Karo ransomware virus. How to remove? (Uninstall guide)

removal by Jake Doevan - - | Type: Ransomware
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Karo ransomware infects the system to take your files hostage

Karo virus

Karo ransomware is a data-encrypting computer virus[1] that emerged in the end of June 2017. It targets vulnerable computer systems that have no security software installed on them. The ransomware encrypts data and marks corrupted files with .ipygh file extensions. Then it drops a ransom note with a banal title ReadMe.html.

The virus will encrypt files with an AES-256 encryption algorithm [2], rendering them unreadable and appends .ipygh extensions to indicate which particular files have been affected. The destructive encryption may be applied to a variety of documents on mounted hard drives, external storage drives as well as open network shares.

Extortionists communicate with the victims via Tor network.

Ransomware infection is a serious computer security infringement. Naturally, it has a significant impact on the system’s performance. This means that if you recognize your computer quite well, you may be able to grasp the ransomware at the initial states of its infiltration.

Monitor your system’s performance speed, CPU and RAM utilization. If these indicators show unusual activity while no visible programs are running in the system, you should not ignore it. Take some time to scan your PC for potential ransomware infection and remove Karo if it is found hiding on your system.

Experts do not recommend[3] tackling the virus manually. The virus is way too complicated to be eliminated without the assistance of specialized software. That’s why experts recommend employing Reimage, Malwarebytes Anti Malware or similar utilities to perform Karo removal for you.

Alleged connections to Petya

Since this virus has emerged in the middle of Petya/NotPetya ransomware campaign upheaval, some tend to ascribe it to this particular virus family. Nevertheless, the relationship between the two was denied – it turned out that unexpectedly emerged Karo was simply confused with the new Petya virus.

It appears that Karo's downloader hashes were found in a GitHub repository for Petya-related IOCs. It was yet another detail that led to the confusion of these two viruses. However, now it is clear that viruses are not related and created by different cyber crime gangs.

The main Karo ransomware attack vector

Karo ransomware is mainly promoted via malicious spam. The attackers use victim's name in the email subject. They pretend to be someone from a well-known business company and falsely inform the victim about a sum that they're about to charge from victim's bank account. The crooks state a sum that is not unrealistic, but also quite large as well.

The deceptive message then informs the victim to check an attached password-protected document associated with the payment. The document contains a macro function that, once activated, launched cmd.exe and downloads the ransomware to the system.

This social engineering scheme is extremely effective and it helps to convince users install ransomware on their computers without realizing it. For this reason, you should never interact with files or programs sent to you by unknown people.

Prevent ransomware attack with these easy tips

Karo distribution is currently rather low. If you have not been infected with the malware yet, you should use this for your own benefit – strengthen your system’s security! You can make your system a lot more safe in just four steps:

  • Upgrade your system to the latest version. Don’t use outdated OS versions as they don’t receive security patches and are often more vulnerable to different malware infections.
  • Keep your antivirus software and other installed programs updated. Programs that don’t receive security patches may have zero-day vulnerabilities that could be easily exploited to drop malware on your computer.
  • Be careful while browsing through your email. Malware may arrive at your PC in spam emails as an attached invoice, speeding ticket or some other document. These files may hide Karo ransomware dropper file which will be activated once opened.
  • Refrain from browsing on poor reputation websites and stay away from unsafe peer-to-peer networks. Ransomware tend to circle around in such places and can be well disguised as legitimate programs.

Get rid of Karo ransomware virus

Trying to remove Karo virus from the infected device can be risky and may result in total data corruption as well as the entire operating system. All it takes is a single mistake while eliminating one of its malicious files from the PC. Luckily, mistakes can be prevented by putting professional anti-malware software to work.

Just launch some reliable malware removal tool on your PC and let it take care of all the dirty work. After the security software is done with the system scan, there should be no malicious components left on your computer and Karo removal should be complete.

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What to do if failed?
If you failed to remove infection using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to uninstall Karo ransomware virus. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.

More information about this program can be found in Reimage review.

More information about this program can be found in Reimage review.

Manual Karo virus Removal Guide:

Remove Karo using Safe Mode with Networking

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

Karo ransomware may block your security utility from running system scans in order to prevent its elimination from the system. Nevertheless, the virus can be decontaminated. You only need to boot your PC in Safe Mode and then run the system scan again.

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove Karo

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete Karo removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove Karo using System Restore

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

One more technique which may unblock you antivirus is presented below:

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of Karo. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that Karo removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove Karo from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by 2-spyware.com security experts.

If your files are encrypted by Karo, you can use several methods to restore them:

Make use of Data Recovery Pro

Here are a few simple steps which will explain how to use Data Recovery Pro for the restoration of the encrypted data.

How to use Windows Previous Versions feature?

This is a question that users often ask us. Thus, we've prepared a brief tutorial below to guide you through the process.

  • Find an encrypted file you need to restore and right-click on it;
  • Select “Properties” and go to “Previous versions” tab;
  • Here, check each of available copies of the file in “Folder versions”. You should select the version you want to recover and click “Restore”.

Shadow Explorer as data recovery option

According to the preliminary findings, Karo virus does not seem to be destroying Volume Shadow Copies of the encrypted files. If these findings are true, you should be able to recover your files using Shadow Explorer like explained below

  • Download Shadow Explorer (http://shadowexplorer.com/);
  • Follow a Shadow Explorer Setup Wizard and install this application on your computer;
  • Launch the program and go through the drop down menu on the top left corner to select the disk of your encrypted data. Check what folders are there;
  • Right-click on the folder you want to restore and select “Export”. You can also select where you want it to be stored.

Currently, Karo decryptor is unavailable

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Karo and other ransomwares, use a reputable anti-spyware, such as Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus or Malwarebytes Anti Malware

About the author

Jake Doevan
Jake Doevan - Computer technology expert

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References