Has my MacBook Air become a MITM target?

Sentinel Pro is a relatively new and still rather unknown player in the anti-virus business. There is absolutely no documentation I can find anywhere that describes what it may be looking for as a MiTM attack. My best guess would be that this is a false positive, but you should probably contact the company directly and see what they have to say.

As for the problem with the lag in the volume change, that is in no possible way related to a MiTM attack, or any other malicious activity. It's impossible to say what might be causing it, but since there appears to be correlation between two completely unrelated things (wifi being on and the lag in volume change), it may be a hardware issue.

Hi Michiel

it is very very very unlikely that you encounter a MITM attack, if you use an encrypted WiFi. The delay might have various reasons. If you switch on your WiFi, your computer starts looking for app updates, it might upload data to your dropbox, check credentials for other cloud services etc etc and so on. This requires quite some resources and thus some other commands (like volume control) might get a lower priority in the process execution. This should have stopped after some seconds, maybe a minute or so - and then everything should be back to normal.

The Antivirus sentinel Pro is generally perceived as worthless, see e.g. Is AntiVirus Sentinel Pro legit? If not, how can I delete it?

And btw: if there's really a MITM attack, you probably wouldn't recognize it at all! https://en.wikipedia.org/wiki/Man-in-the-middle_attack

Regards

MK

MichielRietdijk wrote:

Could the issue be storage related, as I have 40GB left of the 120GB available?

No, that's plenty of free space.

If you like, post the results of an EtreCheck scan, so we can see if you've got any known bad software installed.

http://etrecheck.com

I downloaded AntiVirus Sentinel Pro

Start by getting rid of it. Like all commercial "security" products for the Mac, it's worse than useless and has already wasted your time. Back up all data before making any changes.

After cleaning up that mess, see below.

Launch the Console application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad and start typing the name.

The title of the Console window should be All Messages. If it isn't, select

SYSTEM LOG QUERIES ▹ All Messages

from the log list on the left. If you don't see that list, select

View ▹ Show Log List

from the menu bar at the top of the screen.

Click the Clear Display icon in the toolbar. Then take an action that isn't working the way you expect. Select any lines that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.

The log contains a vast amount of information, almost all of which is irrelevant to solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.

Please don't indiscriminately dump thousands of lines from the log into this discussion.

Please don't post screenshots of log messages—post the text.

Some private information, such as your name or email address, may appear in the log. Anonymize before posting.

When you post the log extract, you might see an error message on the web page: "You have included content in your post that is not permitted," or "The message contains invalid characters." That's a bug in the forum software. Please post the text on Pastebin, then post a link here to the page you created.