From Los Angeles County District Attorney:
In the USB Charger Scam, often called “juice jacking,” criminals load malware onto charging stations or cables they leave plugged in at the stations so they may infect the phones and other electronic devices of unsuspecting users.
The malware may lock the device or export data and passwords directly to the scammer.
In addition to the long-warned “don’t plug into USB ports you don’t know” comes “don’t use power cables that you don’t have full control over and know the origin of.”
Link to full story and video.