Friday, June 25, 2021

Trojan.Win32.SecondThought.ak Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/21cd8bab6b3569f7b375a69a37e36c50.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Trojan.Win32.SecondThought.ak
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: 21cd8bab6b3569f7b375a69a37e36c50
Vuln ID: MVID-2021-0257
Dropped files: install113.exe
Disclosure: 06/23/2021

Exploit/PoC:
C:\>cacls temporary
C:\temporary 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:\>dir temporary
Volume in drive C has no label.

Directory of C:\temporary

06/16/2021 02:51 AM 0 install113.exe
1 File(s) 0 bytes


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