Common Cyber Threats: SQL Injection, DDoS, Phishing, And Ransomware

Intro

You hear about cyber attacks in the news constantly. Data breaches, ransomware, phishing scams. The names are thrown around, but what do they actually mean? How do they work? And what can you do about them?

This article explains the most common cyber threats in plain English — what they are, how they work, how much damage they can do, and what you can do to protect your business.

Phishing

What it is: Phishing is a type of attack where criminals send emails that appear to be from legitimate sources — a bank, a vendor, your CEO — in an attempt to trick recipients into revealing passwords, downloading malware, or transferring money.

How it works: The attacker sends an email that looks real. It might say your account has been compromised and you need to reset your password. The link in the email goes to a fake login page. When you enter your credentials, the attacker captures them. Or the email might have an attachment that installs malware when opened.

Spear phishing is a more targeted version where the attacker researches the victim and crafts a personalized message. Instead of “Dear Customer,” it’s “Hi Sarah, I saw your presentation at the conference last week.”

Business email compromise is a type of phishing where attackers impersonate an executive — often the CEO — and send an urgent request to finance: “I need you to wire $50,000 to this account immediately.”

What it costs: Phishing attacks cost businesses billions annually. A single successful business email compromise can cost $100,000 or more.

How to protect:

• Train employees to recognize phishing emails
• Use email security tools that filter suspicious messages
• Implement MFA so stolen passwords aren’t enough
• Verify unusual requests through a separate channel — call the person to confirm
• Use DMARC, SPF, and DKIM to prevent email spoofing

Ransomware

What it is: Ransomware is malware that encrypts your files and demands payment — usually in cryptocurrency — for the decryption key. Without the key, your data is inaccessible.

How it works: Ransomware typically enters through a phishing email, a malicious download, or an unpatched vulnerability. Once inside, it silently encrypts files on the infected computer and any connected network drives. When encryption is complete, a message appears demanding payment.

Modern ransomware often also steals data before encrypting it, threatening to publish it if the ransom isn’t paid.

What it costs: The average ransom payment is $100,000-500,000. But the total cost — including downtime, recovery, and reputational damage — is typically 3-5x the ransom amount.

How to protect:

• Maintain offline, encrypted backups
• Keep all software updated
• Train employees not to click suspicious links
• Use endpoint detection and response (EDR) tools
• Implement MFA and least-privilege access

SQL Injection

What it is: SQL injection (SQLi) is a type of attack where criminals exploit vulnerabilities in web applications to access or manipulate the underlying database.

How it works: Many websites take user input — search terms, form fields, login credentials — and use it to build database queries. If the input isn’t properly validated, an attacker can insert SQL commands that the database executes. This can allow them to view, modify, or delete data.

A simple example: a login form that builds a query like:

SELECT * FROM users WHERE username='[input]' AND password='[input]'"

If the attacker types ’ OR ‘1’=‘1” as the username, the query becomes “SELECT * FROM users WHERE username=” OR ‘1’=‘1’ AND password=‘anything’” — which returns the first user in the database, often the admin.

What it costs: SQL injection can result in complete data loss, data theft, regulatory fines, and reputational damage. Major breaches involving SQL injection have exposed millions of customer records.

How to protect:

• Use parameterized queries (this is a development best practice that prevents SQL injection)
• Validate and sanitize all user input
• Use a web application firewall (WAF)
• Regularly test applications for vulnerabilities

DDoS (Distributed Denial of Service)

What it is: A DDoS attack overwhelms your website or online services with traffic, making them unavailable to legitimate users.

How it works: Attackers use networks of compromised computers — botnets — to send massive amounts of traffic to your website. The traffic volume exceeds your server’s capacity, and legitimate users can’t access your site.

DDoS attacks vary in size. Small attacks might overwhelm a single server. Large attacks can take down even well-protected enterprise infrastructure.

What it costs: For an e-commerce site, a DDoS attack during peak selling season can cost hundreds of thousands in lost revenue per hour. For any business, it damages reputation and customer trust.

How to protect:

• Use a DDoS protection service like Cloudflare or AWS Shield
• Have scalable infrastructure that can absorb attack traffic
• Monitor traffic patterns to detect attacks early
• Work with your hosting provider on DDoS mitigation

How To Think About These Threats

Not every threat applies to every business equally. A small service business is more likely to be targeted by phishing and ransomware than by a sophisticated DDoS attack. A SaaS company needs to be concerned about all of them.

The key is understanding which threats pose the greatest risk to your specific business and focusing your protection efforts accordingly.

How To Get Started

1. Train your team on phishing. This is the most common entry point for attacks. Well-trained employees are your best defense.

2. Implement MFA everywhere. This protects against credential theft from any source.

3. Back up your data. Ransomware loses its power when you have clean backups.

4. Work with your development team on application security. If you have custom web applications, SQL injection and other application vulnerabilities need to be addressed.

5. Use a DDoS protection service. For most businesses, Cloudflare’s free or low-cost tier provides adequate DDoS protection.

Conclusion

Understanding the threats is the first step in protecting against them. You don’t need to be a security expert to implement the protections that matter most. MFA, backups, employee training, and proper software development practices address the majority of attack vectors.

The threats will continue to evolve. But the fundamentals of protection remain the same. Know the risks. Implement basic protections. Stay vigilant.