Thousands of Mac, iPhone, and iPad users have recently complained about an annoying pop-up prompting them to download a file called f.txt.js. Dropping multiple times while users are browsing the web, the "Do you want to download f.txt.js?" prompt shows nothing but a stubborn determination to make its way to the targeted system no matter what. Is it necessarily a piece of malware, though?
Download link example of F.txt.js file from pop-up - Source: MacSecurity
At first sight, f.txt.js appears to be a misconfigured Google ad rather than a malicious executable. Popular AV solutions do not classify it as outright malware. However, there are two reasons why the f.txt.js pop-up has raised concern. First, it tries to land on a targeted device through the web browser — a trait far more typical of potentially dangerous apps such as browser hijackers, to name a few. Second, most researchers have yet to determine the true nature of that file, as well as its damage potential once installed onto the victim’s PC.
Based on the reasons above, we tend to treat F.txt.js as a potentially dangerous file that primarily affects Mac computers, iPhone devices, and iPad tablets. In this respect, F.txt.js may prompt various unwanted changes or modifications to your device’s OS — including offers you never asked for in the first place. What is more, it may also trigger additional random alerts or notifications aimed at razing your web browsing experience to the ground.
The main actions that may occur from F.txt.js that a Mac computer user may use to identify the threat are the various pop-up alerts that may be rendered, much in a fashion similar to adware threats. The F.txt.js virus may lead to the download of other malware or allow a Mac to become vulnerable to remote attacks if the user unknowingly enables such a connection through the alert messages.
Finally, many other files may have something to do with F.txt.js virus, which a Mac user may not be aware of, leaving their system vulnerable to being compromised in specific ways. Such files may be difficult to detect, which is why experts recommend the use of an antimalware resource to detect and eliminate F.txt.js safely and all associated files to remove the threat altogether.