{"id":632,"date":"2022-08-09T12:53:02","date_gmt":"2022-08-09T10:53:02","guid":{"rendered":"https:\/\/hejdu.se\/?p=632"},"modified":"2023-05-30T21:36:37","modified_gmt":"2023-05-30T19:36:37","slug":"antivirus-falsklarm-i-zip-fil-sa-kollar-man","status":"publish","type":"post","link":"https:\/\/hejdu.se\/?p=632","title":{"rendered":"Antivirus falsklarm? S\u00e5 kollar du"},"content":{"rendered":"<p>H\u00e4r visas vad du kan g\u00f6ra om du misst\u00e4nker att ditt antivirusprogram larmar falskt.<\/p>\n<p>Bakgrund:<br \/>\nMicrosoft antivirusprogram p\u00e5 datorn larmade att en fil inneh\u00f6ll en farlig trojan: &#8221;<strong>Trojan:Script\/Wacatac.B!ml<\/strong>&#8221;. Det stod att filen &#8221;\u00e4r farlig och k\u00f6r kommandon fr\u00e5n en hackare&#8221;:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-634\" src=\"https:\/\/hejdu.se\/wp-content\/uploads\/2022\/08\/antiviruslarm.png\" alt=\"\" width=\"500\" height=\"210\" \/><\/p>\n<p>Antivirusprogrammet hade flyttat filen till en karant\u00e4nmapp, och ville att jag skulle radera filen omg\u00e5ende.<\/p>\n<p>Den utpekade lilla filen \u00e4r en zip-fil (som man f\u00f6rvarar andra filer i, ofta i komprimerad form), som jag hade skapat med programmet &#8221;7-Zip&#8221;. Filen inneh\u00e5ller endast n\u00e5gra enkla textfiler (.txt), som knappast kan vara skadliga.<br \/>\n\u00c4r det programmet 7-Zip som \u00e4r infekterat och som har \u00f6verf\u00f6rt n\u00e5t till zipfilen? Eller&#8230; \u00e4r det falsklarm?<\/p>\n<h4>Kolla om det \u00e4r falsklarm<\/h4>\n<p>Testa den utpekade zip-filen online hos sajten VIRUSTOTAL*:<br \/>\n<a href=\"https:\/\/www.virustotal.com\/gui\/home\/upload\" target=\"_blank\" rel=\"noopener\">www.virustotal.com\/gui\/home\/upload<\/a><br \/>\nsom l\u00e5ter massor av antivirussystem fr\u00e5n olika tillverkare analysera din fil. (T.ex. F-secure, McAfee, Acronis, Avast, Eset-nod32, Panda, Symantec, Microsoft och m\u00e5nga fler).<\/p>\n<p>Jag laddade allts\u00e5 upp zipfilen till VirusTotal (efter att ha &#8221;\u00e5terst\u00e4llt&#8221; filen till mappen d\u00e4r den l\u00e5g innan antivirusprogrammet flyttade den till karant\u00e4n).<\/p>\n<p>Av ett sextiotal analyser var det endast Microsoft som larmade att den filen inneh\u00e5ller n\u00e5t farligt:<\/p>\n<figure id=\"attachment_635\" aria-describedby=\"caption-attachment-635\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-635 size-full\" src=\"https:\/\/hejdu.se\/wp-content\/uploads\/2022\/08\/virusanalys-resultat.png\" alt=\"\" width=\"600\" height=\"1059\" \/><figcaption id=\"caption-attachment-635\" class=\"wp-caption-text\">Analysresultat hos VIRUSTOTAL.com<\/figcaption><\/figure>\n<hr \/>\n<p>S\u00f6kning med Bing\/Google visar ocks\u00e5 att fler anv\u00e4ndare r\u00e5kat ut f\u00f6r liknade.<\/p>\n<p>Jag analyserade ocks\u00e5 zip-programmet (7-Zip, som man kan skapa zipfiler med). Analysen gjordes b\u00e5de online med VirusTotal, samt med mitt lokala Microsoft antivirusprogram.<br \/>\nIngen hittade n\u00e5gra farligheter. Dvs noll (0) larm.<\/p>\n<hr \/>\n<p>Slutsats: det var falsklarm av Microsoft, den zipfilen \u00e4r ofarlig.<\/p>\n<hr \/>\n<p><span style=\"color: #ff6600;\">Komplettering 11 augusti:<\/span><br \/>\nfilen som larmade h\u00e4romdan testades igen hos VirusTotal n\u00e5gra dar senare, d\u00e5 blev resultatet noll (0) larm.