Trojan.Win32.Pasta.mca / Insecure Permissions

[malvuln <malvuln13 () gmail com>]

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/4692b129b0034fd53cd76867d9869e49.txt
Contact: malvuln13 () gmail com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Pasta.mca
Vulnerability: Insecure Permissions
Description: The malware writes an .DLL file with insecure permissions
under c:\ drive granting 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: 4692b129b0034fd53cd76867d9869e49
Vuln ID: MVID-2021-0383
Dropped files: Hook.dll
Disclosure: 11/01/2021


Exploit/PoC:
C:\>cacls Hook.dll
C:\Hook.dll BUILTIN\Administrators:(ID)F
            NT AUTHORITY\SYSTEM:(ID)F
            BUILTIN\Users:(ID)R
            NT AUTHORITY\Authenticated Users:(ID)C


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