How to remove Arena Ransomware and decrypt .arena files

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What is Arena Ransomware

Arena Ransomware belongs to CrySis family, previous wide-spread ransomware of this type was Dharma Ransomware, that we described on this blog. Arena Ransomware was detected by security researches first time in August 2017. Since then, it had numerous updates. This version appends following composite extensions:

.id-{id}.[trump123@cock.li].arena, .id-{id}.[VanDamme@aolonline.top].arena, .id-{id}.[mikecoins@qq.com].arena,.id-{id}.[support@decrypt.ws].arena, .id-{id}.[batmanbitka1@cock.li].arena, .id-{id}.[luckyman@cock.li].arena, .[suppyes@cock.li].arena, .id-{id}.[chivas@aolonline.top].arena, .id-{id}.[m.heisenberg@aol.com].arena, id-{id}.[sindragosa@bigmir.net].arena.

files encrypted with arena

Where {id} is 8-digit alphanumeric identificator. After encryption ransomware creates file FILES ENCRYPTED.txt, that contains following text:

'all your data has been locked us
You want to return?
write email {e-mail address}'

Some versions create INFO.hta file with following message:

All your files have been encrypted!
All your files have been encrypted due to a security problem with your PC. If you want to restore them, write us to the e-mail chivas@aolonline.top
Write this ID in the title of your message [id]
In case of no answer in 24 hours write us to theese e-mails:chivas@aolonline.top
You have to pay for decryption in Bitcoins. The price depends on how fast you write to us. After payment we will send you the decryption tool that will decrypt all your files.
Free decryption as guarantee
Before paying you can send us up to 5 files for free decryption. The total size of files must be less than 10Mb (non archived), and files should not contain valuable information. (databases,backups, large excel sheets, etc.)
How to obtain Bitcoins
The easiest way to buy bitcoins is LocalBitcoins site. You have to register, click 'Buy bitcoins', and select the seller by payment method and price.
https://localbitcoins.com/buy_bitcoins
Also you can find other places to buy Bitcoins and beginners guide here:
http://www.coindesk.com/information/how-can-i-buy-bitcoins/
Attention!
Do not rename encrypted files.
Do not try to decrypt your data using third party software, it may cause permanent data loss.
Decryption of your files with the help of third parties may cause increased price (they add their fee to our) or you can become a victim of a scam.

Different versions of Arena Ransomware demand different ransom amounts. It varies from 0,20 to 0,73 BitCoins, which is near $5000. Security experts do not recommend to pay developers of ransomware, as this encourages them to create new variations and does not guarantee decryption of your files. Actually, most times malefactors don’t send decryption keys. Latest versions of Arena Ransomware are not decryptable, however there is a chance to restore files affected by older versions. Use instructions below to remove Arena Ransomware and decrypt .arena files from Windows 10, Windows 8/8.1, Windows 7.

arena ransomware version 1
arena ransomware version 2

How Arena Ransomware infected your PC

Arena Ransomware spreads via e-mails with malicious attachments with 7z extensions. Those e-mails usually have Status of invoice in subject line. Infection is realized via VBS file, that will then download main executable of Arena Ransomware. Virus assigns certain ID with the victims, that is used to name those files and supposedly to send decryption key. In order to prevent infection with this type of threats in future we recommend you to use SpyHunter and HitmanPro with Cryptoguard.

Download Arena Ransomware Removal Tool

Download Removal Tool

To remove Arena Ransomware completely we recommend you to use SpyHunter from EnigmaSoftware Group LLC. It detects and removes all files, folders and registry keys of Arena Ransomware.

How to remove Arena Ransomware manually

It is not recommended to remove Arena Ransomware manually, for safer solution use Removal Tools instead.

Arena Ransomware files:

Skanda.exe
worm.exe
adobe.exe
README.txt
FILES ENCRYPTED.txt

Arena Ransomware registry keys:


no information

How to decrypt and restore .arena files

Use automated decryptors

kaspersky dharma ransomware decryptor

Use following tool from Kaspersky called Rakhni Decryptor, that can decrypt .dharma files. Download it here:

Download Kaspersky RakhniDecryptor

There is no purpose to pay the ransom, because there is no guarantee you will receive the key, but you will put your bank credentials at risk.

If you are infected with Arena Ransomware and removed it from your computer you can try to decrypt your files. Antivirus vendors and individuals create free decryptors for some crypto-lockers. To attempt to decrypt them manually you can do the following:

Use EaseUS Data Recovery to restore .arena files

  1. Download EaseUS Data Recovery.
  2. Select location to scan for lost files and click Scan button.
  3. Wait until Quick and Deep scans finish.
  4. Preview found files and restore them.

Using Windows Previous Versions option:

  1. Right-click on infected file and choose Properties.
  2. Select Previous Versions tab.
  3. Choose particular version of the file and click Copy.
  4. To restore the selected file and replace the existing one, click on the Restore button.
  5. In case there is no items in the list choose alternative method.

Using Shadow Explorer:

  1. Download Shadow Explorer program.
  2. Run it and you will see screen listing of all the drives and the dates that shadow copy was created.
  3. Select the drive and date that you want to restore from.
  4. Right-click on a folder name and select Export.
  5. In case there is other dates in the list choose alternative method.

If you are using Dropbox:

  1. Login to the DropBox website and go to the folder that contains encrypted files.
  2. Right-click on the encrypted file and select Previous Versions.
  3. Select the version of the file you wish to restore and click on the Restore button.

How to protect computer from viruses like Arena Ransomware in future

1. Get special anti-ransomware software

Use Bitdefender Anti-Ransomware

bitdefender anti-ransomware

Famous antivirus vendor BitDefender released free tool, that will help you with active anti-ransomware protection, as additional shield to your current protection. It will not conflict with bigger security applications. If you are searching complete internet security solution consider upgrading to full version of BitDefender Internet Security 2018.

Download BitDefender Anti-Ransomware

2. Back up your files

onedrive backup

Regardless of success of protection against ransomware threats, you can save your files using simple online backup. Cloud services are quite fast and cheap nowadays. There is more sense using online backup, than creating physical drives, that can get infected and encrypted when connected to PC or get damaged from dropping or hitting. Windows 10 and 8/8.1 users can find pre-installed OneDrive backup solution from Microsoft. It is actually one of the best backup services on the market, and has reasonable pricing plans. Users of earlier versions can get acquainted with it here. Make sure to backup and sync most important files and folders in OneDrive.

3. Do not open spam e-mails and protect your mailbox

spamfighter

Malicious attachments to spam or phishing e-mails is most popular method of ransomware distribution. Using spam filters and creating anti-spam rules is good practice. One of the world leaders in anti-spam protection is SpamFighter. It works with various desktop applications, and provides very high level of anti-spam protection.

Download SPAMFighter

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