Disclosure: 04/23/2021

Exploit/PoC:
C:\>type "\Anak Bangka Hidden Folders\Pasir Padi.pif"
MZÉ        ╕      @          Ç   ║ ┤  ═!╕ L═!This program cannot be run in
DOS mode.

C:\>cacls "\Anak Bangka Hidden Folders\Pasir Padi.pif"
C:\Anak Bangka Hidden Folders\Pasir Padi.pif BUILTIN\Administrators:(ID)F
                                             NT AUTHORITY\SYSTEM:(ID)F
                                             BUILTIN\Users:(ID)R
                                             NT AUTHORITY\Authenticated
Users:(ID)C

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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