{"id":1115,"date":"2026-07-30T10:20:57","date_gmt":"2026-07-30T10:20:57","guid":{"rendered":"https:\/\/windowsreport.com\/no\/owareaper-backdoor-retter-seg-mot-microsoft-exchange-brukere-3\/"},"modified":"2026-07-30T10:22:53","modified_gmt":"2026-07-30T10:22:53","slug":"owareaper-backdoor-retter-seg-mot-microsoft-exchange-brukere-3","status":"publish","type":"post","link":"https:\/\/windowsreport.com\/no\/owareaper-backdoor-retter-seg-mot-microsoft-exchange-brukere-3\/","title":{"rendered":"OWAReaper-bakd\u00f8r rammer Microsoft Exchange-brukere"},"content":{"rendered":"\n<p>Russiske statssponsede hackere utnytter et s\u00e5rbarhet i Microsoft Exchange Outlook Web Access for \u00e5 distribuere OWAReaper, en webmail-bakd\u00f8r designet for langsiktig tilgang til postbokser.<\/p>\n\n\n\n<p>Gruppen, kjent som Laundry Bear og Void Blizzard, spores av <a href=\"https:\/\/www.proofpoint.com\/us\/blog\/threat-insight\/cleaning-out-inboxes-ta488-comes-outlook-another-half-click-exploit\" target=\"_blank\" rel=\"noopener noreferrer\">Proofpoint<\/a> som TA488. Dens m\u00e5l inkluderer offentlige organisasjoner i USA og Europa, samt telekommunikasjons-, finans-, hotell- og luftfartsselskaper.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-attack-exploits-cve-2026-42897\">Angrepet utnytter CVE-2026-42897<\/h2>\n\n\n\n<p>Kampanjen utnytter <a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2026-42897\" target=\"_blank\" rel=\"noopener noreferrer\">CVE-2026-42897<\/a>, et s\u00e5rbarhet for cross-site scripting i Outlook Web Access.<\/p>\n\n\n\n<p>S\u00e5rbarheten gj\u00f8r at ondsinnet JavaScript kan kj\u00f8res n\u00e5r en bruker \u00e5pner en spesiallaget e-post i OWA-leseruten. Angrepet krever ingen ondsinnet vedlegg, lenke eller ekstra klikk.<\/p>\n\n\n\n<p>Microsoft offentliggjorde s\u00e5rbarheten 14. mai. Tilgjengelig dokumentasjon tyder imidlertid p\u00e5 at Laundry Bear allerede hadde utnyttet den som et zero-day-angrep f\u00f8r offentliggj\u00f8ringen.<\/p>\n\n\n\n<p>Angriperne gj\u00f8r bevisst at e-postene ser uviktige ut. En mottaker kan \u00e5pne meldingen, avfeie den som s\u00f8ppel og unng\u00e5 \u00e5 rapportere den fordi den ikke inneholder \u00e5penbare ondsinnede lenker eller vedlegg.<\/p>\n\n\n\n<p>Meldingene skjuler JavaScript-lastere og Base64-kodede nyttelaster inni URL-er til sosiale medier-ikoner. Den ondsinnede dataen vises etter <code>#<\/code>-tegnet, noe som gj\u00f8r e-posten vanskeligere \u00e5 identifisere som et angrep.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-owareaper-removes-evidence-and-collects-credentials\">OWAReaper fjerner bevis og samler inn p\u00e5loggingsinformasjon<\/h3>\n\n\n\n<p>OWAReaper opererer utelukkende inne i Outlook Web Access-leseruten. N\u00e5r den kj\u00f8rer, omskriver bakd\u00f8ren den opprinnelige e-posten p\u00e5 Exchange-serveren og fjerner bevis p\u00e5 utnyttelsen.<\/p>\n\n\n\n<p>Deretter samler den inn informasjon om offeret, inkludert e-postadresse, brukernavn og konfigurasjonsdetaljer for Outlook.<\/p>\n\n\n\n<p>Skadevaren lager ogs\u00e5 usynlige nettleserelementer som fors\u00f8ker \u00e5 fange opp p\u00e5loggingsinformasjon som automatisk fylles inn av en passordbehandler eller nettleserens autofullf\u00f8r-funksjon.<\/p>\n\n\n\n<p>OWAReaper s\u00f8ker etter Outlook-tillegg med <code>ReadWriteMailbox<\/code>-tillatelser. N\u00e5r den finner et passende tillegg, misbruker den denne tilgangen til \u00e5 stjele OAuth-tokener.