<br \/>\nInte heller lokala Microsoft antivirusprogrammet larmar l\u00e4ngre f\u00f6r den filen (programmets virusdefinitioner uppdateras kontinuerligt, automatiskt, s\u00e5 Microsoft tycks ha \u00e5tg\u00e4rdat felet).<\/p>\n<hr \/>\n<hr \/>\n<p>* Om VirusTotal (som k\u00f6ptes 2012 av Google):<\/p>\n<p>&#8221;VirusTotal is a website created by the Spanish security company Hispasec Sistemas. Launched in June 2004, it was acquired by Google in September 2012. The company&#8217;s ownership switched in January 2018 to Chronicle, a subsidiary of Google.&#8221;<br \/>\nK\u00e4lla:<br \/>\n<a href=\"https:\/\/en.wikipedia.org\/wiki\/VirusTotal\" target=\"_blank\" rel=\"noopener\">en.wikipedia.org\/wiki\/VirusTotal<\/a><\/p>\n<p>&#8221;VirusTotal inspects items with over 70 antivirus scanners and URL\/domain blocklisting services, in addition to a myriad of tools to extract signals from the studied content. Any user can select a file from their computer using their browser and send it to VirusTotal.<br \/>\n(&#8230;)<br \/>\nVirusTotal is free to end users for non-commercial use in accordance with our Terms of Service. Though we work with engines belonging to many different organizations, VirusTotal does not distribute or promote any of those third-party engines. We simply act as an aggregator of information. This allows us to offer an objective and unbiased service to our users.&#8221;<br \/>\nK\u00e4lla:<br \/>\n<a href=\"https:\/\/support.virustotal.com\/hc\/en-us\/articles\/115002126889-How-it-works\" target=\"_blank\" rel=\"noopener\">support.virustotal.com\/hc\/en-us\/articles\/115002126889-How-it-works<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>H\u00e4r visas vad du kan g\u00f6ra om du misst\u00e4nker att ditt antivirusprogram larmar falskt. Bakgrund: Microsoft antivirusprogram p\u00e5 datorn larmade att en fil inneh\u00f6ll en farlig trojan: &#8221;Trojan:Script\/Wacatac.B!ml&#8221;. Det stod att filen &#8221;\u00e4r farlig och k\u00f6r kommandon fr\u00e5n en hackare&#8221;: Antivirusprogrammet hade flyttat filen till en karant\u00e4nmapp, och ville att jag skulle radera filen omg\u00e5ende. &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/hejdu.se\/?p=632\" class=\"more-link\">Forts\u00e4tt l\u00e4sa<span class=\"screen-reader-text\"> \u201dAntivirus falsklarm? S\u00e5 kollar du\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"_links":{"self":[{"href":"https:\/\/hejdu.se\/index.php?rest_route=\/wp\/v2\/posts\/632"}],"collection":[{"href":"https:\/\/hejdu.se\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hejdu.se\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hejdu.se\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hejdu.se\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=632"}],"version-history":[{"count":0,"href":"https:\/\/hejdu.se\/index.php?rest_route=\/wp\/v2\/posts\/632\/revisions"}],"wp:attachment":[{"href":"https:\/\/hejdu.se\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=632"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hejdu.se\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=632"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hejdu.se\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=632"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}