How to get rid of Ransomware

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Ransomware that can get infected no matter how careful you are. Ransomware is often a problem overseas. It is actually very difficult to completely remove infected ransomware. However, in some cases you can recover your data with minimal ransomware impact. Let's introduce how to do this this time.


Method 1. Use Ransomware analysis tool

There are many different types of ransomware found in the world, and some types may or may not be able to restore files. If your security company has an analysis tool for known ransomware, you can use it to get your files back without paying a ransom.

The existence of analysis tools starts with knowing the type of ransomware. A website called "ID Ransamware" will identify the type of ransomware by submitting a sample file that has been damaged by ransomware. The presence or absence of the unlocking tool is also posted, so if you get infected, please use it. For new ransomware, the unlock tool hasn't come out yet. Let's try a method other than recovery with the unlock tool.


Method 2. Revert Files from backup

If you regularly back up your data to a physical server or cloud storage, you can clean up the infected computer and then recover the data.

First, disconnect the LAN cable from the relevant computer to prevent the damage from the ransomware from spreading. For wireless, turn off Wi-Fi. After disconnecting all connections between your computer and the outside world, refresh your antivirus software's virus definition files and then scan your computer for infected files.

If you find the file, quarantine it, scan your computer, and clean it up. Restore the corrupted file from backup and you're done. At this time, if the backup data also seems to be infected with ransomware, the clean computer will be damaged by ransomware again. Make sure to check the status of the backup file before restoring the file with backup.


Method 3. Use shadow copy

If you can't recover your data using methods 1 and 2, try Shadow Copy. Shadow Copy is a backup system owned by Windows OS that allows you to make copies of corrupted files. If you haven't backed up to another hard disk or cloud storage, back it up in advance.

Shadow copies are stored in the VSS file, but the problem is if the ransomware has deleted the VSS file. Unfortunately, shadow copy cannot be used at this time. Please note that because ransomware has evolved to a high degree, there are many cases where shadow copy does not work.


There is a ransom request screen on your computer ... What would you do?


What do you think you would do if you suddenly see a ransom request screen that you don't remember while using your computer? We conducted a questionnaire to 100 men and women.



Do you take measures against ransomware or ignore them?

・ Ignore the ransom request. And if you can't turn off the screen, return it to the state it was in when you bought your computer. (50s / part-time job / female)

・ If it is a company computer, immediately disconnect the LAN cable and contact your superior and information system department. Then, we will deal with it while receiving instructions. (40s / Permanent Employee / Male)

・ If the ransom request screen suddenly appears on your computer, restore the system. (30s / permanent employee / male)

・ I think you will be surprised. Don't touch it badly until you talk to someone who is familiar with it. (40s / manager / male)

・ I'm surprised, but I ignore it because I think it's ransomware. (40s / Permanent Employee / Female)


Many people who didn't realize that it was a ransomware demand for ransomware seemed to say "ignore". However, some respondents said they would ignore it because it was ransomware, so it was clear that many people did not have detailed knowledge of ransomware.


Isn't it possible to remove ransomware and recover data 100%?


Overseas, there are cases where the decryption key was obtained in response to a ransom request and the in-house data was recovered. However, it does not always give you the decryption key. If you are forced to pay the ransom with company data as a shield, it is not a good idea to pay it easily. Ransom payment is a last resort. It is very difficult to get rid of infected ransomware, and it is very important to take measures at the water's edge to prevent infection and to perform regular backup work in case of infection.

Some ransomware developers have stopped expanding ransomware and released their decryption keys. However, you can think of this as a fairly rare case. Especially in the case of new types of ransomware, it may not be possible to recover and it may be in a state of being overwhelmed. The more data and endpoints your enterprise uses, the more costly and time-consuming it will be to recover. Keeping in mind that your computer will not be infected with ransomware, I always want to be careful when doing business.


summary

There are only two ways to get rid of ransomware that has invaded your computer: pay the ransom to get the decryption key, or wait for the developer to release the decryption key. However, the method is quite uncertain, provided that both are sure to get the key. Keep in mind that ransomware is the best way to prevent it.