What is Katz Stealer?

Katz Stealer is a 2025 Malware-as-a-Service (MaaS) infostealer focused on stealing browser credentials, cookies, and cryptocurrency wallet data.

How does Katz Stealer evade detection?

It uses in-memory execution, steganographic loaders, sandbox checks, and privilege escalation to persist and avoid traditional defenses.

Credentials, cookies, session tokens, autofill data, messaging accounts, VPN/FTP clients, and crypto wallets (desktop and extensions).

Harden email hygiene, monitor PowerShell and cmstp.exe, deploy EDR capable of memory and hollowing detections, and train users against phishing.

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