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Microsoft Defender
How to prevent efficiently Defender from considering a given VBS script as containing a threat
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<blockquote data-quote="LaurentG" data-source="post: 935988" data-attributes="member: 91050"><p>Hi Andy,</p><p></p><p>I just did the test, and I confirm it's OK now, at least for this script.</p><p></p><p>To be very specific :</p><p>- In the<strong> exact script </strong>you uploaded to Microsoft, MS Defender do not detect any more any threat (neither TrojanDownloader:HTML/Adodb.gen!A nor Trojan:VBS/Mountsi.A!ml.), and this without any exclusion / whitelisting defined.</p><p></p><p>- In "similar" scripts obtained by slight modifications of the "original" script</p><p> - MS Defender continue to detect TrojanDownloader:HTML/Adodb.gen!A, but, as it was already the case before, this detection can be bypassed with Folder (or file) exclusion.</p><p> - MS Defender <strong>do not detect any more</strong> Trojan:VBS/Mountsi.A!ml. <strong>even if there is no exclusion defined</strong></p><p></p><p>This means that fix provided by MS with the <em>new security intelligence update version 1.333.1190.0.</em> (and above) enhances AMSI-based detections and avoids (at least) <strong>THIS </strong>specific "false positive" detection.</p><p></p><p>Nevertheless, the remaining question is : <strong>what would happen if AMSI-based threat was still detected</strong> ? <strong>And what will happen when such a detection will occur "erroneously" for a completely different script ?</strong> Will it be possible to "exclude it" for these scripts only ? </p><p>Let me remind you that this was the initial issue I raised with this thread : <u><strong>Ability to exclude A GIVEN SCRIPT from AMSI-based detection without excluding ALL AMSI-based detection.</strong></u></p><p></p><p>And since these scripts are no more detected with AMSI-based detections, <u><strong><u>we still cannot answer definitely to this question.</u></strong></u></p><p></p><p>Nevethless, there is at least one question we've been answered : <strong>It's now clear that you have very good relationship with Microsoft <img class="smilie smilie--emoji" loading="lazy" alt="😄" title="Grinning face with smiling eyes :smile:" src="https://cdn.jsdelivr.net/joypixels/assets/6.6/png/unicode/64/1f604.png" data-shortname=":smile:" /></strong></p></blockquote><p></p>
[QUOTE="LaurentG, post: 935988, member: 91050"] Hi Andy, I just did the test, and I confirm it's OK now, at least for this script. To be very specific : - In the[B] exact script [/B]you uploaded to Microsoft, MS Defender do not detect any more any threat (neither TrojanDownloader:HTML/Adodb.gen!A nor Trojan:VBS/Mountsi.A!ml.), and this without any exclusion / whitelisting defined. - In "similar" scripts obtained by slight modifications of the "original" script - MS Defender continue to detect TrojanDownloader:HTML/Adodb.gen!A, but, as it was already the case before, this detection can be bypassed with Folder (or file) exclusion. - MS Defender [B]do not detect any more[/B] Trojan:VBS/Mountsi.A!ml. [B]even if there is no exclusion defined[/B] This means that fix provided by MS with the [I]new security intelligence update version 1.333.1190.0.[/I] (and above) enhances AMSI-based detections and avoids (at least) [B]THIS [/B]specific "false positive" detection. Nevertheless, the remaining question is : [B]what would happen if AMSI-based threat was still detected[/B] ? [B]And what will happen when such a detection will occur "erroneously" for a completely different script ?[/B] Will it be possible to "exclude it" for these scripts only ? Let me remind you that this was the initial issue I raised with this thread : [U][B]Ability to exclude A GIVEN SCRIPT from AMSI-based detection without excluding ALL AMSI-based detection.[/B][/U] And since these scripts are no more detected with AMSI-based detections, [U][B][U]we still cannot answer definitely to this question.[/U][/B][/U] Nevethless, there is at least one question we've been answered : [B]It's now clear that you have very good relationship with Microsoft 😄[/B] [/QUOTE]
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