{"id":3153,"date":"2026-07-30T10:11:26","date_gmt":"2026-07-30T10:11:26","guid":{"rendered":"https:\/\/windowsreport.com\/se\/owareaper-bakdorr-riktar-sig-mot-microsoft-exchange-anvandare\/"},"modified":"2026-07-30T10:11:26","modified_gmt":"2026-07-30T10:11:26","slug":"owareaper-bakdorr-riktar-sig-mot-microsoft-exchange-anvandare","status":"publish","type":"post","link":"https:\/\/windowsreport.com\/se\/owareaper-bakdorr-riktar-sig-mot-microsoft-exchange-anvandare\/","title":{"rendered":"OWAReaper-bakd\u00f6rr riktar sig mot Microsoft Exchange-anv\u00e4ndare"},"content":{"rendered":"\n<p>Rysk statssponsrade hackare utnyttjar en s\u00e5rbarhet i Microsoft Exchange Outlook Web Access f\u00f6r att distribuera OWAReaper, en bakd\u00f6rr f\u00f6r webbaserad e-post utformad f\u00f6r l\u00e5ngvarig \u00e5tkomst till postl\u00e5dor.<\/p>\n\n\n\n<p>Gruppen, k\u00e4nd som Laundry Bear och Void Blizzard, sp\u00e5ras 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. Bland m\u00e5len finns myndighetsorganisationer i USA och Europa, samt telekommunikations-, finans-, hotell- och flygbolag.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-attack-exploits-cve-2026-42897\">Attacken utnyttjar CVE-2026-42897<\/h2>\n\n\n\n<p>Kampanjen utnyttjar <a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2026-42897\" target=\"_blank\" rel=\"noopener noreferrer\">CVE-2026-42897<\/a>, en s\u00e5rbarhet f\u00f6r cross-site scripting i Outlook Web Access.<\/p>\n\n\n\n<p>S\u00e5rbarheten g\u00f6r att skadlig JavaScript kan k\u00f6ras n\u00e4r en anv\u00e4ndare \u00f6ppnar ett specialutformat e-postmeddelande i OWA:s l\u00e4sf\u00f6nster. Attacken kr\u00e4ver ingen skadlig bilaga, l\u00e4nk eller ytterligare klick.<\/p>\n\n\n\n<p>Microsoft offentliggjorde s\u00e5rbarheten den 14 maj. Tillg\u00e4ngliga bevis tyder dock p\u00e5 att Laundry Bear redan hade utnyttjat den som en nolldagarsattack f\u00f6re offentligg\u00f6randet.<\/p>\n\n\n\n<p>Angriparna g\u00f6r medvetet e-postmeddelandena ointressanta. En mottagare kan \u00f6ppna meddelandet, avf\u00e4rda det som skr\u00e4ppost och undvika att rapportera det eftersom det inte inneh\u00e5ller n\u00e5gra uppenbara skadliga l\u00e4nkar eller bilagor.<\/p>\n\n\n\n<p>Meddelandena g\u00f6mmer JavaScript-inl\u00e4sare och Base64-kodade nyttolaster i URL:er till ikoner f\u00f6r sociala medier. Den skadliga datan visas efter tecknet <code>#<\/code>, vilket g\u00f6r e-postmeddelandet sv\u00e5rare att identifiera som en attack.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-owareaper-removes-evidence-and-collects-credentials\">OWAReaper tar bort sp\u00e5r och samlar in autentiseringsuppgifter<\/h3>\n\n\n\n<p>OWAReaper fungerar helt och h\u00e5llet i Outlook Web Access l\u00e4sruta. N\u00e4r bakd\u00f6rren har k\u00f6rts skriver den om det ursprungliga e-postmeddelandet p\u00e5 Exchange-servern och tar bort sp\u00e5ren av utnyttjandet.<\/p>\n\n\n\n<p>D\u00e4refter samlar den in information om offret, inklusive e-postadress, anv\u00e4ndarnamn och konfigurationsdetaljer f\u00f6r Outlook.<\/p>\n\n\n\n<p>Skadeprogrammet skapar ocks\u00e5 osynliga webbl\u00e4sarelement som f\u00f6rs\u00f6ker f\u00e5nga upp autentiseringsuppgifter som automatiskt fylls i av en l\u00f6senordshanterare eller webbl\u00e4sarens autofyllfunktion.<\/p>\n\n\n\n<p>OWAReaper s\u00f6ker efter Outlook-till\u00e4gg med beh\u00f6righeten <code>ReadWriteMailbox<\/code>. N\u00e4r den hittar ett l\u00e4mpligt till\u00e4gg missbrukar den \u00e5tkomsten f\u00f6r att stj\u00e4la OAuth-token.