The Rise of Information Stealers: The Silent Theft That’s Redefining Cybercrime

While ransomware still grabs the headlines, there’s another threat growing just under the radar. Information stealers have become one of the fastest-expanding forms of cyberattack, and they aren’t loud or flashy. They don’t lock up your files or demand a ransom. They just take and leave.

These malicious programs are designed to quietly collect stored browser credentials, cookies, autofill information, cryptocurrency wallet data, session tokens, and even screenshots. What makes them so dangerous is how fast and quietly they operate. In many cases, by the time a user suspects something’s wrong, the data is already exfiltrated, packaged, and sold on dark web marketplaces.

Dozens of info stealers now operate across the cybercriminal ecosystem. Stealers like Lumma, Raccoon, Vidar, and others are often sold as malware-as-a-service (MaaS), lowering the barrier to entry for threat actors. Even low-sophistication attackers - with little to no technical knowledge - can launch campaigns. They subscribe, configure a few options, and start harvesting credentials within hours. Just as SaaS revolutionised business, MaaS has reshaped cybercrime.

The IBM X-Force Threat Intelligence Index 2025 confirms this trend. It highlights a sharp rise in initial access attacks driven by credential theft - often linked to info stealer infections. These credentials are reused to escalate privileges, move laterally within networks, or sold to other actors looking for a shortcut into organisations. Sectors like finance, education, healthcare, and retail have all been prime targets.

Infection methods remain depressingly effective: fake browser extensions, poisoned Google Ads, Discord and Telegram file drops, phishing attachments - they all still work. And many stealers now come with evasion features, such as delayed execution until after system reboot, or stealth techniques to slip past antivirus solutions.

It’s a threat that often flies under the radar. Unlike ransomware, info stealers don’t throw up alarms or encryption banners. Often, the compromise isn’t detected until credentials are reused for account takeovers, or suspicious activity triggers a cloud platform alert.

This makes education and early detection more important than ever. Users must understand that not all malware announces itself. A fake software update might do more long-term damage than a ransomware splash screen if it grants quiet access to internal systems. Detection tools need to monitor for unusual login patterns and browser credential usage. And incident response plans must account for credential compromise - even in the absence of a full-blown breach.

Information stealers are now part of the standard attacker toolkit. That means they need to be part of the standard defender mindset too.