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Defender for Endpoint - macOS scan takes 1 second
Hello, We use Defender for Endpoint on macOS deployed by Mosyle MDM. However, we noticed when user run quick or full scan that action takes 1 second and that is it - 0 files scanned. This used to work before; I happen to have a screenshot: Now, if I run scan from command line, again the same: We use config profiles from here: https://github.com/microsoft/mdatp-xplat/tree/master/macos/mobileconfig/profiles mdatp health output: Did anyone have this issue? Thanks!
Kql query that search reg key
Hay I created the next kql query but unfraternally i get O devices on the results : // Search for creation, modification, or deletion events for the specified ESU registry key DeviceRegistryEvents | where RegistryKey has_any (@"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SoftwareProtectionPlatform\ESU", @"HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SoftwareProtectionPlatform\ESU") | project Timestamp, DeviceName, ActionType, RegistryKey, RegistryValueName, RegistryValueData, InitiatingProcessFileName, InitiatingProcessCommandLine | sort by Timestamp desc Am I doing something wrong? Thanks Elad.
Hundreds of DSM-Synology NAS work files are intercepted by Defender as threats!
Hi everyone. . . Sorry, long... For a couple of days now, I've been experiencing an annoying, persistent, and unresolvable problem affecting the Synology Drive Client 3.5.2 working folder D:\.SynologyWorkingDirectory. I'm running Windows 11 Pro 64-bit v25H2, and a couple of days ago, I accidentally discovered that Windows Defender has become incredibly slow when launched from its taskbar icon. Once I opened Defender, it presented a report with HUNDREDS (!) of threats, all caused by (temporary?) files in the hidden working folder "D:\.SynologyWorkingDirectory." The vast majority of the threats were eliminated. However, a few were classified as "severe" and warned that Defender may not have been able to completely eliminate the threat. I'm almost certain these aren't real threats, partly because of my extreme care with my browsing habits and behavior, but primarily because there are hundreds of them and they're constantly being created, exclusively in the D:\.SynologyWorkingDirectory folder. Defender, for its part, constantly deletes them, making it incredibly slow, and opening its history is equally slow. I ran a thorough system scan with Defender, both online and offline, but nothing was found. I also ran a scan with MalwareBytes, and nothing was found, perhaps also because the files are quickly deleted by Defender. I therefore suspect that Windows Defender has arbitrarily classified Synology's temporary files as threats. Even deleting Windows Defender's history was a painstaking task due to numerous (!) failed attempts due to the low-level and operational protections in Windows 11 Pro 64-bit v25H2. The only solution was to boot WinRE from a Windows installation USB drive, then delete the scans folder (D:\ProgramData\Microsoft\Windows Defender\Scans) from DOS. I also had to obtain the Bitlocker key, but clearing the history is pointless because it continually recreates itself with new detections! I'm forced to pause Synology Drive Client v3.5.2. How can I get support for this issue? Regards . .
Question malwares
Are the following malware programs that modify, damage, corrupt, or delete various files from your PC? all malware types operates malicious operations in files? Trojan:Win32/Wacatac.C!ml, Trojan.DownLoader47.36298, TrojanPSW.Rhadamanthys, Trojan.Win32.Agent.xcajyl? When a free antivirus program like Kaspersky Free and Microsoft Defender Free doesn't have a malware signature database and it doesn't appear in a complete scan, is it still active and all protection barriers have been breached? without signature is dead antivirus?Question malwares behavior
1) Does the behavior of the same malware on different PCs vary a lot? example: Trojan:Win32/Wacatac.C!ml PC 1 Trojan:Win32/Wacatac.C!ml, behavior: idle remains PC2 Trojan:Win32/Wacatac.C!ml, behavior: delete modify files in PC 2) Can a malware like Trojan:Win32/Wacatac.C!ml download other malware, let that perform actions, then delete itself—and would it evade future AV scans? Does it not leave traces to detect in the scan?
Microsoft Defender on Android (MAM-WE)
We are asking our users to install Microsoft Defender on their BYO devices but are running into issues with certain (not all) Android devices - they are getting the below error. What could be wrong? Their devices are not enrolled - we do not use MDM for personal devices. They are installing the regular Defender app from the public Play Store.High CPU Usage by Microsoft Defender Antivirus on Windows Server 2019 Azure VMs
Hello, I’m running into a recurring issue on Windows Server 2019 Datacenter VMs running in Azure where MsMpEng.exe (Antimalware Service Executable) consistently spikes CPU usage every day. Here’s what I’ve observed so far: Microsoft Defender pulls threat intelligence from the cloud continuously in real-time, in addition to multiple scheduled updates per day. Despite this continuous checking, I’ve noticed a consistent CPU spike only between 4:40 PM and 4:55 PM daily. During this time, Defender consumes 100% CPU. I’ve checked Task Scheduler and Defender scan settings — there are no scans or tasks scheduled during this period. Limiting CPU usage using Set-MpPreference -ScanAvgCPULoadFactor 30 has had no effect on these background maintenance routines. Automatic provisioning via Defender for Cloud is enabled on these Azure VMs, so the MDE agent installs and updates automatically. Logs from Microsoft-Windows-Windows Defender/Operational during the high CPU window: 10/2/2025 4:41:57 PM 2010 Microsoft Defender Antivirus used cloud protection to get additional security intelligence... 10/2/2025 4:41:57 PM 2010 Microsoft Defender Antivirus used cloud protection to get additional security intelligence... 10/2/2025 4:49:41 PM 1150 Endpoint Protection client is up and running in a healthy state... These logs confirm that Defender’s cloud intelligence updates and endpoint checks run exactly during the CPU spike window. Even though Defender continuously checks for cloud protection updates throughout the day, the CPU spike occurs only during this particular window. The pattern is consistent across multiple Azure VMs, suggesting this is part of Defender’s automated behavior. Questions for the community: Is this behavior expected for Azure VMs, or could it indicate a bug in Defender on Windows Server 2019? Is there a supported way to throttle, defer, or better manage CPU usage during these maintenance and cloud intelligence routines? Are there recommended best practices for always-on production environments in Azure to avoid performance degradation caused by Defender? Any guidance or advice would be really appreciated. Thanks, NikunjNeed report query for Vulnerable devices
Im looking for the query that generates the graph in the built in report that is found under Reports > Endpoints > Vulnerable devices The picture below is from the documentation https://learn.microsoft.com/en-us/defender-vulnerability-management/tvm-vulnerable-devices-report The issue with building the query by myself is that the table DeviceTvmSoftwareVulnerabilities does not contain Timestamp, if i join in the DeviceTvmSoftwareVulnerabilitiesKB then there is a PublishedDate atleast.
