What is Cosd Ransomware

Disasterous virus known as STOP Ransomware, in particular, its latest variation Cosd Ransomware doesn’t loosen up and continues its malicious activity even during the peak of actual human coronavirus pandemic. Hackers release new variations every 3-4 days, and it is still hard to prevent the infection and recover from it. Recent versions have modified extensions, that are added to the end of affected files, now they are: .cosd. Although, there are decryption tools from Emsisoft available for previous versions newest ones are usually not decryptable. The penetration, infection, and encryption processes remain the same: spam malvertising campaigns, peer-to-peer downloads, user’s inattentiveness, and lack of decent protection lead to a severe loss of data after encryption using strong AES-256 algorithms. After finishing its devastating activity Cosd Ransomware leaves the text file – a ransom note, called _readme.txt, from which we can learn, that decryption costs from $490 to $980 and it is impossible without a certain decryption key.

STOP Ransomware (.cosd extensions)

ATTENTION!
Don't worry, you can return all your files!
All your files like pictures, databases, documents and other important are encrypted with strongest encryption and unique key.
The only method of recovering files is to purchase decrypt tool and unique key for you.
This software will decrypt all your encrypted files.
What guarantees you have?
You can send one of your encrypted file from your PC and we decrypt it for free.
But we can decrypt only 1 file for free. File must not contain valuable information.
You can get and look video overview decrypt tool:
hxxps://we.tl/t-ue986XUmqV
Price of private key and decrypt software is $980.
Discount 50% available if you contact us first 72 hours, that's price for you is $490.
Please note that you'll never restore your data without payment.
Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours.
To get this software you need write on our e-mail:
helpmanager@mail.ch
Reserve e-mail address to contact us:
restoremanager@airmail.cc
Your personal ID:
{alphanumeric sequence}

However, this is not completely true. There are numerous techniques and trickery, that helps return some files or even the whole information. In the article below, we explain possible solutions to restore lost files and provide download links for software to remove Cosd Ransomware and decryption tools to decode the data. Unfortunately, those tools work only in case of some malfunction of the virus, but it happens quite often. If Windows system functionality is helpless in your case, we can recommend file-recovery software. The experience shows, that this can be a workaround, that helps to return the information, at least partially. Stellar Data Recovery Professional is one of the best file-recovery tools and, if used properly, may recover copies and duplicates of encrypted files, that were removed prior to infection. The only option for a successful 100% recovery is using existing backups. Follow the guidelines below to remove Cosd Ransomware effectively and decrypt .cosd files for free in Windows 10, 8, 7.

  1. Download Cosd Ransomware Removal Tool
  2. Get decryption tool for .cosd files
  3. Recover encrypted files with Stellar Data Recovery Professional
  4. Restore encrypted files with Windows Previous Versions
  5. Restore files with Shadow Explorer
  6. How to protect from threats like Cosd Ransomware

How Cosd Ransomware infected your PC

Virus modifies “hosts” file to block Windows updates, downloading antivirus programs, and visiting sites related to security news or offering security solutions. Cosd Ransomware comes along with AZORult trojan, which was initially created to steal logins and passwords. The process of infection also looks like installing Windows updates, the malware shows a fake window, that mimics the update process.

fake windows update from Cosd Ransomware

It uses rdpclip.exe to replace a legal Windows file and to launch an attack on a computer network. After encrypting the files, the encrypter is deleted using the delself.bat command file. Cosd Ransomware virus is propagated via spam attack with malicious e-mail attachments and using manual PC hacking. Can be distributed by hacking through an unprotected RDP configuration, fraudulent downloads, exploits, web injections, fake updates, repackaged, and infected installers. The virus assigns a certain ID with the victims, which is used to name those files and supposedly to send a decryption key. Great tools to protect against Cosd Ransomware are: Emsisoft Anti-Malware and Malwarebytes Anti-Malware.

Download Cosd Ransomware Removal Tool

Download Removal Tool

To remove Cosd Ransomware completely, we recommend you to use WiperSoft AntiSpyware from WiperSoft. It detects and removes all files, folders, and registry keys of Cosd Ransomware and prevents future infections by similar viruses.

Alternative Removal Tool

Download SpyHunter 5

To remove Cosd Ransomware completely, we recommend you to use SpyHunter 5 from EnigmaSoft Limited. It detects and removes all files, folders, and registry keys of Cosd Ransomware. The trial version of SpyHunter 5 offers virus scan and 1-time removal for FREE.

How to remove Cosd Ransomware manually

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

Cosd Ransomware files:

_readme.txt
rdpclip.exe
delself.bat
{randomname}.exe

Cosd Ransomware registry keys:

no information

How to decrypt and restore .cosd files

Use automated decryptors

Download STOP Djvu Decryptor from EmsiSoft (.cosd variations)

IMPORTANT: Read this detailed guide on using STOP Djvu Decryptor to avoid file corruption and time wasting.

STOP djvu ransomware decryptor from emsisoft

STOP Djvu Decryptor is able to decrypt .cosd files, encrypted by Cosd Ransomware. This tool was developed by EmsiSoft. It works in automatic mode, but in most cases works only for files encrypted with offline keys. Download it here:

Download STOP Djvu Decryptor

Dr.Web Rescue Pack

Famous antivirus vendor Dr. Web provides free decryption service for the owners of its products: Dr.Web Security Space or Dr.Web Enterprise Security Suite. Other users can ask for help in the decryption of .cosd files by uploading samples to Dr. Web Ransomware Decryption Service. Analysis of files will be performed free of charge and if files are decryptable, all you need to do is purchase a 2-year license of Dr.Web Security Space worth $120 or less. Otherwise, you don’t have to pay.

If you are infected with Cosd Ransomware and removed it from your computer, you can try decrypting 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 Stellar Data Recovery Professional to restore .cosd files

stellar data recovery professional

  1. Download Stellar Data Recovery Professional.
  2. Click Recover Data button.
  3. Select type of files you want to restore and click Next button.
  4. Choose location where you would like to restore files from and click Scan button.
  5. Preview found files, choose ones you will restore and click Recover.
Download Stellar Data Recovery Professional

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 are no 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 Cosd Ransomware, in future

1. Get special anti-ransomware software

Use BitDefender Anti-Ransomware

bitdefender anti-ransomware

Famous antivirus vendor BitDefender released a free tool, that will help you with active anti-ransomware protection, as an 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

idrive backup

As an additional way to save your files, we recommend online backup. Local storages, such as hard drives, SSDs, flash drives, or remote network storages can be instantly infected by the virus once plugged in or connected to. Cosd Ransomware uses some techniques to exploit this. One of the best services and programs for easy automatic online backup is iDrive. It has the most profitable terms and a simple interface. You can read more about iDrive cloud backup and storage here.

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

mailwasher pro

Malicious attachments to spam or phishing e-mails are the 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 MailWasher Pro. It works with various desktop applications and provides a very high level of anti-spam protection.

Download MailWasher Pro

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