What you need to know about the main ways by which Ransomware Spread
Updated on October 21, 2022, by Xcitium
How Does Ransomware Spread?
Ransomware spreads by exploiting security weaknesses to infect one or more devices before encrypting files or disrupting business operations. Common infection methods include phishing emails, malicious attachments, compromised Remote Desktop Protocol (RDP), software vulnerabilities, infected downloads, stolen credentials, and supply chain attacks. Once inside a network, many ransomware variants attempt to move laterally to other systems and encrypt shared files, servers, and backups.
Common Ways Ransomware Spreads
- Phishing emails with malicious attachments or links.
- Fake software downloads and cracked applications.
- Exploiting unpatched software vulnerabilities.
- Weak or exposed Remote Desktop Protocol (RDP).
- Stolen usernames and passwords.
- Infected USB devices.
- Drive-by downloads from compromised websites.
- Supply chain compromises involving trusted software.
Blocking these attack paths significantly reduces ransomware risk.
Ransomware Spread is a huge problem and what’s really concerning is that it’s actually a very new form of malware. It just seems like it’s been around forever because there is so much of it. The bad news is that ransomware is currently so lucrative that cybercriminals have a huge incentive to create more of it and get it out into the wild. With that in mind, here is what you need to know about the main ways by which ransomware is spread.
Email attachments
Email attachments have long been a common way to spread malware. In general, spreading malware by email is a strategy that is based on quantity rather than quality. The basic idea is that if you send enough emails to enough people you will get enough victims to make it worth your while.
With ransomware spread, however, cyberattackers can go to great lengths to gain a victim’s confidence and then send them a very credible email with an attachment that looks totally legitimate.
The way to deal with this threat is to be realistic about the threat that any email which contains an attachment could, potentially, contain a virus. It doesn’t matter how much you trust the sender, anyone can make a legitimate mistake. This means that all email attachments must be scanned before they are opened no matter what and no matter how urgent someone says it is.
USB devices
Malware existed long before the internet. It used to be spread on storage devices. Then networking began to offer a whole new world of possibilities for malicious actors. Now, however, cybersecurity companies have some excellent tools available to combat all sorts of malware (if people only use them) so using storage devices to spread malware is starting to make a come-back.
USB devices are affordable, easy to use, and can be passed off as legitimate promotional items. They can be made to appear empty (to an average computer user) when they are not or loaded with something which appears harmless. Basically, this last strategy is a variation of sending an email attachment.
The way to deal with the threat of USB infection is to start by limiting access to your USB ports. Then ensure that you only use either brand-new (shrink-wrapped) USB sticks or USB sticks from trusted sources and in the latter case scan them thoroughly before you use them.
Free software
For clarity, there is some great, free software available online. In fact, there is some great, free anti-malware software online. There is, however, also a lot of mediocre free software and some outright malicious free software. Then, bluntly, there is pirated software, which is notorious for being used as a way to spread malware.
The solution to ransomware infection via pirated software is very simple, don’t use it. If you can’t afford the paid version of a product, then do what you can with legitimately free products. They may have less functionality but if you choose the right products, you’ll keep yourself safe. The key to choosing safe free products is to research the developer behind them.
A lot of big-name brands produce free versions of their flagship products. This introduces the brand to people who might not be willing to pay for a product without using it for a while first. It also helps to reduce the temptation to download pirate software, which in turn reduces the motivation to pirate the software in the first place. You can also get safe, free software from smaller, niche, developers, just do your research thoroughly before you download.
Internet surfing
There are all kinds of ways you can be infected with ransomware when you are surfing the internet, but the three most common are short-links, malvertising, and drive-by downloads.
Short-links are very convenient, but they can be used to trick victims into visiting websites they would otherwise have avoided.
Malvertising is the strategy of using paid adverts to spread malware. This typically does not spread ransomware itself. It will usually scan your computer for vulnerabilities that can then be exploited with ransomware.
Drive-by downloads are downloads that happen without the user’s knowledge.
The solution to all of these is a combination of common-sense, education, and a reputable anti-malware program with an integrated firewall.
