Anti Malware Windows 11

[Epicuro Kishore]

Malwareis malicious software and it comes in a lot of different varieties. Viruses, ransomware, spyware, and more are all types of malware. Microsoft Defender has powerful built-in features that can help protect your device against malware.

If you're concerned and want to have Microsoft Defender run a scan right now, you can do that by going to the Device protection page from the Microsoft Defender dashboard. For more information see How to start a scan for malware in Microsoft Defender

If Defender finds malware on your device it'll block it, notify you, and try to remove the malware if it can. In some instances Defender may need you to take some actions such as quarantining or removing the dangerous file or process.

Did you know you can try the features in Microsoft Defender XDR for Office 365 Plan 2 for free? Use the 90-day Defender for Office 365 trial at the Microsoft Defender portal trials hub. Learn about who can sign up and trial terms here.

In Microsoft 365 organizations with mailboxes in Exchange Online or standalone Exchange Online Protection (EOP) organizations without Exchange Online mailboxes, email messages are automatically protected against malware by EOP. Some of the major categories of malware are:

EOP offers multi-layered malware protection that's designed to catch all known malware in Windows, Linux, and Mac that travels into or out of your organization. The following options help provide anti-malware protection:

In EOP, messages that are found to contain malware in any attachments are quarantined*. Whether the recipients can view or otherwise interact with the quarantined messages is controlled by quarantine policies. By default, messages that were quarantined due to malware can only be viewed and released by admins. Users can't release their own quarantined malware messages, regardless of any available settings that admins configure. For more information, see the following articles:

* Malware filtering is skipped on SecOps mailboxes that are identified in the advanced delivery policy. For more information, see Configure the advanced delivery policy for third-party phishing simulations and email delivery to SecOps mailboxes.

Anti-malware policies also contain a common attachments filter. Messages that contain the specified file types are automatically identified as malware. For more information, see the Common attachments filter in anti-malware policies section later in this article.

To configure the default anti-malware policy, and to create, modify, and remove custom anti-malware policies, see Configure anti-malware policies. In the Standard and Strict preset security policies, the anti-malware policy settings are already configured and unmodifiable as described in EOP anti-malware policy settings.

If you disagree with the malware verdict, you can report the message attachment to Microsoft as a false positive (good attachment marked as bad) or a false negative (bad attachment allowed). For more information, see How do I report a suspicious email or file to Microsoft?.

Recipient filters use conditions and exceptions to identify the internal recipients that the policy applies to. At least one condition is required in custom policies. Conditions and exceptions aren't available in the default policy (the default policy applies to all recipients). You can use the following recipient filters for conditions and exceptions:

Different types of conditions use AND logic. The recipient must match all of the specified conditions for the policy to apply to them. For example, you configure a condition with the following values:

There are certain types of files that you really shouldn't send via email (for example, executable files). Why bother scanning these types of files for malware when you should block them all, anyway? That's where the common attachments filter comes in. The file types that you specify are automatically identified as malware.

A list of default file types is used in the default anti-malware policy, in custom anti-malware policies that you create, and in the anti-malware policies in the Standard and Strict preset security policies.

The common attachments filter uses best effort true type matching to detect the file type, regardless of the filename extension. True type matching uses file characteristics to determine the real file type (for example, leading and trailing bytes in the file). For example, if an exe file is renamed with a txt filename extension, the common attachments filter detects the file as an exe file.

ZAP for malware quarantines messages that are found to contain malware after they've been delivered to Exchange Online mailboxes. By default, ZAP for malware is turned on, and we recommend that you leave it on. For more information, see Zero-hour auto purge (ZAP) for malware.

Quarantine policies define what users are able to do to quarantined messages, and whether users receive quarantine notifications. By default, recipients don't receive notifications for messages that were quarantined as malware, and users can't release their own quarantined malware messages, regardless of any available settings that admins configure. For more information, see Anatomy of a quarantine policy.

You can specify an additional recipient (an admin) to receive notifications for malware detected in messages from internal or external senders. You can customize the From address, subject, and message text for internal and external notifications.

If they're turned on, the Standard and Strict preset security policies are applied before any custom anti-malware policies or the default policy (Strict is always first). If you create multiple custom anti-malware policies, you can specify the order that they're applied. Policy processing stops after the first policy is applied (the highest priority policy for that recipient).

For more information about the order of precedence and how multiple policies are evaluated, see Order and precedence of email protection and Order of precedence for preset security policies and other policies.

Recently my organization had to implement Anti-Malware software on Windows Servers and it has had some detrimental results where processes such as building/rebuilding address locators with suggestions (memory hog) no longer work. As such, I was wondering if other organizations ran across similar issues and had to re-configure their Anti-Malware software (e.g. white-listing exes and dlls) and/or modifying server architecture (e.g. increase RAM, CPU).

This issue looked like it was resolved by white-listing a file, but now the anti-malware software is preventing any new data from being published up to AGOL from ArcMap (Data that is already up in AGOL can be successfully overwritten though).

I am just adding specific information about an Anti-Malware software exception that I needed to add to my environment in order for address locators with suggestions to be able to be successfully built/rebuilt (I increased both CPU and memory but these changes did not solve the problem - they most likely helped to keep CPU or memory use from spiking).

I don't have anything specific in response to your post but I'm beginning to suspect the installation and use of Malwarebytes to be the cause of many ArcGIS Server problems that we've been having recently. And that's exactly how it started in our environment - address locators started failing to provide a suggestion list and were no longer rebuild-able. Also, our servers have been failing periodically (services no longer rendered even though the server resource monitor was still showing plenty of resources available, remote control interface was VERY slow, rebooting yesterday afternoon and this morning took FOREVER for everything to come back up, etc...) and I noticed that Malwarebytes was consuming a very high percentage of processor resources on a reboot this morning, which held up the start of ESRI's Java services and the gazillion arcsoc.exe processes that needed to crank back up. And I'm talking a 15-20 minute wait time before everything ArcGIS Server-wise came back up. If there are any ESRI staff out there, please chime in on this issue. Especially if there's any malware current testing being done for ArcGIS Enterprise environments. It's making our GIS services environment unreliable.

In my environment I thought the anti-malware software was just preventing the address locator from being rebuilt, but after finding the dll to whitelist in the anti-malware software for that component, I'm also finding the anti-malware software is not allowing python to stop the geocode service. As such, I need to research what file (dll most likely) I will need to whitelist in the anti-malware software for python to be able to stop (and subsequently start) the geocode service.

Are you the person at your org responsible for administering the anti-malware software or is that a different IT person? At my org, one of the anti-malware admins needed to scour the anti-malware logs to discover the file that was being blocked.

Before you ran into this problem, did you have an automated solution to updating your geocode service? I ask because I have 3 python scripts that are called from a bat file (stop geocode service, rebuild address locator, start geocode service). I thought the anti-malware software was just blocking the python script to rebuild the address locator, but it is also blocking the stop and start geocode service python scripts as well so I still need to find out what dll to whitelist for those scripts.

This has been quite a pain staking experience to determine the root cause of this issue and I wish ESRI had some general guidelines (There are many anti-malware software packages) or a white paper to help GIS admins setup anti-malware software rules that will work with ESRI's software.

"Cisco AMP (Anti Malware Protection) barred ArcMap from writing service definition files to the C drive. This would explain why the customer was able to publish when the staging folder was on a network drive. The user disabled Cisco AMP and was able to publish."

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