PromqryUI.exe

PromqryUI.exe - "PromqryUI can accurately determine if a modern (Windows 2000 and later) managed Windows system has network interfaces in promiscuous mode. If a system has network interfaces in promiscuous mode, it may indicate the presence of a network sniffer running on the system.

PromqryUI cannot detect standalone sniffers or sniffers running on non-Windows operating systems."

Here's the command line utility: Promqrycmd.exe