How to remove Spider Ransomware and decrypt .spider{number} files

What is Spider Ransomware

Spider Ransomware is a malicious program belonging to the MedusaLocker ransomware family, primarily targeting large entities to maximize its extortion potential. This type of ransomware employs sophisticated encryption methods, utilizing RSA and AES cryptographic algorithms to securely lock the victim’s files. Upon infection, it alters the names of the files by appending a distinctive extension, typically in the format .spider{number}, such as 1.jpg.spider1 or 2.png.spider1. This variable numbering system allows the ransomware to identify the version of its attack, which can be tailored for different targets. Following the encryption of files, a ransom note titled How_to_back_files.html is created and strategically placed in several locations across the victim’s system. In the ransom note, the attackers inform the victim of the encryption, the breach of their network, and detail the terms of the ransom payment required to potentially restore access to their critical data. It’s important to note that double-extortion tactics are often employed, threatening the publication of stolen sensitive information to further pressure victims into compliance.

Unfortunately, legitimate decryption tools for files encrypted by Spider Ransomware are not readily available, primarily due to the strength and complexity of the encryption algorithms used. This leaves victims in a challenging situation as data recovery without the attackers’ intervention seems impossible. Despite this, paying the ransom is generally not recommended as it does not guarantee the restoration of data, and encourages criminal activities. Individuals or businesses affected by Spider Ransomware should focus on isolating the infected systems and seek assistance from cybersecurity professionals to mitigate damage and remove the malware. Those fortunate enough to have backups stored securely off-network prior to infection should proceed with removing the ransomware and restoring their files from these backups. Furthermore, keeping systems updated, using reliable security software, and educating users on recognizing and avoiding phishing attempts are crucial steps in preventing future ransomware attacks.

How Spider Ransomware infects computers

Spider Ransomware typically infiltrates computers through deceptive methods, often leveraging phishing and social engineering tactics. Cybercriminals commonly disguise the malware as legitimate files, which are distributed via malicious email attachments, fake software updates, or compromised websites. These files may appear as innocuous documents, executables, or archives, luring unsuspecting users into opening them and triggering the infection chain. Once executed, the ransomware encrypts the victim’s files and demands a ransom for decryption. Additionally, it can spread through network connections, targeting both local networks and connected storage devices. Vigilance and a robust cybersecurity posture are crucial to preventing such infections, emphasizing the importance of user awareness and reliable antivirus software.

1. Download Spider Ransomware Removal Tool
2. Get decryption tool for .spider{number} 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 Spider Ransomware

Spider Ransomware files:


How_to_back_files.html
{randomname}.exe


Spider Ransomware registry keys:

no information

How to decrypt and restore .spider{number} files

Use automated decryptors

Download Kaspersky RakhniDecryptor

Use the following tool from Kaspersky called Rakhni Decryptor, that can decrypt .spider{number} files. Download it here:

Download 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.

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 .spider{number} files by uploading samples to Dr. Web Ransomware Decryption Service. Analyzing 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 Spider Ransomware and removed 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 Stellar Data Recovery Professional to restore .spider{number} files

1. Download Stellar Data Recovery Professional.
2. Click Recover Data button.
3. Select the type of files you want to restore and click Next button.
4. Choose the 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 a 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 are no items in the list, choose an alternative method.

Using Shadow Explorer:

1. Download Shadow Explorer program.
2. Run it, and you will see a 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 an 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 Spider Ransomware, in future

1. Get special anti-ransomware software

Use ZoneAlarm Anti-Ransomware

Famous antivirus brand ZoneAlarm by Check Point released a comprehensive tool, that will help you with active anti-ransomware protection, as an additional shield to your current protection. The tool provides Zero-Day protection against ransomware and allows you to recover files. ZoneAlarm Anti-Ransomware is compatible with all other antiviruses, firewalls, and security software except ZoneAlarm Extreme (already shipped with ZoneAlarm Anti-Ransomware) or Check Point Endpoint products. The killer features of this application are: automatic file recovery, overwrite protection that instantly and automatically recovers any encrypted files, file protection that detects and blocks even unknown encryptors.

Download ZoneAlarm Anti-Ransomware

2. Back up your files

As an additional way to save your files, we recommend online backup. Local storage, such as hard drives, SSDs, flash drives, or remote network storage can be instantly infected by the virus once plugged in or connected to. Spider 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

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