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Ransomware spreads through a small number of entry points, and the mix has changed. Verizon’s 2026 breach report found ransomware in 48% of breaches, up from 44% a year earlier. The most common ways in were exploited vulnerabilities (31%), phishing (16%), and stolen credentials (13%).
So this guide covers how ransomware gets in today, what happens after it does, and how to cut the risk at each step. It keeps the classic methods, such as attachments and links, and adds the routes that matter most now.
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How Does Ransomware Spread?
The anatomy of a ransomware attack will involve different stages, which will be followed by the hackers for a potential ransomware attack.
Initial Stage
Attackers who use ransomware attacks on their targets have a motive of gaining access to sensitive data. The starting phase of the ransomware attack is performed in different ways. Attackers convince or trick users into downloading a dropper, which starts the infection, using strategies like social engineering and weaponized websites.
Installing Malware
Once they get access to the system, they will start working on installing malware. So, when the infected file is opened, the malware starts encrypting the files. When the attacker gets access to the system, they start installing malware through which they will get access to the system.
When the attacker gets access, they start working on encrypting files and stealing the data, so that they can get a potential amount from the victim. But do you know if the encryption of the files involves different steps? Let’s check it out.
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Encrypting The Files
Once the attacker installs the malware and starts encrypting the files, the virus probes the local workstation and any network it has gained access to via lateral movement for files to encrypt. These encrypted files can only be decrypted with the key that is given by the attackers.
Contact the Ransomware Attacker
The attacker then gives instructions for contacting them. Never follow them before you have spoken to your incident response team and legal counsel.
Payment
With all the formalities done, comes payday. After paying the ransom, the attackers will provide you with a decryption key. Most of the time, they demand payment in Bitcoin.
Where Ransomware Comes From Today
The four methods below still happen, but they are no longer the whole picture. Four entry routes account for most attacks today.
| Entry route | How it works | What the data says |
|---|---|---|
| Exploited vulnerabilities | Attackers use unpatched, internet-facing systems | 31% of breaches (Verizon, 2026) |
| Phishing | Email, text, or voice leads to a login or a download | 16% of breaches |
| Stolen credentials | Attackers use valid logins from earlier theft | 13% of breaches |
| Prior compromise | Access from an earlier intrusion gets reused | 30% of ransomware operations, double 2024 (Mandiant, 2026) |
The last row changes the picture. Many ransomware attacks do not start with the ransomware crew. An initial access group gets in first and hands the access to a second group. Mandiant found that the median hand-off between the two fell from more than eight hours in 2022 to 22 seconds in 2025.
So a small event, such as one reported phishing email, can be the first sign of an attack about to hand off. Treat low-level alerts as serious until you know otherwise.
How Does Ransomware Spread: Common Infection Methods
Ransomware may be evolving, but it still needs to follow the same guidelines as standard malware, despite its increased sophistication. Some common infection methods ransomware groups use to attack are:
Email Attachments
Ransomware attacks are commonly spread through emails, which encourage the recipient to open malicious attachments. Once the victim clicked on the attachment, ransomware started its work right away. In other cases, the attacker may postpone encrypting the victim’s files for days, weeks, or even months.
Hackers create credible and extremely credible emails, before creating the emails. They do thorough research on their target. The more believable the email is, the more likely victim is willing to open the email attachment.
Prevention Tips:
- Open attachments only from reputable and trusted sources.
- Verify that the email address is valid. Keep in mind that display names and domain names can be spoofed.
- Never enable macros because a message tells you to. Microsoft blocks macros from the internet by default in Office, so a request to turn them on is a strong warning sign. Ask your IT department for advice if you think the attachment is valid.
- Try to avoid spear phishing emails.
Malicious URLs
Malicious links are inserted into emails by attackers to spread ransomware. Newer lures work differently. In a ClickFix attack, a fake error or CAPTCHA page tells the visitor to paste a command to “fix” the problem, and the command installs malware. ESET reported that ClickFix attacks rose more than 500% in the first half of 2025. That made them the second most common attack ESET blocked, after phishing, at nearly 8% of blocked attacks.
The messages are typically written to arouse feelings of intrigue or urgency in order to pursue victims to click on the malicious links. When they click on the link, ransomware starts its work and blocks access to them. They get access after the ransom is paid.
Prevention Tips:
- Be cautious when clicking any links included in emails or direct messages.
- Double-check the links before clicking on them.
- Manually enter the link in the browser to avoid clicking on malicious links.
- Use phishing incident response tool.
Malvertising
The practice of spreading ransomware through malicious advertising, or malvertising is gaining popularity. The same platform and resources that are used to show legitimate ads online are also used by malvertising.
