The Casseto virus is a new ransomware threat that encrypts target user data with a strong cipher called and renames them with the .cassetto extension. At the moment the acquired samples indicate that this may be a test release. Our article provides an overview of the virus operations and it also may be helpful in attempting to remove the virus.
|Short Description||The ransomware encrypts sensitive information on your computer system with the .cassetto extension and demands a ransom to be paid to allegedly recover them.|
|Symptoms||The ransomware will encrypt your files with a strong encryption algorithm.|
|Distribution Method||Spam Emails, Email Attachments|
|Detection Tool|| See If Your System Has Been Affected by Casseto virus |
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|User Experience||Join Our Forum to Discuss Casseto virus.|
|Data Recovery Tool||Windows 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.|
Cassetto Virus – Distribution Ways
The Casseto virus is a ransomware strain that has been spotted in a limited distribution release. The acquired samples do not seem to target specific countries and due to the low number of captured virus code the security analysts were not able to state the which delivery method is the preferred one. We anticipate that in future attacks several methods may be used at once. In the meantime any one of the popular tactics can deliver a Casseto virus infection.
The first and most prominent way is to coordinate the construction of an email SPAM campaign. They use various social engineering tactics to coerce the users into interacting with the malicious content. The virus file itself can be delivered directly as a file attachment or linked in the body contents.
Another mechanism is the creation of numerous fake download sites that use a familiar design layout that imitates popular web portals that users typically use. These two methods are also the main ones responsible for distributing payload carriers. The two most popular forms are the following:
- Documents — The Casseto virus code can be embedded in scripts that are inserted in documents of various types: rich text documents, spreadsheets, presentations or databases. Once they are opened by the victim users a notification prompt will appear asking them to enable the built-in macros. If this is done the virus infection will follow.
- Infected Software — The threat can be embedded in software installers, plugins or updates. The most common way this is done is by taking the legitimate files from the vendors sites and modifying them with the relevant code. As a result whenever they install such an app the virus will be delivered automatically.
Other tactics include the upload of the infected files on file sharing networks like BitTorrent where pirate content is usually found. Links can be spread also on community forums and web sites. The criminals can also make use of scripts to subvert the sites and messages to the virus download action.
Advanced infection campaigns can make use of browser hijackers, also called redirects. They represent malicious plugins made for the most popular web browsers. They are spread on the official extension repositories and third-party sites making use of elaborate descriptions, fake user reviews and developer credentials. Once installed they will modify the installed browser settings to redirect the victims to a hacker-controlled page. Following this the dangerous payload will be downloaded from a remote server and executed on the local machine.
Cassetto Virus – In-Depth Analysis
The captured strains associated with the Casseto virus have been acquired during a test release campaign. The initial security analysis shows that the main engine does not contain any code taken from the famous ransomware families. This leads us to believe that it may be possible that the hacker or criminal collective behind it may be the original authors. The other hypothesis is that the controllers have bought the ransomware code from an underground marketplace or have paid other hackers to produce a custom version for a particular goal. Whatever the reason the Casseto virus will follow the prescribed behavior as instructed by the hacker operators.
A typical infection will begin with a data harvesting module. The extracted information is classified into two main categories. The engine can extract information that can expose the victim’s identity. The strings that are extracted can include their name, address, phone number, interests, location and account credentials. Other information that is typically acquired includes campaign optimization metrics. It is used to optimize the attacks by acquiring information such as the installed hardware components, certain user settings and operating system variables.
This information can then be used to bypass any installed security services — anti-virus products, sandbox environments and virtual machine hosts. The associated real-time engines can be bypassed or entirely removed. This will allow the engine of the Casseto virus to continue with various system modifications. They can be different depending upon the integrated instructions.
One of the first actions executed by most viruses is the Windows Registry changes. The engine of the Casseto virus can modify existing strings belonging to the operating system or user-installed applications. The consequences include severe performance issues when using the computer and the inability to access certain functions or services. Strings can be created for the virus itself. When this is combined with modifications of boot settings this can lead to a persistent installation. When this feature is active it will automatically start every time the computer is powered on and will disable access to the recovery boot menu. This will render most manual removal instructions useless. Additional measures that make it more difficult to restore the computer is to delete Restore Data — this includes all identified Restore Points and Shadow Volume Copies information.
In certain cases ransomware threats like the Casseto virus are configured to deploy additional threats such as Trojans. Their route of behavior is to establish a secure connection with a hacker-controlled server. It allows the criminals to spy on the victim machines in real-time, hijack files and install other viruses.
Cassetto Virus — Encryption
Once all components have completed operation the ransomware engine will be called. Like other popular threats it will make use of a built-in list targeting the most popular file types. They will be encrypted with a strong cipher and processed further if instructed. An example list may contain the following data:
All victim files will be renamed with the .cassetto extension. The associated ransomware note is called “IMPORTANT ABOUT DECRYPT.txt” and reads the following:
WARNING!! YOU ARE SO F*UCKED!!!
Your Files Has Encrypted
What happened to your files?
All of your files were protected by a strong encryptation
There is no way to decrypt your files without the key.
If your files not important for you just reinstall your system.
If your files is important just email us to discuss the the price and how to decrypt your files.
You can email us to email@example.com
We accept just BITCOIN if you don´t know what it is just google it.
We will give instructions where and how you buy bitcoin in your country.
Price depends on how important your files and network is.
It could be 0.5 bitcoin to 25 bitcoin.
You can send us a encrypted file for decryption.
Fell free to email us with your country, computer name and username of the infected system.
Remove Casseto Virus and Restore Encrypted Files
If your computer system got infected with the Casseto 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.