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Hi there, I'm new here and looking for some help (I'm not sure if this is the right place, so if it's not please point me where I need to go). The homepage on my Safari has suddenly changed to http://localhost/?"\ and I'm unable to change it back to Google. I'm running macOS High Sierra 10.13.6 on a 2016 MacBook Pro. I've removed WeKnow adware (infected via Chrome) from the same computer months ago but have no other symptoms other than the homepage issue now. I 've had Malwarebytes installed/updated for years now and it's returning zero threats. I only updated my OS three days ago so I'm not sure if it's just an update glitch, but the issue only began appearing today.
As many have found, when installing Malwarebytes on a Mac running High Sierra, I could not install system extensions that enable Real-Time Protection. I do understand it’s not a bug, it’s a feature on Apple’s part. After multiple searches here and elsewhere on the Interweb, no fixes worked for me. No matter how many times I tried to “Allow” in the Security System Preferences nothing would happen. Finally it dawned on me to try “allowing” in Safe Mode. Lo-and-behold, everything is loaded and I have Real-Time Protection switched on. So for the simple home user who is just trying to get a little protection for their Mac without wading into Console or Terminal mode or trying to adjust kernel permissions, here is what worked for me: Turn your Mac off, wait 10 sec (per Apple), then turn it back on while holding down the Shift key. Note: If you usually use a wireless keyboard, use the keyboard on your MacBook/MB Pro or a USB keyboard if you are not on a laptop. Wait for the computer to start up. It will take a longer than usual. Once the desktop is back, it should say “Safe Boot” up in or near the menu bar. Launch Malwarebytes. Try turning on Real-Time Protection. When you get to the point where you are asked to “Allow” system software installation, click “Allow” just like you have every time before. I immediately got another dialog box this time saying Restart was necessary to complete the installation. Restart, again, WITHOUT holding the Shift key. This time I was greeted by a cheerful congratulatory Malwarebytes window saying everything was installed and I had Real-Time Protection as promised with my Premium subscription. Sorry if this fix has already been posted elsewhere, but I never found it on my own searches. And apologies if this doesn’t work for others. I know how frustrating it can be.
After an other success install of the latest MalwareBytes 3.x on Mac OS High Sierra (latest updates, 10.13), I am instructed to click "Allow" in Settings -> Privacy & Security -> General tab. On that screen it says (roughly) "Malwarebytes System Extension has been blocked. Click Allow" and I do, but that does absolutely nothing. I checked the underlying kernel extension database and indeed the com.malwarebytes.rtprotection kernel extension remains blocked sqlite3 /private/var/db/SystemPolicyConfiguration/KextPolicy '.dump kext_policy' CREATE TABLE kext_policy ( team_id TEXT, bundle_id TEXT, allowed BOOLEAN, developer_name TEXT, …); The 3rd field in that table shows as 0 (blocked) for MalwareBytes while 1 (allowed) for all the other extensions already installed. Rebooting does not solve it. Otherwise MWB can run a manual scan. syslog shows no error messages relating to this. There's a lot of (highly charged) discussion about this, e.g.: https://forums.developer.apple.com/thread/79172 but nothing to resolve this particular issue. What to do?