A ransomware attack can shut down a business for weeks, damage reputation with customers and employees, and open the door for further data breaches. As an attack can be devastating, knowing how to prevent ransomware is an essential skill of any cybersecurity team.
This article explains how to prevent ransomware from infecting your business. Read on to learn how to counter the ransomware threat and build a company-wide culture of awareness that stops these dangerous breach attempts.
Ransomware is a type of malware that encrypts or locks the victim’s data. Attackers then demand a ransom in exchange for a unique key to decrypt or unlock the files. Like all malware, a ransomware attack starts when a malicious payload enters the system, which typically happens via:
The most common method of starting a ransomware attack is with a phishing email. The email typically relies on social engineering to encourage the recipient to click a link or download an attachment. If the user falls for the trick, the malware silently installs on the device.
Once the malware is inside the network, the program spreads to connected systems and searches for valuable data. If the program encrypts the data, the victim receives a note that demands payment in cryptocurrency in exchange for the decryption key. Otherwise, attackers threaten to destroy the key or leak sensitive information.
Paying the ransom is typically not the most significant blow for the victim. Monetary losses aside, a ransomware attack can also:
Unfortunately, paying the ransom is not a guarantee for data retrieval. Many victims never receive the decryption key after paying, while some attackers still sell data to the highest bidder after receiving the ransom.
Our article about the most common ransomware types demonstrates both the variety and effectiveness of these cyberattacks.
Ransomware is a danger to both SMBs and enterprises, so companies of all sizes should know how to prevent this cyber threat. Below are the most effective methods of ensuring your business does not fall victim to ransomware.
A firewall is the first software-based line of defense against ransomware. Firewalls scan the incoming and outgoing traffic for potential risks, allowing the security team to monitor for signs of malicious payloads.
To support your firewall activity, consider setting up:
Ideally, your firewall should have the ability to run deep packet inspection (DPI) to examine the data content. This capability automatically identifies packages with infected software.
Read about the different types of firewalls you can set up to protect your business from ransomware and other cyber threats.
An immutable backup operates like any data backup, but it does not allow anyone to change or delete information. This type of backup is the ideal protection against data corruption, whether malicious or accidental. If you fall victim to a ransomware attack, an immutable backup ensures that:
You should back up your data multiple times a day, use at least two backups, and keep one instance offline. If you suffer a ransomware infection, wipe your old system, and recover the last clean backup you have on record.
Remember that losing private customer information to criminals is still an issue even if you can restore the data. Hackers can sell or leak the info, so take time to set up other precautions besides an immutable backup.
Once ransomware enters your system, the malware needs to move laterally through the network to reach target data. Network segmentation prevents intruders from moving freely between systems and devices. Ensure each subsystem in the network has:
If intruders compromise a part of your network, segmentation prevents them from reaching target data. Attackers need time to break into each segment, which gives the security team more time to identify and isolate the threat.
Our introduction to network security explains how companies set up their networks and keep intruders away from sensitive data.
Employees are the most vulnerable attack surface for a ransomware attack. Organize regular security awareness training that explains the role staff plays in preventing ransomware and ensure employees know how to:
Besides covering cybersecurity best practices, staff training should also stress the importance of reporting suspicious activity if something looks off.
Read about spear phishing, a common infection technique hackers use when launching a highly targeted ransomware attack.
Vulnerability assessments enable you to check a systems for weaknesses. These tests inspect the IT environments for potential exploits, such as:
For a more realistic analysis, consider organizing a full-blown pen test. Penetration testing mimics real-life attempts to breach a system, so run occasional ransomware simulations to see how well your system and staff respond to the threat.
Blacklisting and whitelisting are two standard methods for controlling what software employees can install on their devices:
While blacklisting is effective in specific scenarios, whitelisting is a more efficient method of preventing ransomware. Whitelist apps employees can install on their computers to prevent someone from accidentally installing an infected program. You can also whitelist websites for further security control.
Sandboxes are isolated environments that can run programs and execute files without affecting the host device or network. While typically a part of software testing, a sandbox can also help cybersecurity teams test potentially malicious software.
Using a sandbox for malware detection adds another layer of protection against different cyberattack types, including ransomware.
