What Is Ransomware?
Ransomware is a type of malicious software that encrypts the files on a computer, a server, or an entire network, then demands a ransom payment in exchange for the key to unlock them. Until that demand is met, the files stay unusable — they can't be opened, edited, or copied, and neither can the systems that depend on them, like the point of sale, email, or your invoicing system.
For a business, a ransomware attack isn't just a technical problem. It's a full operational shutdown: you can't invoice, you can't check inventory, you can't serve customers through your normal systems, and if you don't have a reliable backup, the only option left on the table is negotiating with criminals with no guarantee you'll ever get your data back.
How Ransomware Spreads
Ransomware almost never "gets in" on its own — it needs someone inside the organization to open a door without realizing it. The most common entry points are:
- Phishing emails with infected attachments or links that download the malware on click, disguised as invoices, shipping notifications, or a message from a known vendor.
- Poorly secured remote access, such as a remote desktop (RDP) exposed to the internet with weak passwords or no two-factor authentication.
- Unpatched software, where the attacker exploits a known vulnerability that already had a fix available, but nobody installed it.
- Pirated software or downloads from untrusted sources, where the ransomware rides along inside an installer that looks legitimate.
- Infected USB drives or devices plugged into the network without going through antivirus scanning first.
- Lateral movement, where once the attacker has an initial foothold, they use that first infected machine to jump to servers and other devices on the same network.
In most cases documented by cybersecurity firms, the initial entry point is email: it only takes one person on the team opening the wrong attachment for the encryption to start spreading across the network within minutes.
Ransomware Examples You Should Know
There are several families and variants of ransomware, each behaving differently:
- Classic encryption ransomware: locks access to files by encrypting them and demands payment for the decryption key. This is the most common model.
- Double-extortion ransomware: in addition to encrypting the files, the attacker copies them beforehand and threatens to publish them if you don't pay — even if you have backups and can recover the data on your own.
- Ransomware-as-a-Service (RaaS): criminal groups that build the malware and "rent" it out to other attackers for a cut of the ransom, which has multiplied the number of active groups in recent years.
- Scareware or fake antivirus tools: trick the victim into believing their device is infected and pressure them to pay for "cleanup" software that either does nothing or installs additional malware.
Knowing these examples helps make one thing clear: ransomware isn't a single program, it's a complete criminal business model, with different actors and different ways of pressuring a victim into paying.
Ransomware in Mexico: How Real Is the Threat
Mexico shows up consistently among the most targeted countries for ransomware in Latin America, according to reports from cybersecurity firms like Kaspersky and Fortinet, which place it among the region's top targets alongside Brazil and Colombia. Sectors like manufacturing, government, retail, and financial services tend to account for a large share of reported incidents, partly because they handle large volumes of operational data and don't always have dedicated cybersecurity teams.
That doesn't mean only large companies are at risk. Ransomware groups, especially those operating under the ransomware-as-a-service model, attack in an automated, mass-scale way — they scan for any vulnerable network, regardless of company size. A small or mid-size business with a poorly secured server can be just as attractive a target as a large enterprise, because the attacker's cost is low and the operational impact on the victim can be just as severe.
How to Prevent Ransomware With the 3-2-1 Backup Rule
The most effective defense against ransomware isn't only avoiding infection — it's making sure that, if it happens, your business can recover without paying the ransom. That's what the 3-2-1 backup rule is for, a standard widely recommended across the cybersecurity industry:
- 3 copies of your data: the original plus at least two additional backups.
- 2 different media types: for example, a local drive and a cloud storage service, so you're not relying on a single type of technology that could fail or get infected the same way the original did.
- 1 copy off-site: at least one backup that isn't permanently connected to your main network, so a ransomware attack that encrypts everything it can reach can't take that one too.
A backup that's connected to the same network it's supposed to protect, all the time, is in practice just another file ransomware can encrypt. That's why the "1 copy off-site" part — or at least disconnected — is what really makes the difference between recovering your operation in hours versus losing the data entirely.
Beyond backups, preventing ransomware means training your team to spot phishing emails, keeping systems patched, limiting who has remote access to your servers, and enabling two-factor authentication on critical accounts. None of these measures is foolproof on its own; they work as layers that, together, sharply reduce the odds of a successful attack.
Ransomware Response Plan
Having a written response plan, one the team already knows before an incident happens, is what separates a few hours of downtime from a weeks-long crisis. A basic plan includes:
- Isolate infected devices from the network immediately, physically disconnecting them or disabling their access, to stop the encryption before it reaches more servers.
- Determine the scope of the attack: which devices, folders, and systems were affected, and whether the attacker also exfiltrated data before encrypting it.
- Don't treat paying the ransom as the first option: paying doesn't guarantee you'll get a working decryption key, and it directly funds criminal groups to keep attacking other businesses.
- Restore from the off-site backup, verifying first that this backup isn't also compromised before reconnecting it to the network.
- Notify affected parties, including customers or vendors whose data may have been exposed, and assess whether the incident needs to be reported to the relevant authorities.
- Run a post-incident review, to identify how the attacker got in and close that gap before it happens again.
Practicing this plan, even with a simple tabletop exercise once a year, keeps the team from improvising critical decisions in the middle of the stress of a real attack.
Common Mistakes That Open the Door to Ransomware
Some of the most repeated mistakes among companies hit by ransomware are entirely avoidable:
- Relying on backups that have never been tested, only to discover during the attack that the last working copy is months out of date.
- Leaving remote access to servers open to the internet without two-factor authentication.
- Postponing security updates because they "interrupt operations," when in reality they close vulnerabilities attackers already know about.
- Not segmenting the network, so a single infected computer has a clear path to every server in the company.
- Not having a written response plan, which delays critical decisions in the first few hours — the ones that matter most.
Catching these patterns early and fixing them is part of a broader enterprise security strategy, one that combines continuous monitoring with well-designed access controls and backups from the start.
Frequently Asked Questions
What exactly is ransomware?
It's malicious software that encrypts the files on a device or network and demands a ransom payment, usually in cryptocurrency, in exchange for the key to recover them. Without that key, or an independent backup, the affected files stay inaccessible.
Should I pay the ransom if my business gets attacked?
It's not recommended as a first option. Paying doesn't guarantee you'll receive a working decryption key, it draws out recovery time, and it funds criminal groups to keep attacking other businesses. The strongest defense is being able to restore from a clean backup.
How do I know if my business is at risk of ransomware?
Any business connected to the internet is at risk, regardless of size. The risk rises if there are no tested backups, if remote access lacks two-factor authentication, or if systems haven't been patched in a while.
Is antivirus software enough to protect me from ransomware?
Antivirus software helps, but it isn't enough on its own. Real protection combines 3-2-1 backups, up-to-date patching, access controls, phishing awareness training, and an incident response plan.
How does ransomware relate to phishing?
Phishing is one of the most common ways ransomware gets delivered: an email that looks legitimate leads the victim to open an infected file or link, and from there the malware starts encrypting the network.
If your business handles critical information and you want to reduce the risk of a ransomware attack before it happens, at AISDC we design enterprise security strategies that combine threat detection, access controls, and well-structured backups. This topic connects with what we cover in our guide on what cybersecurity is and with the fraud risks we explain in how to validate a SPEI transfer.