OhNo! Ransomware

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What is OhNo!?

Discovered by a malware security researcher by the name of Leo, OhNo! is a ransomware-type virus that stealthily infiltrates the system and encrypts various files. While encrypting, this malware appends “OhNo!” extension to the name of each encrypted file. For instance, “sample.jpg” would be renamed to “sample.jpg.OhNo!“. Following successful encryption, OhNo! changes victim’s desktop wallpaper and opens a pop-up window containing a ransom-demanding message.

At the time of research, OhNo! encrypted files stored only in Documents, Downloads, and Desktop folders. Hence, there’s a high credibility that OhNo! is still in development. The ransom-demanding message informs victims about the encryption and states that the files can only be restored with a unique key. Unfortunately, this is true. It is currently unknown what kind of cryptography (symmetric or asymmetric) does OhNo! use. However, in both cases decryption requires a unique key. Cyber criminals (developers of OhNo! ransomware) hide this key in a remote server. For this reason, victims are forced to pay a ransom. Price for the decryption is 2 XMR (Monero cryptocurrency). At this current moment, 1 XMR costs ~$135. Comparing to other ransomware-type viruses (which usually ask for $500-1500 in Bitcoins), the price is relatively small. However, it still should not be paid. Research results show that cyber criminals are likely to ignore victims, once the payment is submitted. These persons should never be trusted. Chances that you will get scammed are high. For this reason, you should never attempt to contact these persons, nor pay any ransom. Unfortunately, as with most of other viruses, OhNo! ransomware is currently undecryptable (there are no tools capable of doing so). For this reason, the only thing victims can do is attempt to restore files/system from a backup.

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Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:

Research revealed dozens of ransomware-type viruses similar to OhNo!. For example, GlobeImposter, X3M, Nemesis, BTCWare, and many other. All listed viruses have identical behavior – they encrypt victim’s files and make ransom demands. As a matter of fact, all file-encrypting viruses have only two major differences – price for the decryption and type of cryptography used. Research also revealed that most of these viruses employ algorithms that generate unique decryption keys (such as RSA, AES, and so on so forth). Hence, unless the ransomware has some bugs/flaws, restoring files without developers’ interference is merely impossible.

How did ransomware infect my computer?

Malware like OhNo! is often distributed using trojans, fake software update tools, exploit kits, spam emails (infectious file attachments), peer-to-peer (P2P) neworks (e.g., torrents, eMule, etc.), and unofficial software download sources (such as freeware download websites, free file hosting websites, third party software download tools, and so on so forth). Fake software updaters are designed to abuse outdated software’s bugs/flaws in order to infiltrate the malware. Spam emails are likely to contain malicious attachments (such as MS Office documents with macros, JavaScript files, etc.) that, once opened, download/install the virus. Peer-to-peer networks and other unofficial software download sources often spread malware by presenting it as legitimate software. Moreover, third party software download tools are likely to download malware alongside with, or either instead of the desired software.

Reimage is a tool to detect malware on your computer. You will need to purchase full version to remove infections.

How to protect yourself from ransomware infections?

Firstly it is worth mentioning that main reasons for computer infections are lack of knowledge and reckless behavior when browsing the Internet. For this reason, users must be very cautious. They should never open any files received from suspicious/unrecognizable email addresses. Furthermore, users should download desired software only from official sources and always (if possible) select the direct download link. If users are forced to use some sort of download tool, they must closely analyze each step (especially “Custom/Advanced” settings) and opt-out all additionally included applications, or even cancel the whole process. It is also extremely important to keep installed applications up-to-date and use legitimate anti-virus/anti-spyware program. The key to computer safety is caution.

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Text presented within OhNo! ransomware’s pop-up:

OhNo! Your have been infected with OhNo! ALL your Documents. Download, and Desktop have been Encrypted with a Unique Key to your System. Each Key is a TOTALLY Random Key specific to that Machine. Please Pay 2. XMR to the specified address below and you based on 100% anonymous transactions. You can find how to purchase Monero by using Google. If you can’t figure our how to Buy XMR, you probably shouldn’t have a PC. – Goodluck

Screenshot of OhNo!’s desktop wallpaper:

Screenshot of files encrypted by OhNo! (“OhNo!” extension):

OhNo! ransomware removal:

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Video showing how to start Windows 7 in “Safe Mode with Networking”:

Windows 8 users: Start Windows 8 is Safe Mode with Networking – Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened “General PC Settings” window, select Advanced startup. Click the “Restart now” button. Your computer will now restart into the “Advanced Startup options menu”. Click the “Troubleshoot” button, and then click the “Advanced options” button. In the advanced option screen, click “Startup settings”. Click the “Restart” button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Video showing how to start Windows 8 in “Safe Mode with Networking”:

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click “Restart” while holding “Shift” button on your keyboard. In the “choose an option” window click on the “Troubleshoot”, next select “Advanced options”. In the advanced options menu select “Startup Settings” and click on the “Restart” button. In the following window you should click the “F5″ button on your keyboard. This will restart your operating system in safe mode with networking.

Video showing how to start Windows 10 in “Safe Mode with Networking”:

Step 2

Log in to the account infected with the OhNo! virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.


Download remover for OhNo! virus
1) Download and install   2) Run system scan   3) Enjoy your clean computer!

Download Removal Toolto remove OhNo

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using “Safe Mode with Command Prompt” and “System Restore”:

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

3. Next, type this line: rstrui.exe and press ENTER.

4. In the opened window, click “Next”.

5. Select one of the available Restore Points and click “Next” (this will restore your computer system to an earlier time and date, prior to the OhNo! ransomware virus infiltrating your PC).

6. In the opened window, click “Yes”.

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining OhNo! ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of OhNo! are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the “Restore” button.

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by OhNo!, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as OhNo! ransomware.

HitmanPro.Alert CryptoGuard – detects encryption of files and neutralises any attempts without need for user-intervention:

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately – before reaching users’ files:

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove OhNo! ransomware:

Download Removal Toolto remove OhNo

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