Your staff must know the importance of strong passwords. Unfortunately, average password practices leave a lot of room for improvement:
Remember that ransomware attacks often start by exploiting loose employee behavior. Ensure all employees have strong passwords they update regularly. Otherwise, attackers can breach your system with a simple brute-force attack.
Also, consider using multifactor authentication that requires users and employees to verify identities in multiple ways before accessing a system.
For additional security and control over your staff's credentials, consider deploying a password management solution.
Endpoint security emphasizes the protection of the network’s endpoints, including:
All wireless devices that use your network are a potential entry point for ransomware. Protect these devices from hackers by:
Good endpoint protection also grants admins real-time visibility when an intruder compromises a device, allowing them to react to potential breaches quickly.
Ransomware often exploits security loopholes and bugs within the company’s software, whether for initial infection or lateral movement. Keep software up to date with the latest updates and patches to ensure optimal protection of:
Remember that ransomware evolves like any other malware. Attackers adapt their strategies to the latest vulnerabilities, so even waiting a few days to update a system is a considerable risk.
Email security best practices are crucial to countering phishing and other social engineering traps. Your mail server should:
Technologies you can use to protect your company emails are:
Consider also deploying a third-party email scanning tool for additional protection. This tool helps discover and isolate ransomware attempts before the file reaches the employee.
All your users and employees should only have the level of access they require to perform their roles. A graphic designer in the Marketing team, for example, should not have access to the account details available to the Sales team.
Restricted access limits the damage of a potential ransomware attack. If an intruder compromises one of your employees, the stolen credentials will not allow the attacker to move between systems.
Learn more about zero-trust security, an essential aspect of protecting a complex IT environment.
Ensure all employee devices and browsers have plug-ins and extensions that automatically block pop-up ads. Malicious marketing is a common ransomware source, and blocking ads is a simple way to limit the attack surface.
A common tactic ransomware hackers use is to send .zip files with malicious JavaScript code. Another popular strategy is to pack a .vbs (VBScript) file into a .zip archive.
Prevent this vulnerability by disabling Windows Script Host and remove the devices’ ability to execute scripts.
Ransomware hackers often disguise the malicious payload within a file name such as Paychecks.xlsx, hoping to trick the user into clicking the attachment. If employees set their device to display file extensions, they would see that the file’s real name was Paychecks.xlsx.exe.
Ensuring all employees can see file extensions reduces the chance of accidentally opening a corrupt payload that starts an attack.
If your team uses cloud services, a cloud access security broker (CASB) is an excellent counter to ransomware. A CASB is either an on-prem or cloud-based software that acts as an intermediary between cloud users and data. This tool is essential to cloud security and has multiple purposes, including:
Learn why companies create cloud security policies, official guidelines that instruct employees how to use cloud services correctly.
Unregulated use of employee’s devices poses an unnecessary risk to a network. You can write a BYOD policy that outlines the purposes for which employees can use a private device. Also, ensure employee and guest BYOD devices such as mobile phones have separate Wi-Fis outside the corporate network.
Even top-tier ransomware requires at least a few minutes between infecting a device and connecting with the hacker’s command and control (C&C) server. The security team can set up devices in a way that cuts them off from the network and Internet automatically if a suspicious process takes place.
Without access to the Internet, the ransomware remains idle on an infected device, and the security team can remove the threat without risking other systems.
If your company falls victim to ransomware despite all the precautions, you need a disaster recovery plan. A typical response is to go through the following steps:
Read about cyber kill chains, a security strategy that allows companies to stay one step ahead of cybercriminals.
In most cases, you should not pay the ransom to get your data back. Robust prevention measures and backups should prevent data loss if an attack takes place.
Even if you do not have a data backup, paying the ransom is still a risk. You have no guarantee that you will receive the decryption key, nor that the hacker will not sell the data after you send the payment. Additionally, your willingness to pay will also paint you as a target for future attacks.
Instead of paying the ransom, ensure you are never in a position where the only way to recover from an attack is to meet the criminal’s demands.
A proactive approach to stopping ransomware is the best way to keep your business safe. Implement the suggestions outlined above and create a disaster recovery plan to stay ahead of hackers and avoid needless monetary losses and reputation damage.
Information Blog From : phoenixnap Team.
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