Ransomware is a type of malicious program or malware that can restrict your access to an Internet device or data on it until you pay a ransom in exchange for the ability to access your device or data.
In this article, we will explore how ransomware enters your computer system, how it works, and how to prevent a ransomware attack.
Let’s dive in:
What Is Ransomware Attack?
A ransomware attack is a type of malware attack that limits or prevents you from accessing your device or data until the ransom is paid. What’s worse, malicious actors who carry out ransomware attacks threaten to publish or sell data on the dark web if the ransom is not paid.
According to a Verizon report, ransomware contributes to 10% of all data breaches. These days, one doesn’t have to develop a ransomware kit oneself. Many ransomware operators offer ransomware as a service, allowing threat actors to easily access sophisticated tools and malicious software for targeted attacks.
The following two forms of ransomware are widely used by ransomware perpetrators around the world:
- Locker ransomware that locks your access to a computer system or a mobile device
- Crypto ransomware that encrypts files and sensitive data on a device
How Does Ransomware Work?
Like any other malware, Ransomware can enter your computer device in many ways. But when it comes to modus operandi, all ransomware variants have the following stages in common:
- Ransomware enters your computer device and stays dormant for a few days/months, assessing your critical data.
- Once the ransomware gets access to your critical data, it starts encrypting files with an attacker-controlled encryption key. Ransomware can also delete backup files or encrypt data backup
- After encrypting files or locking your computer system, it will make a ransom demand
There can be a few more additional steps, depending on the ransomware variant. For example, a few ransomware variants exfiltrate data before sending a ransom note.
Though ransomware attackers promise to release a decryption key once the ransom is given, it is not always the case. Also, paying the ransom encourages threat actors to infect other devices. So, making a ransom payment should not be on the top of your list when dealing with a ransomware attack.
Brief History of Ransomware Attacks
The following is a brief history of ransomware attacks:
- Joseph Popp, Ph.D., an AIDS researcher, initiated the first known ransomware attack in 1989 by distributing floppy disks to AIDS researchers
- The first version of CryptoLocker appeared in Dec 2013
- CryptoWall surfaced in 2014, causing around $18 million in damages
- Locky appeared in 2016 and has many variants
- Notorious ransomware WannaCry infected more than 200,000 computers around the globe in 2017
- In 2021, the DarkSide ransomware group attacked Brenntag, pocketing $4.4 million from the company as a ransom
The modern ransomware attacks are sophisticated and demand a big ransom. According to an estimate from Cybersecurity Ventures, global cybercrime costs to grow by 15 percent per year over the next five years, reaching $10.5 trillion annually by 2025.
How to Prevent a Ransomware Infection
Ransomware-infected systems can further infect more devices connected to a network server before you are able to remove ransomware. So, it is imperative to be proactive to block ransomware.
Here are some strategies to prevent ransomware infections:
1. Have Good Network Policies
Be it a home network or enterprise network, you should follow the best network practices to protect from ransomware or any other cyber-attacks.
You should make sure that:
- You install all the software patches and firmware updates timely
- Endpoints are protected
- Employ a multi-layered defense approach to network security
Also, not segmenting your network can spread ransomware from the endpoint to servers. So, ensure that your network is segmented. Doing so can stop ransomware from spreading from one infected system to another.
2. Secure Your Servers
Your hardware and software, including the operating system, should be up to date. And you should never use default passwords for your devices. Always, secure your devices with strong passwords.
If possible, use SSH keys. They are more secure than passwords.
3. Backup Data
Ransomware can encrypt data and files stored on your computer or server. In many cases, ransomware victims don’t get access to encrypted data or encrypted files. So, you should regularly back up all critical data offline and online.
You can easily find reliable cloud storage with an option to encrypt files for added security.
4. Encourage Safe Online Behavior
You and your employees should practice safe online behavior.
You should ensure that your employees:
- Never turn off operating systems’ updates
- Don’t download cracked software
- Avoid clicking on a malicious link
- Don’t open pop-ups on malicious websites
Regularly getting your employees trained in the best cybersecurity practices can help you stay safe from ransomware or other types of malware attacks.
5. Install Security Software
No tool completely stops ransomware. But having ransomware-specific applications can block malicious attachments in phishing emails and keep your valuable files and data safe to a significant extent.
Responding to Ransomware Attacks
If you have a ransomware infected machine, the following step-by-step strategy can help you navigate through the crisis:
Isolate the infected device and lockdown your network in order to stop ransomware from spreading further and encrypting files on other systems.
Assess your damage. And scan your system with a good anti-ransomware tool to get rid of active ransomware executable.
In most countries, authorities recommend not to make ransom payments. But it all depends on your situation.
If you don’t want to pay the ransom, you should consider encrypting data that the threat actor has already encrypted. This can prevent the misuse of data controlled by the threat actor.
Restore the machine from a clean backup or install the operating system again to completely remove malware from your device.
It is not easy to navigate through a ransomware attack. You may not know if you are dealing with a single hacker or a ransomware group.
So, it is better to get professional help to increase the chance of data recovery and complete removal of ransomware.
How Does Ransomware Get on Your Computer?
Spam and phishing emails are the leading cause of ransomware getting on your device. Other reasons for ransomware infection include but are not limited to malicious pop-ups on random websites, pirated software, remote desktop protocol (RDP), USB and removable media, drive-by downloads, and weak passwords.
How Do Ransomware Attackers Get Paid?
Ransomware attackers prefer to get paid in cryptocurrency, especially in Bitcoin. This is due to the nature of cryptocurrency being confidential, anonymous, and hard to trace.
Can Ransomware Spread Through Wi-Fi?
Yes, ransomware can spread through Wi-Fi. Ransomware attacks carried out through Wi-Fi can infect all the devices connected to the network. Wi-Fi can sometimes be an easy way for hackers to spread malicious code and effectuate active ransomware infection.
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