Typically, attackers buy advertising space connected to an exploit kit. The exploit kit scans your system when clicking on the advertisement to gather data on your operating systems and other things. Malvertising plays a significant role in the spread of many ransomware attacks, such as REvil group and Hive ransomware.
Preventing Tips:
- Update your operating systems, programs, and web browsers.
- Unuseful plugins should be disabled.
- Activate an ad blocker.
- Turn on click-to-play plugins in your web browser to stop plugins like Java and Flash from starting up automatically.
Remote Desktop Protocol
Another well-liked ransomware attack is remote desktop protocol, a communication protocol that enables network connections to other computers. RDP typically accepts connection requests via port 3389. Cybercriminals take advantage of this by searching the internet for desktops with exposed ports using port scanners. They then try to access the machine by taking advantage of security flaws or by using brute force attacks to decipher the login information.
After getting access, typically, this entails deleting accessible backups, disabling programs and other security tools, and installing the ransomware. They might leave a backdoor that they can access later.
Prevention Tips:
- To keep your password safe, use strong and different passwords.
- From the default port 3389, change the RDP port.
- Enable RDP only when necessary.
- Apply VPN
- For remote sessions, enable two-factor authentication.
How Does Ransomware Spreads: Prevention
Most victims don’t know what to do if they are facing a ransomware attack. During a ransomware attack, you will have to pay a particular amount to get the data back. However, an organization can take a few steps to prevent ransomware attacks.
Stop Ransomware Spreading
The first thing that you should do is isolate the infected computer to stop the ransomware attack. By isolating the devices, the attackers can not steal more data and demand a higher ransom.
Close the Entry Points
Prevention starts with the routes attackers use most.
- Patch internet-facing systems first. Exploited vulnerabilities were the top way in, at 31% of breaches.
- Use phishing-resistant MFA for email, remote access, and admin accounts, so a stolen password alone does not open the door.
- Watch for leaked credentials. A review of Verizon’s data found that half of ransomware victims had a credential or infostealer event in the 95 days before the attack.
- Limit remote desktop exposure. Keep RDP off the open internet, and require a VPN and MFA.
Identifying The Attack
It is important for the organization or the user to first identify what type of attack and malware it is. Once they analyze it, then your organization can start working on removing the malware or contacting the attackers.
Employee Awareness
Many attacks involve a human decision, so awareness matters. Exploited vulnerabilities and stolen credentials also cause many attacks, so pair training with patching and strong MFA. So, it is important for you to provide your employees with ransomware awareness and simulation.
Fast reporting matters because the hand-off between attackers can take seconds. Threatcop Phishing Incident Response (TPIR) gives staff a one-click way to report a suspicious message from email or WhatsApp. TPIR then runs the message through sandbox analysis, and its “Who Else” insight shows which other mailboxes received it. So the security team can act on the whole campaign, not one inbox.
Multiple Backups of Data
Keep backups offline or immutable, so attackers cannot delete them. Protect backup and admin accounts separately from everyday accounts, and test restores on a schedule. Mandiant found that ransomware groups, including those using Akira and Qilin ransomware, targeted backup systems, identity services, and virtualization management before they encrypted anything. A backup that attackers can reach is not a safe copy.
Final Thoughts
There are numerous ways that ransomware spreads. Phishing, stolen credentials, and exploited vulnerabilities are the main ways in today, and the first two depend on human decisions. No matter how ransomware spreads, you can lower your risk and limit the damage with the steps above.
FAQs: How Ransomware Spreads?
How will I know if my system is infected with ransomware?
There will be a message that the attackers left to contact them. Also, you will notice that your system is working slowly.
How does ransomware work?
Ransomware is malware that is designed to encrypt the files on the computer system and deny access to the owner. Once the system has been encrypted, the attacker will ask for a payment, after which you will have access to the data on the computer.
What to do if the system is infected with ransomware?
Isolate the affected systems from the network. Then call your incident response team and legal counsel, and report the attack to law enforcement. Do not contact the attackers on your own, because they may already hold copies of your data. CISA’s ransomware response checklist lists the steps.
Can hackers steal data through ransomware?
Yes, and often before they encrypt anything. CISA notes that attackers may steal data and then threaten to release it publicly to pressure the victim into paying. So stolen data remains a risk even if you restore from backups.
Should we pay a ransom?
Treat it as a business, legal, and law-enforcement decision, not an IT task. Payment does not undo data theft, because attackers may already hold copies. Ask your incident response team and legal counsel before any contact. Strong, tested backups reduce the pressure to pay.
Senior Writer
Shantanu is an accomplished content strategist and technology enthusiast at Threatcop Inc. With a knack for translating technical intricacies into reader-friendly narratives, Shantanu contributes to making cybersecurity insights both informative and enjoyable for tech enthusiasts and general audiences alike.
