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Trojan.Win32.SecondThought.ak / Insecure Permissions

CVE Category Price Severity
N/A CWE-264 Depends on negotiation High
Author Risk Exploitation Type Date
Unknown High Remote 2021-06-24
CPE
cpe:cpe:/vuln:trojan:win32:secondthought-ak-insecure-permissions
CVSS EPSS EPSSP
CVSS:4.0/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021060131

Below is a copy:

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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