Mars Stealer Malware: What You Need To Know?
Online non-custodial wallets are a popular way to store crypto. They’re easy to use and can be connected to different dApps. They give you a lot of freedom in the crypto space. But there are also security risks with wallet extensions like MetaMask, Binance Chain Wallet, and Keplr. Mars Stealer is malware specifically built to steal private keys, wallet addresses, and even 2FA data from non-custodial browser wallets.
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🕒 9:10 PM
📅 Nov 27, 2025
✍️ By chrison2
📍Key Takeaways•Mars Stealer is an evolution of the Oski trojan (2019) and specifically targets private keys, wallet data, and 2FA information from browser extensions.
•The malware is sold cheaply on the dark web, making it easily accessible to cybercriminals worldwide.
•Mars Stealer spreads through phishing emails, malicious websites, and torrents, often disguised as legitimate software or a downloadable .exe file.
•The program performs checks to avoid detection, shuts down on suspicious system settings, and deletes traces to stay hidden.
•Targets include popular wallets and 2FA browser plugins such as MetaMask, Keplr, Binance Chain Wallet, Jaxx Liberty, Coinbase Wallet, and Authy.
📍What is Mars Stealer?
Mars Stealer is malware that steals valuable information from external wallets like MetaMask and Keplr. This includes private keys that give access to all your crypto. The software can be purchased on the dark web for around $140, making it easy for cybercriminals to get their hands on it. For victims, the impact can be huge: if your crypto wallet is infected, you could log in and suddenly see a zero balance. The ultimate nightmare for many HODLers.
📍How does Mars Stealer malware work?
Mars Stealer often looks like legitimate software but typically arrives via a phishing email. Once installed, the malware scans your browser profiles and extensions for wallet data and private keys. This information is then sent to the attacker, who cleans up any traces, leaving you with one clear sign: an empty wallet.
📍How can you protect yourself from Mars Stealer?
The good news is that you have a lot of control over whether you become a victim of Mars Stealer malware. If you want to stay safe with crypto, stick to these basics:
°Only download software from official and legal sources.
°Be cautious of suspicious emails and links you don’t fully trust.
°Avoid torrents and shady downloads on devices where you use wallets.
°Use a hardware wallet for larger amounts. These keep your private keys offline and safe from malware.
°Keep your operating system and browser up to date, and remove extensions you don’t use.
°Regularly check wallet activity and revoke unused permissions.