Cyber Security

What is Cavallososo Ransomware?

Cavallososo ransomware is a type of malware that encrypts all the files on a computer until the user pays a ransom. Files that Cavallososo encrypts will have a .cavallososo extension appended to the end of the file name. The Cavallososo ransomware can create a process in suspended mode, enumerate the file system, query a list of all running processes, and read software policies.

Additionally, it may use reg.exe to modify the Windows registry, and drops files with a non-matching file extension. Cavallososo is delivered through a Win32 EXE file and has been spotted inside the following files and processes: ['lsass.exe', 'svchost.exe', 'f3bcad5358f89df1eb0294ef53f54437.virus']

What is Ransomware?

Ransomware is a type of malicious software that blocks access to a computer system or files on it, then demands a ransom to restore access. The goal is to extort the victim, who is encouraged to pay the ransom through a Bitcoin payment to the attackers.

How Does Ransomware Spread?

Ransomware spreads in a variety of ways. One of the most common ways that ransomware is spread is through phishing emails. The hacker will create a PDF document that looks like a document that the victim is expecting. They will then attach a file that is actually a form of ransomware. Another way is through drive-by downloads. This is when a user visits a website and the page has been infected with ransomware.

Cavallososo Ransomware Capabilities

Cavallososo ransomware is believed to use replication through removable media techniques to move onto disconnected or air-gapped networks systems. The malware is believed to copy itself to removable media and take advantage of Autorun features when the media is inserted into a system and executed. Cavallososo ransomware may also use lateral movement techniques to move onto other systems on the same network. The malware may modify executable files stored on removable media or copy malware and rename it to look like a legitimate file to trick users into executing it on a separate system. 

Cavallososo ransomware may use Remote System Discovery techniques to find other systems on a network that it can then infect. It may also use localhost files to map hostnames to IP addresses. Cavallososo ransomware gathers information about the system, configuration, and installed software from the Windows Registry. This information may help adversaries further their operations within a network. 

The ransomware can also query the registry during automated discovery to shape follow-on behaviours, including whether or not the adversary fully infects the target and/or attempts specific actions. Cavallososo ransomware may use a variety of application layer protocols to communicate with remote systems to avoid detection and network filtering. Commands and results may be embedded in the protocol traffic between the client and server. Cavallososo ransomware may use protocols commonly used for web browsing, transferring files, electronic mail, or DNS.

Mitigations Against Cavallososo Ransomware

There are a few steps that can be taken to help mitigate the risk of Cavallososo ransomware attacks. One is to disable Autorun if it is not necessary. Another is to disallow or restrict removable media at an organizational policy level if it is not required for business operations. Cavallososo ransomware can also be mitigated by using network intrusion detection and prevention systems that use network signatures to identify malware. 1. Utilize Yama to restrict ptrace access to privileged users only. Using security kernel modules that provide advanced access control and process restrictions. Cavallososo ransomware can be mitigated by using network intrusion detection and prevention systems that use network signatures 

How to Remove Ransomware?

No one can guarantee that a computer will not be infected by ransomware. There are, however, some precautions that users can take to minimize the risk of infection. The most important thing is to keep your operating system and installed programs up to date. This will ensure that you have all the latest security patches installed. It is also important to make sure that all your installed programs are from a trusted source. This can be verified by looking for the secure icon on the browser. Finally, make sure that you have a strong password for all your online accounts.

There are a few simple things you can do to protect yourself from ransomware:

  1. Make sure you're backing up your computer, either to the cloud or to an external hard drive. That way, if you do get hit with ransomware, you can just wipe your computer and reinstall your operating system.
  2. Make sure your operating system and all of your software are up to date, so you have the latest security patches.
  3. Don't click on suspicious links or attachments in emails.
  4. Use strong passwords and use different ones for each account you have online.

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