Infostealers uncovered: How to protect your data from silent cyber threats

TL;DR Infostealers are stealthy bits of malware designed to steal passwords, financial info, and personal data, without you even noticing. IBM’s 2024 report shows identity theft is now the top method cyber criminals use to break in. This blog breaks down the risks, the stats, and what your business can do to stay protected.

What is an infostealer and why should you care?

Infostealers are one of the fastest-growing cyber threats in the UK. These sneaky programs infiltrate devices, grab sensitive data (think login credentials, credit card info, crypto wallets), and disappear before you even know they were there.

They’re not just a problem for big businesses either. Small and mid-sized businesses are often prime targets because attackers assume your defences are easier to bypass.

Identity theft is now the number one way cyber criminals get in

According to IBM’s 2024 X-Force Threat Intelligence Index, cyber criminals are shifting tactics—and identity theft is their new favourite trick.

• Valid account abuse rose by 71% year-on-year, now making up 30% of initial attack entry points.
• Credential-based breaches require 190% more effort to clean up than the average incident.
• Data theft now accounts for 32% of all cybercrime impacts, overtaking extortion.
• Infostealer malware surged 266% in activity.
• Security misconfigurations accounted for 30% of web app vulnerabilities.

Michelle Alvarez, strategic threat analysis manager at IBM, put it clearly:

“We expected credentials to be a top-three access vector—but the 71% rise and tie with phishing was a shock.”

How do infostealers work?

Infostealers are designed to blend in and quietly exfiltrate data from devices. Once installed (usually via a malicious download or dodgy ad), they can:

• Collect usernames, passwords, and tokens
• Steal credit card info and crypto wallets
• Grab personal info stored in your browser or apps
• Record keystrokes, take screenshots, and even install more malware

The stolen data often ends up for sale on criminal marketplaces like the infamous “Russian Market”—sold cheap and used for further attacks like ransomware.

The hidden costs of infostealer attacks

Beyond the immediate data loss, infostealers can have a long-term impact:

• Longer recovery times: Credential breaches take 190% more effort to fix.
• Financial losses: Hackers use stolen data to drain accounts or escalate attacks.
• Reputational damage: Clients lose trust when their information is leaked.

6 ways to protect your business from infostealers

The good news? There’s a lot you can do to keep your business safe.

1. Avoid suspicious downloads and ads

That “free” tool or browser extension might come with malware baked in. Stick to verified sources only.

2. Keep all devices and apps updated

Software updates fix vulnerabilities. Delaying them gives infostealers a window of opportunity.

3. Use multi-factor authentication (MFA)

Even if your password gets stolen, MFA can stop criminals from logging in.

4. Install reputable antivirus software

A quality endpoint security solution will flag and block suspicious activity early.

5. Train your team regularly

Cyber awareness training helps people recognise risky behaviour, especially phishing emails and fake login pages. Find out more about our cyber training services.

6. Monitor network activity

Watch for unexpected spikes in traffic or strange logins. These could be signs something’s slipped through the cracks.

Act now before infostealers act for you

Infostealers are only getting smarter. If you wait until after a breach, the damage (and cost) is often far worse.

At Cloud & More, we specialise in cyber security for businesses that just need IT to work. From audits and monitoring to training and advanced protection, we help businesses like yours stay one step ahead.

Want to keep infostealers out? Let’s talk.

Book a 20-minute discovery call and we’ll walk you through the essentials no faff, no fluff.

FAQs: Infostealers and how to stop them

1. What is an infostealer?

A type of malware designed to steal sensitive data like login credentials, financial information, and browser-stored details, without triggering alarms.

2. How do infostealers get onto a device?

• Malicious email attachments
• Fake apps or games
• Suspicious ads and pop-ups
• Phishing websites

3. Why are small businesses a target?

Criminals often assume smaller businesses don’t have strong cyber security in place. They still hold valuable data, making them easy, profitable targets.

4. What are signs of an infostealer infection?

• Random logins to your accounts
• Unexplained financial activity
• Sluggish performance or odd device behaviour
• Security warnings from your antivirus software

5. What should I do if I think I’m infected?

• Disconnect the device from the internet
• Run a full antivirus scan
• Change your passwords
• Get expert help (like us!)

6. Can infostealers lead to bigger attacks?

Yes. They often open the door for ransomware or business email compromise (BEC) by handing over your login details to attackers.

7. How does MFA help?

MFA requires extra proof to log in like a code sent to your phone. Even if someone steals your password, they can’t get in without the second factor.

8. Is it expensive to protect against infostealers?

Not necessarily. Essential defences include:

• Antivirus software
• MFA
• Staff training
• Keeping software up to date

Cloud & More offers packages tailored for growing businesses that need great protection without the corporate price tag.

9. What’s the best way to prevent an infostealer attack?

• Train your team
• Keep everything updated
• Use layered security tools
• Monitor for red flags

10. Where can I get help?

Right here. At Cloud & More, we offer proactive, people-first cyber security that actually works. Get in touch to protect your business from silent threats like infostealers.