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VIRUS.WIN32.BANKA.A / Insecure Permissions

CVE Category Price Severity
N/A CWE-xxx Unknown High
Author Risk Exploitation Type Date
Unknown High Remote 2021-04-25
CPE
cpe:cpe:/o:microsoft:windows
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021040138

Below is a copy:

VIRUS.WIN32.BANKA.A / Insecure Permissions
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/6a3329d12323f4920dbf13afe1be6acd.txt
Contact: [email protected]
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"
MZ                @                !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


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