MarsStealer

Mars Stealer is a C-based information stealer sold on underground forums since 2021. Successor to Oski Stealer (abandoned after developer arrest in 2020). Targets 40+ browser extensions including MetaMask, Coinbase Wallet, Ledger Live, Atomic, Exodus. Steals: browser passwords/cookies/autofill, screenshots, system info (hardware ID, username, OS), FileZilla/WinSCP credentials, Telegram sessions. Small footprint (~95KB), HTTP POST for exfiltration with base64+XOR encoding. Uses SQLite to parse browser credential stores. Delivered via cracked software downloads, fake Telegram/Discord bots, SEO poisoning. Web panel: SQLite backend, panel sold alongside stealer for ~$140.