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

Lumma Stealer Upgraded with PowerShell Tools and Advanced Evasion Techniques

Sophos Managed Detection and Response (MDR) in September 2024, the notorious Lumma Stealer malware has…

6 hours ago

New Noodlophile Malware Spreads Through Fake AI Video Generation Platforms

Cybercriminals have unleashed a new malware campaign using fake AI video generation platforms as a…

6 hours ago

Kimsuky Hacker Group Deploys New Phishing Techniques and Malware Campaigns

The North Korean state-sponsored Advanced Persistent Threat (APT) group Kimsuky, also known as “Black Banshee,”…

6 hours ago

APT37 Hackers Use Weaponized LNK Files and Dropbox for Command-and-Control Operations

The North Korean state-sponsored hacking group APT37, also known as ScarCruft, launched a spear phishing…

6 hours ago

Open Source Linux Firewall IPFire 2.29 – Core Update 194 Released: What’s New!

IPFire, the powerful open-source firewall, has unveiled its latest release, IPFire 2.29 – Core Update…

10 hours ago

Threat Actors Leverage DDoS Attacks as Smokescreens for Data Theft

Distributed Denial of Service (DDoS) attacks, once seen as crude tools for disruption wielded by…

10 hours ago