Infostealers on the rise

Infostealers: Detect compromised devices before they become a breach

Infostealers are among the fastest-growing cyber threats of the decade, quietly siphoning saved passwords, browser cookies, crypto wallets, and session tokens from millions of devices every month. Unlike ransomware, this malware doesn't announce itself.

Start free scan

Book a demo

Trusted by security experts • See results in 2 minutes

Infostealers on the rise

Infostealers: Detect compromised devices before they become a breach

Start free scan

Book a demo

Trusted by security experts • See results in 2 minutes

Infostealers on the rise

Infostealers: Detect compromised devices before they become a breach

Start free scan

Book a demo

Trusted by security experts • See results in 2 minutes

Trusted by the world’s most innovative teams

Trusted by the world’s most innovative teams

Trusted by the world’s most innovative teams

How it works

Detect and act before damage spreads.

Getting started is easy. Three simple steps to detect infostealer activity and know before attackers get in.

Share your domains

Select domains you want Passguard to monitor. No access needed.

We monitor marketplaces

Passguard identifies infected devices with sessions in your systems.

You get alerts

Know exactly which sessions to revoke to stop escalation.

How it works

Detect and act before damage spreads.

Getting started is easy. Three simple steps to detect infostealer activity and know before attackers get in.

Share your domains

Select domains you want Passguard to monitor. No access needed.

We monitor marketplaces

Passguard identifies infected devices with sessions in your systems.

You get alerts

Know exactly which sessions to revoke to stop escalation.

How it works

Detect and act before damage spreads.

Getting started is easy. Three simple steps to detect infostealer activity and know before attackers get in.

Share your domains

Select domains you want Passguard to monitor. No access needed.

We monitor marketplaces

Passguard identifies infected devices with sessions in your systems.

You get alerts

Know exactly which sessions to revoke to stop escalation.

What are Infostealers?

Infostealers are a category of malware purpose-built to extract credentials and session data from a device in seconds. Strains like RedLine, Lumma, Vidar, and StealC scrape saved browser passwords, autofill data, active session cookies, MFA tokens, VPN configurations, and SSO logins, and then ship everything to the attacker. Because session cookies are stolen alongside passwords, attackers can frequently bypass two-factor authentication entirely and log in as the victim from anywhere in the world. A single infected laptop, contractor device, or personal phone with corporate access can hand criminals the keys to your CRM, source code, finance systems, or customer data.

Without a single phishing email being opened by an admin.

Why infostealers slip past standard defenses

Most infostealer infections begin somewhere outside the perimeter your security stack actually watches: a cracked tool installed on a contractor's personal laptop, a fake browser update on a family member's home device, a malicious Google ad, or a poisoned YouTube tutorial. Modern infostealer families rotate code constantly, live only minutes on a device, and exfiltrate data before signature-based defenses can react. Even mature organizations with EDR, MFA, and SSO routinely show up in stealer logs, usually through unmanaged devices, BYOD scenarios, and third-party access. The breach is rarely detected by traditional tooling; it's discovered after credentials are already being resold on dark web marketplaces.

How Passguard helps

Passguard operates from inside the criminal marketplaces and Telegram channels where infostealer logs are traded. The moment a device with credentials or active sessions tied to your domain appears for sale, we surface the compromised device, the exact accounts at risk, and the specific sessions you need to revoke to shut down the attacker's window of opportunity. There are no agents to deploy, no endpoints to instrument, and no integrations to maintain. Passguard works entirely from the outside in, monitoring the same channels the attackers use. Security teams use Passguard to detect infections on managed and unmanaged devices alike, prioritize response, and stop credential theft from turning into a full incident.

What you cover Today

Regular dark web monitoring

Credentials dumps from old breaches like Dropbox and LinkedIn

Corporate laptops with EDR agents

Only your managed endpoints are protected

Suspicious logins flagged by IAM/MFA

Blocked when risk indicators are detected.

What you also cover
with Passguard

Exclusive stealer marketplaces

Real-time trade of infected devices and compromised sessions

Infections on unmanaged devices

BYOD endpoints like personal laptops & contractors remain unprotected

Stolen valid sessions

Hijacked tokens and cookies that bypass MFA and appear legitimate.

Start Free Scan

Monitor

See which accounts are compromised

Infostealer malware silently steals credentials, cookies, and sessions from devices without anyone noticing. Our monitoring shows exactly which employees, devices, and accounts appear in stealer logs, so you know who's infected before the stolen data is used against you.

Learn more

Monitor

See which accounts are compromised

Learn more

Monitor

See which accounts are compromised

Learn more

Reduce risk

Fill in the blind spots

Stealer logs often reveal only a fraction of what was actually stolen; parts stay censored or arrive fragmented. We continuously combine and enrich these sources, so hidden infections become visible and you base decisions on the full picture instead of a random fragment.

Learn more

Reduce risk

Fill in the blind spots

Learn more

Reduce risk

Fill in the blind spots

Learn more

Protect

Prevent account takeover

A single set of stolen credentials or a hijacked session token can escalate into full access to your systems. Because stolen session cookies let attackers bypass passwords and MFA entirely, spotting infections early means you can reset credentials, invalidate active session tokens, and cut off access before an attacker slips in unnoticed.

Learn more