Malicious App 'InstaAgent' Sends Instagram Passwords to Unknown Server, Posts Spam in Users' Feeds
An app developer from Peppersoft downloaded InstaAgent -- full name "Who Viewed Your Profile - InstaAgent" -- and discovered it's reading Instagram account usernames and passwords, sending them via clear text to a remote server - instagram.zunamedia.com.
InstaAgent is also using the credentials to log into accounts and post unauthorized images. Instagram does not permit third-party apps to upload photos to user accounts.
While InstaAgent isn't particularly popular in the United States, it is currently the number one free app in both the United Kingdom and Canada, with thousands of downloads that puts a huge number of Instagram users at risk of having their information stolen. In the Google Play store, the app had between 100k and 500k users, and the install numbers could be similar for iOS.
Google has removed the InstaAgent Android app from the Google Play store, but InstaAgent is still available in the iOS App Store for the time being. Anyone who has downloaded InstaAgent should delete the app immediately and change their Instagram password.
I would say "Who Viewed Your Profile - InstaAgent" is the first malware in the iOS Appstore that is downloaded half a million times.— David L-R (@PeppersoftDev) November 10, 2015
There are dozens if not hundreds of third-party apps that promise to provide Instagram users with followers and other perks, and these kind of apps should be avoided. According to Instagram, these apps are "likely an attempt to use your account in an inappropriate way" as InstaAgent does.
Update 3:20 p.m. Pacific Time: InstaAgent has now been removed from the iOS App Store.