What is Arkei Stealer?
Arkei Stealer is information-stealing malware for Windows. It searches an infected computer for browser passwords, cookies, autofill data, cryptocurrency wallet files, and other account information. Attackers can use the stolen data to take over accounts, bypass some login checks, or steal digital assets.
Arkei may be delivered through cracked software, fake installers, malicious email attachments, or compromised websites. It usually tries to work quietly, so a victim may notice account activity before noticing a problem on the computer.
Warning signs
- Login alerts, password resets, or MFA prompts that you did not request.
- Unknown browser extensions, startup items, or recently installed programs.
- Sessions from unfamiliar devices or locations.
- Unrecognized cryptocurrency transfers or changes to wallet settings.
- A security scan that identifies Arkei or a related spyware family.
A lack of visible symptoms does not prove the device is safe. Stolen cookies and passwords may remain useful to an attacker after the malware file is removed.
What to do after detection
- Disconnect the affected computer from the network and run a full scan with updated security software.
- Remove detected threats, restart the computer, and scan it again.
- Use a clean device to sign out of active sessions and change passwords for email, financial, work, and social accounts.
- Enable multi-factor authentication wherever it is available.
- Review browser extensions, saved passwords, startup entries, scheduled tasks, and recent downloads.
- Contact financial providers if payment data or account access may have been exposed.
If cryptocurrency wallet data was stored on the computer, create a new wallet on a trusted device and move remaining assets. Do not reuse a seed phrase that may have been exposed.
How to reduce the risk
Install software only from trusted publishers, avoid pirated programs, and verify unexpected downloads before opening them. Keep Windows and browsers updated. Use unique passwords in a password manager, protect important accounts with MFA, and treat unexpected login alerts as an incident that needs prompt review.