SlowMist: Udesk Customer Service Script Infected with Malicious Code, Can Steal User Session Data and Replace Deposit Addresses

According to SlowMist, its security personnel discovered during routine threat intelligence monitoring that the Udesk customer service system-related script udeskApi.2026-10-16.cached.js has been implanted with a malicious loader. The loader hides the address using hexadecimal encoding and asynchronously loads the remote script deeps.js (originating from udeskqlobal[.]com; note that the domain starts with the letter 'q'). This script reads page-accessible Cookie, localStorage, and sessionStorage data, intercepts form submissions and login/authentication requests, and sends the data to udeskqlobal[.]com/c.php, enabling attackers to hijack sessions or take over accounts. This data collection behavior is not restricted by target site policies, and unmatched pages may also be affected. According to SlowMist's analysis, the script also targets three categories of sites: mgbx[.]com, bikingex[.], and bitxex[.]io. It scans deposit pages every 200 milliseconds and replaces recognized deposit addresses with preset BTC, EVM, TRON, Solana, LTC, and DOGE addresses. Additionally, by wrapping the Clipboard API, replacing copy buttons, and intercepting copy events, the script ensures users only see and copy tampered addresses. If users transfer funds to these addresses, the assets will flow into the attacker's wallet.