MacOS.Opener.U is a generic Trojan Horse detection that affects systems running macOS. Trojans are a type of malware that use various channels to sneak unnoticed into target devices, perform their malicious agenda, and remain uncovered for as long as needed. They put the user’s online security at enormous risk due to the variety of proposes they can fulfill.
A typical method of the cyber crooks behind MacOS.Opener.U to infect macOS is to hide the malignant scripts into something that looks quite harmless, like an app or a file that promises to improve the performance of a device of the user’s browsing experience. Naive macS users often download and install such suspicious tools from untrusty websites or networks, leading eventually to their system being compromised by malware like this Trojan. In that regard, MacOS.Opener.U may come disguised as a fake software update or an email attachment sent in the course of a spam campaign.
After successful infiltration, Trojans typically aim to provide the attackers with remote control over the compromised computer. That allows them to run many illegal activities without the owner’s consent, like stealing sensitive data and stored login credentials from different apps or websites, monitoring browsing history, or even turning the device into a bot and adding it to a particular botnet. The most dangerous feature of a Trojan, though, is that it can make the device vulnerable to other types of malware, i.e. it can open a backdoor through which the attackers can install additional destructive threats, like Ransomware, for example.
Another common thing among Trojans is their ability to remain uncovered for a long time so that the hackers can exploit their possibilities for extended periods. It is to be expected that MacOS.Opener.U can also achieve that through code obfuscation and other advanced techniques for avoiding detection by anti-malware solutions. Luckily, most reliable anti-virus programs can detect and remove Trojans efficiently, so macOS users who suspect their device has fallen victim to a Trojan infection should download a certified AV-program.