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-mailbox-permissions-create-server-side-persistence\">Postbokstillatelser skaper persistens p\u00e5 serversiden<\/h3>\n\n\n\n<p>Bakd\u00f8ren kan gi eierniv\u00e5-postbokstillatelser til Exchange Default-brukeren p\u00e5 tvers av alle e-postmapper. Denne konfigurasjonen kan tillate en angriper \u00e5 f\u00e5 tilgang til den kompromitterte postboksen via en annen autentisert konto i organisasjonen.<\/p>\n\n\n\n<p>Fordi Exchange lagrer disse tillatelsene p\u00e5 serveren, kan ikke reinstallering av offerets datamaskin n\u00f8dvendigvis fjerne angriperen. \u00c5 endre brukerens passord kan ogs\u00e5 mislykkes i \u00e5 blokkere tilgangen hvis de ondsinnede postbokstillatelsene og stj\u00e5lne OAuth-tokener forblir aktive.<\/p>\n\n\n\n<p>OWAReaper skaper en annen persistensmekanisme gjennom Outlook Web Access&#8217; frakoblede hurtigbuffer. Den aktiverer OWA-hurtigbufring og injiserer en ondsinnet iframe i meldinger som er lagret i nettleserens IndexedDB-database.<\/p>\n\n\n\n<p>Iframen kj\u00f8res hver gang offeret \u00e5pner en forgiftet melding fra den frakoblede hurtigbufferen. Denne metoden fungerer uavhengig av postbokstillatelsene p\u00e5 serversiden.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-commands-hidden-in-github-and-email-messages\">Kommandoer skjult i GitHub- og e-postmeldinger<\/h3>\n\n\n\n<p>OWAReaper st\u00f8tter to kommando-og-kontroll-metoder.<\/p>\n\n\n\n<p>Den f\u00f8rste metoden bruker krypterte kommandoer skjult i GitHub commit-meldinger. Den andre er avhengig av spesialformaterte e-poster sendt direkte til den kompromitterte postboksen.<\/p>\n\n\n\n<p>For datatyveri sender skadevaren prim\u00e6rt kryptert informasjon over HTTPS gjennom domener for innholdsleveringsnettverk for bilder. Den krypterer data plassert i foresp\u00f8rselsstier med AES-CTR.<\/p>\n\n\n\n<p>En sekund\u00e6r kanal sender stj\u00e5let informasjon direkte til en angriperstyrt server n\u00e5r hovedmetoden mislykkes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-organizations-should-review-exchange-permissions\">Organisasjoner b\u00f8r gjennomg\u00e5 Exchange-tillatelser<\/h3>\n\n\n\n<p>Proofpoint publiserte et begrenset antall kompromissindikatorer, inkludert ondsinnede domener og HTML som inneholder utnyttelsen og nyttelasten.<\/p>\n\n\n\n<p>Organisasjoner b\u00f8r installere Microsofts sikkerhetsoppdatering for CVE-2026-42897 og inspisere Exchange-milj\u00f8ene sine for tegn p\u00e5 kompromittering. Administratorer b\u00f8r gjennomg\u00e5:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Postbokstillatelser tildelt Default-brukere<\/li>\n\n\n\n<li>Outlook-tillegg med omfattende postbokstilgang<\/li>\n\n\n\n<li>Mistenkelig aktivitet med OAuth-tokener<\/li>\n\n\n\n<li>Uvanlige GitHub API-foresp\u00f8rsler<\/li>\n\n\n\n<li>Potensielt forgiftede meldinger lagret i OWA-hurtigbuffere<\/li>\n<\/ul>\n\n\n\n<p>Tilbakestilling av passord og reinstallering av enheter fjerner kanskje ikke OWAReaper fullstendig fordi angriperne kan opprettholde tilgang gjennom serverside-tillatelser og hurtigbufrede meldinger fra frakoblet modus.<\/p>\n\n\n\n<p>I andre sikkerhetsnyheter har hackere blitt oppdaget i \u00e5 bruke hotell-Wi-Fi for \u00e5 stjele Microsoft 365-kontoer, mens Chaos-ransomware bruker msaRAT for \u00e5 skjule trafikk i Chrome og Edge.<\/p>\n\n\n\n<p>For \u00e5 m\u00f8te nye cybertrusler har Microsoft ogs\u00e5 lansert den nye MAI-Cyber-1-Flash-modellen.