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Microsoft Defender
Microsoft Defender detects the file as malicious but does not remove it.
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<blockquote data-quote="Andy Ful" data-source="post: 974051" data-attributes="member: 32260"><p>From my experience with malicious downloads, Defender works differently with Edge (Chrome) and Firefox.</p><p></p><p>When I download a malicious file via Edge, the download is usually blocked by SmartScreen. If the file is not checked by SmartScreen (usually an archive), then after the download Defender shows an alert about the detected threat.</p><p></p><p>The same file but downloaded by Firefox (especially files in archives) does not trigger any alert from Defender (the file is not scanned). It is detected on execution or when it is directly accessed. Next, Defender usually asks about what action should be taken. In some cases, the remediation can take a few minutes. In my case, it never happened that Defender failed to quarantine or remove the downloaded file after it was detected and the action was chosen.</p><p></p><p>Another situation can happen when Defender detects the file which is actually used by another process (legal or malicious). In this case, the file cannot be removed until the calling process is active. This can also happen when alongside Defender another real-time protection is installed in the system.</p></blockquote><p></p>
[QUOTE="Andy Ful, post: 974051, member: 32260"] From my experience with malicious downloads, Defender works differently with Edge (Chrome) and Firefox. When I download a malicious file via Edge, the download is usually blocked by SmartScreen. If the file is not checked by SmartScreen (usually an archive), then after the download Defender shows an alert about the detected threat. The same file but downloaded by Firefox (especially files in archives) does not trigger any alert from Defender (the file is not scanned). It is detected on execution or when it is directly accessed. Next, Defender usually asks about what action should be taken. In some cases, the remediation can take a few minutes. In my case, it never happened that Defender failed to quarantine or remove the downloaded file after it was detected and the action was chosen. Another situation can happen when Defender detects the file which is actually used by another process (legal or malicious). In this case, the file cannot be removed until the calling process is active. This can also happen when alongside Defender another real-time protection is installed in the system. [/QUOTE]
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