You don't have to fall for a phishing email or have one of your favorite websites suffer a data breach to become an identity theft victim. Sometimes, it just takes a piece of malware known as an infostealer to quietly steal your data in the background.
An infostealer is a type of malware specialized in stealing information. These infostealers are sneaky. They seek to stay invisible, unlike forms of malware such as ransomware, that make their presence known to the target by encrypting files and demanding payment. Once installed on a device, infostealers quietly search for valuable data and send it back to attackers without alerting the victim.
Depending on the malware family, an infostealer may collect saved passwords, browser cookies, authentication tokens, email addresses, cryptocurrency wallet information, banking details, browser history, autofill data, and even personal documents.
The stolen information is packaged into what criminals call "logs." These logs are then sold or shared in underground cybercrime communities, where other attackers buy them to launch account takeover attacks, commit identity theft, steal money, or impersonate victims online.
Passwords are getting dethroned as a top coveted good for cybercrooks because attackers have something even more valuable long-term: your browser authentication sessions.
When you sign in to a website, your browser stores session cookies or authentication tokens that indicate you're already logged in. This allows you to continue using the service without entering your password every few minutes.
If an attacker steals that token, they may be able to access your account without your password, and may even bypass multi-factor authentication because your identity was already verified during the original login session.
Infostealers don't necessarily rely on sophisticated hacking techniques. Hackers usually trick targets into installing malware on their devices with common lures, including fake software updates, pirated software, cracked applications, game cheats, malicious browser extensions, phishing emails, fake collaboration offers, and advertisements promoting seemingly legitimate downloads.
Content creators, gamers, freelancers, and small business owners are particularly attractive targets because they often manage multiple online accounts that can be monetized if compromised.
Once installed, the malware begins collecting information almost immediately. Since it rarely causes visible damage, many victims continue using their devices without realizing anything is wrong. What makes these malware infections so dangerous is that even if the infostealer is later removed, the stolen data doesn't disappear. It may continue to circulate in underground marketplaces for weeks or months before another criminal purchases it.
The best way to deal with an infostealer is to stop it before it can collect your information.
A trusted security solution can detect malicious downloads, block phishing websites, identify suspicious behavior, and stop many infostealers before they can take your passwords, browser cookies, or authentication tokens.
Because many people access sensitive accounts from multiple devices, it's important to protect both your computer and your smartphone. Mobile devices increasingly store email accounts, banking apps, authentication apps, passwords, and other personal information that thieves want.
Keeping your operating system and applications updated, downloading software only from trusted sources, and using reputable security software across all your devices can significantly reduce your risk of infection.
Bitdefender Digital Identity Protection continuously monitors your digital footprint and alerts you when your personal information appears in known data breaches or is exposed through infostealer-related leaks.
Instead of wondering whether your information is circulating online, you receive visibility into exposed data associated with your identity, including compromised credentials and other sensitive information that could put your accounts at risk.
If exposure is detected, Bitdefender Digital Identity Protection helps you understand:
Knowing your information has been exposed gives you the opportunity to reset passwords, invalidate active sessions, enable stronger security measures, and reduce the likelihood of identity theft or account takeover.
If your personal information appears in a data breach or a leak related to an infostealer, don't panic. Quick action can significantly reduce the risk of cybercriminals misusing your data.
Remember that changing your password may not always invalidate an existing stolen session. Signing out of all devices forces websites to create new authenticated sessions, making previously stolen session tokens useless.
Infostealers are designed to remain hidden. Even so, warning signs may include unexpected login alerts, unfamiliar browser extensions, missing browser sessions, unusually slow performance, or accounts being accessed from unfamiliar locations.
The safest approach is to run a full scan using a trusted security solution that can detect infostealers. If malware has already stolen your information, Bitdefender Digital Identity Protection can also alert you if your personal information appears in known data breaches or infostealer-related leaks.
Hackers use many techniques to steal personal information, including phishing attacks, malicious websites, fake downloads, software vulnerabilities, and large-scale data breaches.
Infostealers are among the most effective methods because they collect usernames, passwords, browser cookies, session tokens, payment information, and other personal data directly from infected devices. Once stolen, this information may be sold to other cybercriminals, who use it to hijack accounts, commit fraud, or impersonate victims.
Multi-factor authentication is one of the best ways to protect your accounts, but it isn't foolproof. If cybercriminals steal your session tokens or browser cookies after you've logged in, an attacker may be able to access that active session without entering your password or completing MFA again.
This is why protecting your devices from malware is just as important as using strong authentication.
While no security measure can eliminate every risk, you can significantly reduce your chances of infection by combining safe online habits with layered protection.
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