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-mailbox-permissions-create-server-side-persistence\">Postl\u00e5debeh\u00f6righeter skapar best\u00e4ndighet p\u00e5 serversidan<\/h3>\n\n\n\n<p>Bakd\u00f6rren kan ge \u00e4garbeh\u00f6righeter \u00f6ver postl\u00e5dan till Exchange Default-anv\u00e4ndaren f\u00f6r alla e-postmappar. Denna konfiguration kan g\u00f6ra det m\u00f6jligt f\u00f6r en angripare att komma \u00e5t den komprometterade postl\u00e5dan via ett annat autentiserat konto inom organisationen.<\/p>\n\n\n\n<p>Eftersom Exchange lagrar dessa beh\u00f6righeter p\u00e5 servern kan en ominstallation av offrets dator inte n\u00f6dv\u00e4ndigtvis ta bort angriparen. Att byta offrets l\u00f6senord kan ocks\u00e5 misslyckas med att blockera \u00e5tkomst om de skadliga postl\u00e5debeh\u00f6righeterna och stulna OAuth-token f\u00f6rblir aktiva.<\/p>\n\n\n\n<p>OWAReaper skapar ytterligare en best\u00e4ndighetsmekanism via offlinecachen i Outlook Web Access. Den aktiverar OWA-cachning och injicerar en skadlig iframe i meddelanden som lagras i webbl\u00e4sarens IndexedDB-databas.<\/p>\n\n\n\n<p>Iframen k\u00f6rs varje g\u00e5ng offret \u00f6ppnar ett f\u00f6rgiftat meddelande fr\u00e5n offlinecachen. Den h\u00e4r metoden fungerar oberoende av postl\u00e5debeh\u00f6righeterna p\u00e5 serversidan.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-commands-hidden-in-github-and-email-messages\">Kommandon g\u00f6mda i GitHub och e-postmeddelanden<\/h3>\n\n\n\n<p>OWAReaper st\u00f6der tv\u00e5 metoder f\u00f6r kommando och kontroll.<\/p>\n\n\n\n<p>Den f\u00f6rsta metoden anv\u00e4nder krypterade kommandon g\u00f6mda i commit-meddelanden p\u00e5 GitHub. Den andra bygger p\u00e5 specialformaterade e-postmeddelanden som skickas direkt till den komprometterade postl\u00e5dan.<\/p>\n\n\n\n<p>F\u00f6r datast\u00f6ld skickar skadeprogrammet fr\u00e4mst krypterad information via HTTPS \u00f6ver dom\u00e4ner f\u00f6r bildinneh\u00e5llsn\u00e4tverk. Det krypterar data som placeras i s\u00f6kv\u00e4gar f\u00f6r beg\u00e4ran med AES-CTR.<\/p>\n\n\n\n<p>En sekund\u00e4r kanal skickar stulen information direkt till en angriparkontrollerad server om den prim\u00e4ra metoden misslyckas.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-organizations-should-review-exchange-permissions\">Organisationer b\u00f6r granska Exchange-beh\u00f6righeter<\/h3>\n\n\n\n<p>Proofpoint publicerade ett begr\u00e4nsat antal indikatorer p\u00e5 kompromettering, inklusive skadliga dom\u00e4ner och HTML som inneh\u00e5ller utnyttjandet och nyttolasten.<\/p>\n\n\n\n<p>Organisationer b\u00f6r installera Microsofts s\u00e4kerhetsuppdatering f\u00f6r CVE-2026-42897 och inspektera sina Exchange-milj\u00f6er efter tecken p\u00e5 intr\u00e5ng. Administrat\u00f6rer b\u00f6r granska:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Beh\u00f6righeter f\u00f6r postl\u00e5dor tilldelade till Default-anv\u00e4ndare<\/li>\n\n\n\n<li>Outlook-till\u00e4gg med omfattande postl\u00e5de\u00e5tkomst<\/li>\n\n\n\n<li>Misst\u00e4nkt aktivitet med OAuth-token<\/li>\n\n\n\n<li>Ovanliga API-f\u00f6rfr\u00e5gningar till GitHub<\/li>\n\n\n\n<li>Potentiellt f\u00f6rgiftade meddelanden som lagras i OWA-cacher<\/li>\n<\/ul>\n\n\n\n<p>L\u00f6senordsbyten och ominstallation av enheter kanske inte fullst\u00e4ndigt tar bort OWAReaper eftersom angripare kan beh\u00e5lla \u00e5tkomst via server-side-beh\u00f6righeter och cachade offline-meddelanden.<\/p>\n\n\n\n<p>I andra s\u00e4kerhetsnyheter har hackare anv\u00e4nt Wi-Fi p\u00e5 hotell f\u00f6r att stj\u00e4la Microsoft 365-konton, medan Chaos ransomware anv\u00e4nder msaRAT f\u00f6r att d\u00f6lja trafik i Chrome och Edge.