Booknish Jigsaw Virus — How to Remove It and Restore .booknish Files

Booknish Jigsaw Virus — How to Remove It and Restore .booknish Files

The Booknish Jigsaw Virus is the newest strain of the Jigsaw ransomware family. It uses a complex infection algorithm that can cause devastating damage to the infected hosts. Advanced versions of it can induce a Trojan-like behavior that can spy on the users in real time, overtake control of the machines and load additional malware. Read our full removal guide in order to get rid of active infections.

Threat Summary

NameBooknish Jigsaw
TypeRansomware, Cryptovirus
Short DescriptionThe ransomware encrypts sensitive information on your computer system with the .booknish extensions and demands a ransom to be paid to allegedly recover them.
SymptomsThe ransomware will encrypt your files with a strong encryption algorithm.
Distribution MethodSpam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by Booknish Jigsaw

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User ExperienceJoin Our Forum to Discuss Booknish Jigsaw.
Data Recovery ToolWindows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

Booknish Jigsaw Virus – Distribution Ways

This new strain associated with the Jigsaw virus family uses the traditional delivery tactics. Once again one of the most popular means is the use of email messages that utilize social engineering tactics that attempt to manipulate the targets into interacting with the malware elements. The hackers behind the threat can either directly attach the strains to the messages or hyperlink them in body contents. In addition the messages can be used to spread viral payloads, two popular examples are the following:

  • Software Installers — The criminals can embed the dangerous Booknish Jigsaw virus into application installers of various types: system utilities, creativity solutions, production software, office applications and even computer games. The virus infections are deployed automatically once the installers execute correctly.
  • Documents — The virus code can be embedded in documents of different types such as presentations, rich text files and spreadsheets. Usually the infections are done when the malware scripts are invoked. This is done if the victim users enable them.

The other deployment tactic is the use of browser hijackers which are dangerous browser extensions that seek to redirect the victim users to a hacker-controlled site. They are usually uploaded to the official plugin repositories which use fake user reviews, elaborate descriptions and counterfeit developer credentials. The browser plugins are made compatible with the most popular web browsers: Mozilla Firefox, Google Chrome, Safari, Opera, Microsoft Edge and Internet Explorer.

The Booknish Jigsaw virus can also infect legitimate sites as well by using various web scripts. The dangerous files spread by using affiliate and ad networks.

Booknish Jigsaw Virus – In-Depth Analysis

The initial security analysis reveals that the Booknish Jigsaw virus follows the behavior patterns associated with the previous versions that belong to this family of threats. Jigsaw strains are known for having a complex multi-stage infection.

The first part of the attacks are used to prepare the system for the actual ransomware module. This is done by launching a data harvesting engine that can accumulate a large database of data. The collected information can be divided into two main types:

  • Sensitive Private Data — The corresponding malware engines can be configured into harvesting information that can reveal the identity of the victims. Example information includes the user’s name, address, telephone number, geographic location, interests, passwords and account credentials.
  • Campaign Metrics Data — The hackers can instruct the Booknish Jigaw virus engine to extract data that can help optimize the attack campaigns. This includes all manners of operating system details and a detailed review of the installed hardware components.

In some cases the collected information can then be processed by a secondary module known as stealth protection. It is used to prevent certain applications from interrupting the correct virus execution. Examples include anti-virus software, virtual machine hosts or sandbox environments. Some viruses opt to deleete themselves in the event that this step is not successful in order to evade detection.

After this is done the actual malware components of the threat can be started. Administrative access to the operating system is acquired through and then system changes follows. This is usually done to the Windows Registry. The virus sample analysis indicates that the engine manipulates both the strings associated with the operating system and the user-installed applications. This can result in the inability to run certain functions and overall performance issues. Further issues can arise when the virus is instituted as a persistent threat. This means that it will automatically start once the computer is booted. In connection with this the Booknish Jigsaw virus can make it impossible for the users to enter into the recovery menu.

This particular threat also hooks to system services and key Windows components in order to infect the system as deeply as possible. We expect to see Trojan-like behavior by inducing a network connection to a hacker-controlled server. It can be used to gather the collected information hijaked by the Jigsaw malware engine in the beginning of the infection. Such infections are also used to spy on the victims and take over control of the affected machines.

Once all prerequsite conditions have complete the ransomware engine is started. Like previous versions it uses a strong AES cipher in order to affect target user data. The victim files are chosen based on a built-in list of file types. Example data that is compromised includes the following:

  • Archives
  • Documents
  • Backups
  • Databases
  • Images
  • Videos
  • Music

As a result .booknish extension is applied to the victim files. One of the interesting features is that instead of a traditional ransom note an application frame that is created to look like a notification message. It contains the following text:

You have been weened
Your personal files are being deleted. Your photos, videos, documents, etc…
rekt

Every hour I select some of them to delete permanently,
therefore I won’t be able to to access them, either.
During the first 24 hour you will only lose a few files,
the second day a few hundred, the third day a few thousand, and so on.
If you turn off your computer or try to close me, when I start next time
you will get 1000 files deleted as a punishment.

An initial ransomware sum is quoted, at the time of writing the captured strains of the Booknish Jigsaw request the sum of 100 US Dollars.

Remove Booknish Jigsaw Virus and Restore .Booknish Jigsaw Files

If your computer system got infected with the Booknish Jigsaw ransomware virus, you should have a bit of experience in removing malware. You should get rid of this ransomware as quickly as possible before it can have the chance to spread further and infect other computers. You should remove the ransomware and follow the step-by-step instructions guide provided below.

Manually delete Booknish Jigsaw from your computer

Note! Substantial notification about the Booknish Jigsaw threat: Manual removal of Booknish Jigsaw requires interference with system files and registries. Thus, it can cause damage to your PC. Even if your computer skills are not at a professional level, don’t worry. You can do the removal yourself just in 5 minutes, using a malware removal tool.

1. Boot Your PC In Safe Mode to isolate and remove Booknish Jigsaw files and objects
2. Find malicious files created by Booknish Jigsaw on your PC

Automatically remove Booknish Jigsaw by downloading an advanced anti-malware program

1. Remove Booknish Jigsaw with SpyHunter Anti-Malware Tool and back up your data
2. Restore files encrypted by Booknish Jigsaw
Optional: Using Alternative Anti-Malware Tools

Martin Beltov

Martin graduated with a degree in Publishing from Sofia University. As a cyber security enthusiast he enjoys writing about the latest threats and mechanisms of intrusion.

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