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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: 935098" data-attributes="member: 91050"><p>Hi Andy,</p><p></p><p>I just did a quick test this morning with VirusTotal.</p><p>I have submitted THREE versions of the same script.</p><p>The ONLY difference between the 3 versions is that</p><p>- I have moved the order of some variable initializations in the top first 10 lines in second version,</p><p>- and in more changed the name of the objects : XHR -> XHttpReg, WshShell -> WSHRun in the 3rd one.</p><p></p><p>As a result, the three scripts are <strong>the same</strong>, but since they do not have the same SHA256, they are analysed 3 times separately.</p><p>And what is fantastic is that we do not have the same result !!!!!</p><p></p><p>Here are the three VirusTotal URL :</p><p>[URL unfurl="true"]https://www.virustotal.com/gui/file/6f3555298f326bc1c0de37e4f86c9c2e6643360b4af2b658f302f9f1cbdaaf4e/detection[/URL]</p><p>[URL unfurl="true"]https://www.virustotal.com/gui/file/b0c19a3f687ef51794ed518211de2d2f5d0b08421b22835b9e155b849e433c82/detection[/URL]</p><p>[URL unfurl="true"]https://www.virustotal.com/gui/file/e37ac74afddbf2b78995abfba099b7e10635f98425799975d90b468d70206847/detection[/URL]</p><p></p><p>In particular, Microsoft Defender sees again the TrojanDownloader:HTML/Adodb.gen!A except in the first version, the one you submitted as "false positive".</p><p></p><p>My conclusion : All the AV that give the same result for the three are maybe good analysts (and maybe not), but those that do not even give the same result cannot be trustful !</p><p>Only McAfee, Nano and Rising, plus of course the 50+ AV that say (and it's the reality...) that there is no threat in the script, are then "credible"</p><p>In particular, for this reason, I'm now very reluctant to keep Microsoft Defender.... How to be confident ?</p></blockquote><p></p>
[QUOTE="LaurentG, post: 935098, member: 91050"] Hi Andy, I just did a quick test this morning with VirusTotal. I have submitted THREE versions of the same script. The ONLY difference between the 3 versions is that - I have moved the order of some variable initializations in the top first 10 lines in second version, - and in more changed the name of the objects : XHR -> XHttpReg, WshShell -> WSHRun in the 3rd one. As a result, the three scripts are [B]the same[/B], but since they do not have the same SHA256, they are analysed 3 times separately. And what is fantastic is that we do not have the same result !!!!! Here are the three VirusTotal URL : [URL unfurl="true"]https://www.virustotal.com/gui/file/6f3555298f326bc1c0de37e4f86c9c2e6643360b4af2b658f302f9f1cbdaaf4e/detection[/URL] [URL unfurl="true"]https://www.virustotal.com/gui/file/b0c19a3f687ef51794ed518211de2d2f5d0b08421b22835b9e155b849e433c82/detection[/URL] [URL unfurl="true"]https://www.virustotal.com/gui/file/e37ac74afddbf2b78995abfba099b7e10635f98425799975d90b468d70206847/detection[/URL] In particular, Microsoft Defender sees again the TrojanDownloader:HTML/Adodb.gen!A except in the first version, the one you submitted as "false positive". My conclusion : All the AV that give the same result for the three are maybe good analysts (and maybe not), but those that do not even give the same result cannot be trustful ! Only McAfee, Nano and Rising, plus of course the 50+ AV that say (and it's the reality...) that there is no threat in the script, are then "credible" In particular, for this reason, I'm now very reluctant to keep Microsoft Defender.... How to be confident ? [/QUOTE]
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