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What is "AppMH" and why does it use up all of my memory?

I always have the activitymonitor on and since a week or so there's this application called "AppMH" that keeps popping up. And when it does, it instantly uses up all of my Mac's memory and my swap. I only notice after a while sometimes and one it used up like 30GB of my swap.

The problem is that i can't find it on my computer anywhere. The only thing I can do is stop the app in Activitymonitor, but it keeps coming back.

Anyone that knows what this is and how to get rid of it?


Robin

iMac, OS X Yosemite (10.10.1)

Posted on Nov 16, 2015 2:52 PM

Reply
Question marked as Best reply

Posted on Nov 16, 2015 5:29 PM

Don't use any kind of "anti-virus" or "anti-malware" product on a Mac. There is never a need for it, and relying on it for protection makes you more vulnerable to attack, not less.

You installed one or more variants of the "InstallMac" trojan. Take the steps below to disable it.

The criminal behind this attack tries to make the malware hard to remove by varying the names of the files it installs. This procedure works as of now, as far as I know. It may not work in the future. Anyone finding this comment a few days or more after it was posted should look for a more recent discussion, or start a new one.

Back up all data before continuing.

1. Triple-click the line below on this page to select it, then copy the text to the Clipboard by pressing the key combination command-C:

~/Library/LaunchAgents

In the Finder, select

Go Go to Folder...

from the menu bar and paste into the box that opens by pressing command-V. You may not see what you pasted because a line break is included. Press return. A folder named "LaunchAgents" will open.

2. Inside the folder you just opened, there may be files with a name of the form

something.AppRemoval.plist

something.download.plist

something.ltvbit.plist

something.update.plist

where something is usually a meaningless string, such as any of the following:

Epolife

InstallMac

Javeview

Kuklorest

Manroling

Otwexplain

These are examples, not a complete list. The string could be anything. The point is that the same string will usually appear in the name of three or four files.

You could have more than one copy of the malware, with different values of something.

Move all such items to the Trash. If there are any other files with a name that begin with something, move them to the Trash also. After you've done that, there may not be anything left in the LaunchAgents folder; in that case, you can delete the folder, but otherwise don't delete it. Other files in the folder are not necessarily malicious (though they could be, if you also installed some other kind of malware.)

Log out or restart the computer. The trojan will now be inactive, but there are a few more components of it that should be cleaned up.

3. Open this folder in the same way as above:

~/Library/Application Support

and move to the Trash any subfolders named with the same something you found in Step 2.

Don't move the Application Support folder or anything else inside it.

4. Open the Applications folder. If there is an item with the same name as in Step 3, or any of the other names listed in Step 2, or with the name "Zip Devil," drag it to the Trash.

If in doubt, press the key combination option-command-4 to arrange the apps by date added. Look at the apps that have been added since you first noticed the problem. If there is one you don't recognize, drag it to the Trash.

Empty the Trash.

If you get an alert that the application is in use, force it to quit.

5. From the Safari menu bar, select

Safari Preferences... Extensions

Uninstall all extensions you don't know you need. If in doubt, remove all of them. None is required for normal operation. Do the equivalent in the Chrome and Firefox browsers, if you use either of those.

6. Reset the home page in each of your browsers, if it was changed. In Safari, first load the home page you want, then select

Safari Preferences... General

and click

Set to Current Page

6 replies
Question marked as Best reply

Nov 16, 2015 5:29 PM in response to Robin-Enea

Don't use any kind of "anti-virus" or "anti-malware" product on a Mac. There is never a need for it, and relying on it for protection makes you more vulnerable to attack, not less.

You installed one or more variants of the "InstallMac" trojan. Take the steps below to disable it.

The criminal behind this attack tries to make the malware hard to remove by varying the names of the files it installs. This procedure works as of now, as far as I know. It may not work in the future. Anyone finding this comment a few days or more after it was posted should look for a more recent discussion, or start a new one.

Back up all data before continuing.

1. Triple-click the line below on this page to select it, then copy the text to the Clipboard by pressing the key combination command-C:

~/Library/LaunchAgents

In the Finder, select

Go Go to Folder...

from the menu bar and paste into the box that opens by pressing command-V. You may not see what you pasted because a line break is included. Press return. A folder named "LaunchAgents" will open.

2. Inside the folder you just opened, there may be files with a name of the form

something.AppRemoval.plist

something.download.plist

something.ltvbit.plist

something.update.plist

where something is usually a meaningless string, such as any of the following:

Epolife

InstallMac

Javeview

Kuklorest

Manroling

Otwexplain

These are examples, not a complete list. The string could be anything. The point is that the same string will usually appear in the name of three or four files.

You could have more than one copy of the malware, with different values of something.

Move all such items to the Trash. If there are any other files with a name that begin with something, move them to the Trash also. After you've done that, there may not be anything left in the LaunchAgents folder; in that case, you can delete the folder, but otherwise don't delete it. Other files in the folder are not necessarily malicious (though they could be, if you also installed some other kind of malware.)

Log out or restart the computer. The trojan will now be inactive, but there are a few more components of it that should be cleaned up.

3. Open this folder in the same way as above:

~/Library/Application Support

and move to the Trash any subfolders named with the same something you found in Step 2.

Don't move the Application Support folder or anything else inside it.

4. Open the Applications folder. If there is an item with the same name as in Step 3, or any of the other names listed in Step 2, or with the name "Zip Devil," drag it to the Trash.

If in doubt, press the key combination option-command-4 to arrange the apps by date added. Look at the apps that have been added since you first noticed the problem. If there is one you don't recognize, drag it to the Trash.

Empty the Trash.

If you get an alert that the application is in use, force it to quit.

5. From the Safari menu bar, select

Safari Preferences... Extensions

Uninstall all extensions you don't know you need. If in doubt, remove all of them. None is required for normal operation. Do the equivalent in the Chrome and Firefox browsers, if you use either of those.

6. Reset the home page in each of your browsers, if it was changed. In Safari, first load the home page you want, then select

Safari Preferences... General

and click

Set to Current Page

What is "AppMH" and why does it use up all of my memory?

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