Newly Patched Windows Zero-day Lets Hackers Take Complete Control of the Windows System

Very recently patched Windows zero-day vulnerability (CVE-2019-0859) in win32k.sys let hackers take control of unpatched Windows systems.

Security researchers from Kaspersky team recent addressed this Zero-day vulnerability in win32k.sys while it made an attempt to exploit one of their customers Microsoft Windows operating system.

A Local Privilege Escalation vulnerability was then reported later to Microsoft and released a patch for Zero-day along with 74 other security vulnerabilities.

This is actually the fifth vulnerability that consecutive exploited Local Privilege Escalation vulnerability in Windows that uncovered by Kaspersky team researchers, here the previous zero-days in very recent past.

Zero-day Exploit Process in Windows win32k.sys

This Vulnerability is presented in the CreateWindowEx, a function that
creates an overlapped, pop-up, or child window with an extended style.

Attackers Exploiting this elevation of privilege vulnerability in Windows when Win32k component fails to properly handle objects in memory.

A PowerShell script mainly used by attackers for the post-exploitation process with a Base64 encoded command. 

The ultimate goal of this PowerShell script to download a second-stage script from https//pastebin.com.

This Second stage of the PowerShell executes the final stage which is also a PowerShell Script that you can see in below image.

Third stage PowerShell script

According to Kaspersky, the third script is very simple and does the following:

  • Unpacks shellcode
  • Allocates executable memory
  • Copies shellcode to the allocated memory
  • Calls CreateThread to execute shellcode

At the final stage, the shellcode is to make a trivial HTTP reverse shell that leads to attackers gain complete control of the targeted victims Windows system.

You can follow us on LinkedinTwitterFacebook for daily Cybersecurity updates also you can take the Best Cybersecurity courses online to keep your self-updated.

Also Read:

Microsoft Hacked – Hackers Compromised The Microsoft Employee’s Account to Gain Access the Customers Email

Unpatched Internet Explorer Zero-day Vulnerability Lets Attackers Hack Windows PC & Steal Files

Balaji

BALAJI is an Ex-Security Researcher (Threat Research Labs) at Comodo Cybersecurity. Editor-in-Chief & Co-Founder - Cyber Security News & GBHackers On Security.

Recent Posts

Hack The box “Ghost” Challenge Cracked – A Detailed Technical Exploit

Cybersecurity researcher "0xdf" has cracked the "Ghost" challenge on Hack The Box (HTB), a premier…

15 hours ago

Sec-Gemini v1 – Google’s New AI Model for Cybersecurity Threat Intelligence

Google has unveiled Sec-Gemini v1, an AI model designed to redefine cybersecurity operations by empowering…

15 hours ago

U.S. Secures Extradition of Rydox Cybercrime Marketplace Admins from Kosovo in Major International Operation

The United States has successfully extradited two Kosovo nationals, Ardit Kutleshi, 26, and Jetmir Kutleshi,…

20 hours ago

Ivanti Fully Patched Connect Secure RCE Vulnerability That Actively Exploited in the Wild

Ivanti has issued an urgent security advisory for CVE-2025-22457, a critical vulnerability impacting Ivanti Connect…

2 days ago

Beware! Weaponized Job Recruitment Emails Spreading BeaverTail and Tropidoor Malware

A concerning malware campaign was disclosed by the AhnLab Security Intelligence Center (ASEC), revealing how…

2 days ago

EncryptHub Ransomware Uncovered Through ChatGPT Use and OPSEC Failures

EncryptHub, a rapidly evolving cybercriminal entity, has come under intense scrutiny following revelations of operational…

2 days ago