We’re pleased to announce that LNK file detection policies have been enhanced in a recent Private Cloud Virus API update.

LNK files are one of many system file types that should be rigorously screened and, in most cases, removed from a file upload or download process. Below, we’ve provided a brief overview of LNK files and the threats they pose to Windows environments.

What are LNK files?

Every operating system uses unique file types to facilitate essential functions. By design, we take these files for granted; they’re abstracted away from our field of view to enhance our user experience. In Windows, shortcut files—officially known as Shell Link Binary Files but more commonly recognized by their .lnk extension—are a great example. These files define a structure, called a shell link, that references a target location in the Windows file system.

In broader terms, LNK files function as shortcuts to launch software, open files, or access folders on a PC. They aren’t the actual file or program; they simply point Windows to the correct program location. The shell link structure contains useful metadata, including a shortcut key, an icon (typically a thumbnail), a description, application settings, and sometimes additional embedded data.

Why are LNK files dangerous?

LNK files can be easily weaponized as a threat vector. They’re particularly attractive to threat actors because they can execute commands silently (i.e., without showing a visible window or alert) and establish persistence, allowing malicious actions to continue even after a system reboot.

Attackers can embed PowerShell commands, VBScripts, or batch files within LNK files to deliver malware into our system. They can also employ the usual set of obfuscation techniques to evade antivirus detection, including disguising LNK files as PDFs, embedding them in email attachments, or hiding them within larger ZIP archives.

Defending against LNK file threats with Cloudmersive

Because LNK files are designed for local shortcuts—not for sharing over networks or being uploaded to file-sharing platforms—they can be categorically removed from risky locations without additional consideration.

Cloudmersive proactively protects against dangerous file types like LNK by inspecting files, archives, and attachments at a deep level. The Cloudmersive Virus Scan API rigorously analyzes file structures to detect and block restricted formats based on strict validation standards.

For more information about LNK file threats or expert advice, feel free to reach out to a member of our team.