How Ransomware Spreads Through an Organization
| Attack Stage | Description |
|---|---|
| Initial Access | Attackers gain entry through phishing, vulnerabilities, or stolen credentials |
| Malware Execution | Malicious code begins running on the infected device |
| Credential Theft | Attackers collect usernames, passwords, or tokens |
| Lateral Movement | The ransomware spreads to additional devices and servers |
| File Encryption | Business files and shared storage are encrypted |
| Extortion | Attackers demand payment for a decryption key |
Understanding each stage helps organizations deploy defenses before ransomware reaches critical systems.
Lack of effective data backup processes
Although this doesn’t actually spread ransomware itself, it does encourage the spread of ransomware by encouraging companies to pay the ransom, thus both financing and motivating further attacks.
These days, data backup processes have to be designed to combat the “ricochet effect”, i.e. the possibility that encrypted files will be automatically backed up, overwriting healthy files in the process.
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Common Entry Points for Ransomware
Ransomware commonly enters organizations through:
- Phishing emails
- Malicious email attachments
- Fake software installers
- Exploited operating system vulnerabilities
- Exposed Remote Desktop Protocol (RDP)
- Weak passwords
- Stolen credentials
- Compromised software updates
- Infected removable media
- Drive-by downloads
Securing these entry points is essential for ransomware prevention.
How Ransomware Moves Across a Network
After compromising one device, ransomware may attempt to:
- Access shared folders
- Encrypt network drives
- Spread through Active Directory
- Exploit SMB vulnerabilities
- Use stolen administrator credentials
- Reach backup servers
- Compromise virtual machines
- Target cloud-connected resources
Network segmentation and least-privilege access help limit this movement.
How to Stop Ransomware from Spreading
Steps to Prevent Ransomware Spread
- Enable Multi-Factor Authentication (MFA).
- Keep operating systems and software updated.
- Deploy advanced endpoint protection.
- Segment your network.
- Restrict administrator privileges.
- Disable unnecessary remote access services.
- Back up important data regularly.
- Monitor endpoint activity continuously.
- Train employees to identify phishing attacks.
- Implement Zero Trust security.
Layered security helps stop ransomware before it spreads throughout the environment.
Signs That Ransomware Is Spreading
Watch for:
- Rapid file encryption
- Unusual network traffic
- Unexpected administrator logins
- Multiple devices becoming inaccessible
- High CPU or disk activity
- Security software being disabled
- Ransom notes appearing on several systems
- Unauthorized file modifications
Early detection allows security teams to isolate affected systems quickly.
Immediate Response if Ransomware Starts Spreading
If ransomware activity is detected:
- Disconnect infected devices from the network.
- Isolate additional affected systems.
- Preserve forensic logs and evidence.
- Notify the security or IT team.
- Disable compromised accounts if necessary.
- Remove malware using trusted endpoint security tools.
- Restore systems only from verified clean backups.
- Monitor for recurring malicious activity.
Rapid containment reduces business disruption.
Zero Trust and Ransomware Containment
Zero Trust helps contain ransomware by:
- Verifying every user and device continuously.
- Enforcing least-privilege access.
- Restricting lateral movement.
- Segmenting critical systems.
- Monitoring endpoint behavior.
- Blocking unauthorized access attempts.
Zero Trust reduces the chance that a single compromised endpoint will affect the entire network.
Frequently Asked Questions About Ransomware Spread
How does ransomware spread?
Ransomware spreads through phishing emails, malicious downloads, software vulnerabilities, compromised remote access, infected USB devices, and stolen credentials. It may then move laterally across a network to infect additional systems.
Can ransomware spread across a network?
Yes. Many ransomware families attempt to move laterally using shared folders, administrative credentials, network vulnerabilities, and remote management tools.
What is the most common way ransomware spreads?
Phishing emails remain one of the most common infection methods, followed by unpatched vulnerabilities and compromised Remote Desktop Protocol (RDP) services.
How can businesses stop ransomware from spreading?
Organizations should use advanced endpoint protection, enable Multi-Factor Authentication, segment networks, apply software updates, maintain secure backups, monitor endpoints continuously, and implement Zero Trust security.
Can ransomware spread through cloud storage?
If infected systems have synchronized access to cloud storage or shared cloud resources, ransomware may encrypt synchronized files. Proper access controls, versioning, and backups help reduce this risk.
What should I do if ransomware begins spreading?
Immediately isolate infected devices, disconnect them from the network, notify your security team, preserve evidence, remove the malware using trusted security tools, and restore systems from verified clean backups.
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