It's called DRAFTING ;)
HACKERS ARE USING GMAIL DRAFTS TO UPDATE THEIR MALWARE AND STEAL DATA
IN HIS CAREER-ENDING extramarital affair that came to light in 2012, General David Petraeus used a stealthy technique to communicate with his lover Paula Broadwell: the pair left messages for each other in the drafts folder of a shared Gmail account. Now hackers have learned the same trick. Only instead of a mistress, they're sharing their love letters with data-stealing malware buried deep on a victim's computer.
https://www.wired.com/2014/10/hackers-using-gmail-drafts-update-malware-steal-data/