<\/p>\n\n\n\n<p>F\u00f6r att bem\u00f6ta framv\u00e4xande cyberhot har Microsoft \u00e4ven sl\u00e4ppt den nya modellen MAI-Cyber-1-Flash.<\/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>Rysk statssponsrade hackare utnyttjar en s\u00e5rbarhet i Microsoft Exchange Outlook Web Access f\u00f6r att distribuera OWAReaper, en bakd\u00f6rr f\u00f6r webbaserad e-post utformad f\u00f6r l\u00e5ngvarig \u00e5tkomst till postl\u00e5dor. Gruppen, k\u00e4nd som Laundry Bear och Void Blizzard, sp\u00e5ras av Proofpoint som TA488. Bland m\u00e5len finns myndighetsorganisationer i USA och Europa, samt telekommunikations-, finans-, hotell- och flygbolag. Attacken [&hellip;]<\/p>\n","protected":false},"author":49,"featured_media":3154,"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-3153","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\u00f6rr riktar sig mot Microsoft Exchange-anv\u00e4ndare - WindowsReport SE (Swedish)<\/title>\n<meta name=\"description\" content=\"OWAReaper utnyttjar CVE-2026-42897 f\u00f6r att stj\u00e4la OAuth-tokens, \u00e4ndra brevl\u00e5debeh\u00f6righeter och finnas kvar i Exchange-konton.\" \/>\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\/se\/owareaper-bakdorr-riktar-sig-mot-microsoft-exchange-anvandare\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"OWAReaper-bakd\u00f6rr riktar sig mot Microsoft Exchange-anv\u00e4ndare\" \/>\n<meta property=\"og:description\" content=\"OWAReaper utnyttjar CVE-2026-42897 f\u00f6r att stj\u00e4la OAuth-tokens, \u00e4ndra brevl\u00e5debeh\u00f6righeter och finnas kvar i Exchange-konton.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/windowsreport.com\/se\/owareaper-bakdorr-riktar-sig-mot-microsoft-exchange-anvandare\/\" \/>\n<meta property=\"og:site_name\" content=\"WindowsReport SE (Swedish)\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-30T10:11:26+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/windowsreport.com\/se\/wp-content\/uploads\/sites\/14\/2026\/07\/outlook-clicking-bug.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=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/windowsreport.com\\\/se\\\/owareaper-bakdorr-riktar-sig-mot-microsoft-exchange-anvandare\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/se\\\/owareaper-bakdorr-riktar-sig-mot-microsoft-exchange-anvandare\\\/\"},\"author\":{\"name\":\"Milan Stanojevic\",\"@id\":\"https:\\\/\\\/windowsreport.com\\\/se\\\/#\\\/schema\\\/person\\\/e3910b02e4592db47a0eb303765a3a25\"},\"headline\":\"OWAReaper-bakd\u00f6rr riktar sig mot Microsoft Exchange-anv\u00e4ndare\",\"datePublished\":\"2026-07-30T10:11:26+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/se\\\/owareaper-bakdorr-riktar-sig-mot-microsoft-exchange-anvandare\\\/\"},\"wordCount\":753,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/se\\\/owareaper-bakdorr-riktar-sig-mot-microsoft-exchange-anvandare\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/windowsreport.com\\\/se\\\/wp-content\\\/uploads\\\/sites\\\/14\\\/2026\\\/07\\\/outlook-clicking-bug.jpg\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/windowsreport.com\\\/se\\\/owareaper-bakdorr-riktar-sig-mot-microsoft-exchange-anvandare\\\/#respond\"]}],\"copyrightYear\":\"2026\",\"copyrightHolder\":{\"@id\":\"https:\\\/\\\/windowsreport.com\\\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/windowsreport.com\\\/se\\\/owareaper-bakdorr-riktar-sig-mot-microsoft-exchange-anvandare\\\/\",\"url\":\"https:\\\/\\\/windowsreport.com\\\/se\\\/owareaper-bakdorr-riktar-sig-mot-microsoft-exchange-anvandare\\\/\",\"name\":\"OWAReaper-bakd\u00f6rr riktar sig mot Microsoft Exchange-anv\u00e4ndare - 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