<\/p>\n\n\n\n<p>Via <a href=\"https:\/\/www.bleepingcomputer.com\/news\/security\/russian-hackers-exploit-exchange-owa-zero-day-for-long-term-mailbox-access\/\" target=\"_blank\" rel=\"noopener noreferrer\">BleepingComputer<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Russiske statssponsede hackere utnytter et s\u00e5rbarhet i Microsoft Exchange Outlook Web Access for \u00e5 distribuere OWAReaper, en webmail-bakd\u00f8r designet for langsiktig tilgang til postbokser. Gruppen, kjent som Laundry Bear og Void Blizzard, spores av Proofpoint som TA488. Dens m\u00e5l inkluderer offentlige organisasjoner i USA og Europa, samt telekommunikasjons-, finans-, hotell- og luftfartsselskaper. Angrepet utnytter CVE-2026-42897 [&hellip;]<\/p>\n","protected":false},"author":49,"featured_media":1116,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_enabled_clarity":"","footnotes":""},"categories":[1],"tags":[],"work":[],"class_list":["post-1115","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>OWAReaper-bakd\u00f8r rammer Microsoft Exchange-brukere - WindowsReport NO (Norwegen)<\/title>\n<meta name=\"description\" content=\"OWAReaper utnytter CVE-2026-42897 for \u00e5 stjele OAuth-tokens, endre postbokstillatelser og forbli i Exchange-kontoer.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/windowsreport.com\/no\/owareaper-backdoor-retter-seg-mot-microsoft-exchange-brukere-3\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"OWAReaper-bakd\u00f8r rammer Microsoft Exchange-brukere\" \/>\n<meta property=\"og:description\" content=\"OWAReaper utnytter CVE-2026-42897 for \u00e5 stjele OAuth-tokens, endre postbokstillatelser og forbli i Exchange-kontoer.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/windowsreport.com\/no\/owareaper-backdoor-retter-seg-mot-microsoft-exchange-brukere-3\/\" \/>\n<meta property=\"og:site_name\" content=\"WindowsReport NO (Norwegen)\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-30T10:20:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-30T10:22:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/windowsreport.com\/no\/wp-content\/uploads\/sites\/13\/2026\/07\/outlook-clicking-bug-6.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Milan Stanojevic\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@MilanStanojev17\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Milan Stanojevic\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/windowsreport.com\\\/no\\\/owareaper-backdoor-retter-seg-mot-microsoft-exchange-brukere-3\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/no\\\/owareaper-backdoor-retter-seg-mot-microsoft-exchange-brukere-3\\\/\"},\"author\":{\"name\":\"Milan Stanojevic\",\"@id\":\"https:\\\/\\\/windowsreport.com\\\/no\\\/#\\\/schema\\\/person\\\/e3910b02e4592db47a0eb303765a3a25\"},\"headline\":\"OWAReaper-bakd\u00f8r rammer Microsoft Exchange-brukere\",\"datePublished\":\"2026-07-30T10:20:57+00:00\",\"dateModified\":\"2026-07-30T10:22:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/no\\\/owareaper-backdoor-retter-seg-mot-microsoft-exchange-brukere-3\\\/\"},\"wordCount\":611,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/no\\\/owareaper-backdoor-retter-seg-mot-microsoft-exchange-brukere-3\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/windowsreport.com\\\/no\\\/wp-content\\\/uploads\\\/sites\\\/13\\\/2026\\\/07\\\/outlook-clicking-bug-6.jpg\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/windowsreport.com\\\/no\\\/owareaper-backdoor-retter-seg-mot-microsoft-exchange-brukere-3\\\/#respond\"]}],\"copyrightYear\":\"2026\",\"copyrightHolder\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/windowsreport.com\\\/no\\\/owareaper-backdoor-retter-seg-mot-microsoft-exchange-brukere-3\\\/\",\"url\":\"https:\\\/\\\/windowsreport.com\\\/no\\\/owareaper-backdoor-retter-seg-mot-microsoft-exchange-brukere-3\\\/\",\"name\":\"OWAReaper-bakd\u00f8r rammer Microsoft Exchange-brukere - 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