Description

Microsoft has disclosed details of a cryptocurrency-focused malware campaign targeting Windows users since February 2026. The operation centers on clipper malware, a threat designed to monitor clipboard activity and manipulate cryptocurrency transactions by replacing copied wallet addresses with attacker-controlled alternatives. Researchers observed that the malware relies on Windows Script Host and ActiveX-based functionality to deploy an embedded Tor client, allowing it to communicate with a hidden command-and-control (C2) server while concealing network activity. In addition to wallet hijacking, the malware is capable of capturing screenshots, stealing sensitive cryptocurrency-related information, and executing attacker-provided code received from the remote server. By combining anonymous Tor communications with remote execution features, the malware extends beyond a traditional stealer and functions as a lightweight backdoor. The infection process begins with a malicious Windows Shortcut (LNK) file distributed through USB storage devices. When executed, the shortcut launches a worm component that first verifies whether the target system has already been infected. If not, it retrieves additional payloads from a remote source. To facilitate propagation, the worm scans connected USB drives for commonly used file formats such as DOC, XLSX, and PDF documents. It then hides the original files and replaces them with deceptive shortcut files carrying the same names, increasing the likelihood that users will unknowingly trigger the malware. The worm also spreads to other removable drives and creates scheduled tasks to maintain persistence across system reboots. After installation, the clipper continuously monitors the clipboard at short intervals to identify wallet addresses, seed phrases, and private keys. It can also upload screenshots through the Tor network and process commands issued by attackers. Microsoft recommends prioritizing behavioral detection techniques, restricting the use of scripting engines such as WScript and CScript, disabling AutoRun for removable media, blocking LNK execution from USB devices, and monitoring clipboard or screen-capture activity on systems handling cryptocurrency transactions.