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Date: Wed, 10 Mar 2021 21:08:25 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan-Spy.Win32.KeyLogger.qt / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/de613b96174056ef22b42e112d0e61a5.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan-Spy.Win32.KeyLogger.qt
Vulnerability: Insecure Permissions
Description: KeyLogger.qt creates a hidden insecure dir named "config"
under c:\ drive and grants change (C) permissions to the authenticated user
group. Standard users can rename "rundll32.exe" dropped by the keylogger to
disable it or replace with their own executable. Then wait for a privileged
user to logon to the infected machine to potentially escalate privileges.
Type: PE32
MD5: de613b96174056ef22b42e112d0e61a5
Vuln ID: MVID-2021-0124
Dropped files: rundll32.exe
Disclosure: 03/10/2021

Exploit/PoC:
#include "windows.h"

void main(void){

system("attrib -s -h C:\\config\\rundll32.exe");
system("rename C:\\config\\rundll32.exe 13");

Sleep(1000);
puts("[+] Disabled by renaming C:\\config\\rundll32.exe to 13 ...\n");
Sleep(1000);

puts("[+] Trojan-Spy.Win32.KeyLogger.qt PWNED!");
puts("[+] MD5: de613b96174056ef22b42e112d0e61a5");
puts("[+] By Malvuln");
system("pause");
}

C:\config>cacls \config
C:\config 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:\config>dir
 Volume in drive C has no label.

 Directory of C:\config

File Not Found

C:\config>dir /a
 Volume in drive C has no label.

 Directory of C:\config

06/16/2012  12:54 AM           585,778 rundll32.exe
               1 File(s)        585,778 bytes


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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