Win32:Downloader-PKU

Win32:Downloader-PKU is a heuristic detection for a Trojan that will communicate with a remote hosts and download other malware. This kind of Trojan is used for a variety of purposes. Most common is to download threat such as password-stealing malware. It is also use to deploy other malware also from the same group. Other attackers may utilize this Trojan to download and install rogue software on the computer.

There are instances that antivirus programs may fail to notice Win32:Downloader-PKU. Due to its rootkit function, the Trojan may hide its presence while operating inside the infected computer. With this technique, the threat appends its code to legitimate Windows processes so that only only visible item can be seen running on the computer. The threat may also target Windows driver files as its cradle. Running the device using this driver also executes the code of Win32:Downloader-PKU.

Because Win32:Downloader-PKU is a generic detection, there are no uniform symptoms that user may witness on the PC. Payload of this malware may vary from one version to another. Only visible sign is a frequent alert publish by the installed anti-virus software.

TypeTrojan
Sub-TypeRootkit
OS AffectedWindows XP, Windows Vista, Windows 7

What are the Symptoms of Win32:Downloader-PKU Infection?

Due to the nature of this Trojan, there are no typical symptoms when it infects a computer aside from a constant alert coming from installed anti-virus program. Here is a sample screenshot of how security software averts Win32:Downloader-PKU.

Win32:Downloader-PKU Avast Detection

Follow these Procedures to Remove Win32:Downloader-PKU

Procedure 1: Start Computer in Safe Mode

Restart your computer in Safe Mode with Networking

- After turning On the power of the computer, just before Windows start, press F8. This is a quick process, so you must press F8 button very timely. Failure to enter this mode will start Windows normally. In that case, you need to turn off the PC again and repeat the process.

- From the selections, choose Safe Mode with Networking. Please use keyboard's arrow up/down to navigate between selections and press Enter to proceed. Safe Mode boots slower than normal and your screen will be in low-resolution format. If it prompts you at boot-up, please proceed to Safe Mode. Loaded driver and processes are minimal so expect that other devices on the computer will not be available during this mode.

SafeMode Networking

Procedure 2: Scan and remove Win32:Downloader-PKU files with MalwareBytes Anti-Malware

To remove Win32:Downloader-PKU, download Malwarebytes Anti-Malware by clicking on the button below. This tool is effective in getting rid of Trojans, viruses and malware.

Download Win32:Downloader-PKU Removel Tool

1. After downloading, please install the program using the default settings.
2. At the end of the installation, please make sure that it will download necessary updates.
3. Once update has completed. The tool will launch.
4. Thoroughly scan the computer and remove all threats detected by this anti-malware program.

Procedure 3: Run TrendMicro's Fake Antivirus Remover (ATTK) to check and delete any remnants of Win32:Downloader-PKU.

As an added help to remove Win32:Downloader-PKU, you can scan the computer with Fake Antivirus Removal Tool. This software is provided and distributed by TrendMicro. Follow this procedure to run a scan with this tool.

1. Download the package by clicking on the button below. This will launch a new browser window that contains further details about the tool.

FakeAVRemover Download Link

2. Save the file to a location on your hard drive.
3. Browse for the location of the file and double-click to run. If you are using Windows Vista or Windows 7, right-click on extracted file attk_far_gui.exe and click on Run as Administrator.

Run FakeAVRemover

4. When program launch, it will run a command prompt to initialize, prepare components, and update the program.
5. Next it will open the graphical user interface (GUI) of Anti-Threat Toolkit.

FakeAVRemover GUI

6. Click on Scan Now. This operation will scan all Win32:Downloader-PKU files and processes in your computer and display a list of result for possible Fake Antivirus program and malware that needs to be removed.

FakeAVRemover Scan

7. Tick all items that are detected by the program, and then click Clean. The tool will start removing Win32:Downloader-PKU components from the computer.
8. If it asked you to restart Windows, please do so.

Procedure 4: Remove Rootkit Trojan with Avast aswMBR

A Trojan often drops malware using an advance technology known as rootkit. It hides the installation of Win32:Downloader-PKU from your anti-virus program and injects malicious code to running Windows processes. To complete the clean-up process, you also need to scan and remove rootkit Trojan.

1. Download aswMBR from Avast server. Save it to your computer.

Avast Rootkit Scanner

2. Double-click on the file aswMBR.exe to run the program.
3. If it prompts you to download the latest Avast! virus definition, please click Yes. This is necessary to identify most recent version of the Trojan as well as hidden files of Win32:Downloader-PKU.

Updating aswMBR

4. Click on Scan button to start checking your computer for presence of rootkit Trojan and other viruses. It will display a message "Scan finished successfully" when done.

aswMBR Scan

5. Click Fix or FixMBR to start removing infection. If aswMBR contains the latest Avast! virus definition file, it will automatically clean infected files on your PC.

Protect your PC from Win32:Downloader-PKU or Similar Attack

Turn On Security Features of your Internet Browser

Internet Explorer - Activate SmartScreen Filter

Internet Explorer versions 8 and 9 has this feature called SmartScreen Filter. It helps detect phishing web sites and protect you from downloading malicious files online. You may have avoided Win32:Downloader-PKU virus if this has been active on your PC.To turn on SmartScreen Filter, follow these steps:

1. Please open Internet Explorer.
2. On top menu, select Tools (IE 9). For IE 8, please look for Safety menu.
3. Select SmartScreen Filter from the drop-down list and click on Turn on SmartScreen Filter.

IE SmartScreen Filter

4. Please restart Internet Explorer.

Google Chrome's Enable Phishing and Malware Protection

With Google Chrome's Phishing and Malware Detection feature, you will have lesser risks browsing the web. It will display a warning when the site you are trying to visit is suspicious. To enable Phishing and Malware Protection, please do these steps:

1. Open Google Chrome.
2. Click on the Customize and control Google Chrome (3-Bars Icon) located on top right corner of the browser.
3. Select Settings from the drop-down list.
4. Once on the settings page, click on Show advanced settings... at the bottom of the page to see the rest of the Chrome setup.
5. Locate Privacy section and mark 'Enable phishing and malware protection'.

Chrome Security Settings

6. Please restart Google Chrome. New settings keep your browser safe while surfing the web.

Mozilla Firefox - Block Attack Sites and Web Forgeries

Phishing and Malware Protection is a built-in feature on Firefox version 3 or later. It warns you when a page you are trying to visit contains phishing content or an attack site designed to drop threats on the computer. To help you keep safe while browsing the Internet using Firefox, please follow this guide:

1. Open Mozilla Firefox browser.
2. On top menu, click on Tools. Then select Options from the list.
3. Select Security and put a check mark on the following items:

  • Warn me when sites try to install add-ons
  • Block reported attack sites
  • Block reported web forgeries

Firefox Security Settings

Remove Win32:Downloader-PKU & Protect Your Computer Now!

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