Trojan-Spy.Win32.KeyLogger.qt Insecure Permissions

Trojan-Spy.Win32.KeyLogger.qt malware suffers from an insecure permissions vulnerability.

MD5 | 16bc591781f28b426b5ac5c4ab79ee4e

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

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

#include "windows.h"

void main(void){

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

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

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

C:\config>cacls \config
C:\config BUILTIN\Administrators:(OI)(CI)(ID)F
NT AUTHORITY\Authenticated Users:(ID)C
NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C

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

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