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"Thanks for booking with Expedia! Below is a summary of the trip you recently booked," the e-mail states. "To help ensure everything runs as smoothly as possible, keep this e-mail handy so you can refer to it when you check in as it contains all the essential information you'll need."
The attached ZIP file, according to Hoax-Slayer, contains an .exe file disguised as a PDF. The .exe file installs malware capable of stealing sensitive information from the infected computer and sending it to a remote server.
"If your receive any unsolicited and unexpected email claiming to contain travel booking information, do not open any attachments or click on any links that it contains," Hoax-Slayer advises.