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Submission: On July 01 via manual from US — Scanned from DE
Submission: On July 01 via manual from US — Scanned from DE
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Text Content
___ This site uses JavaScript to provide a number of functions, to use this site please enable JavaScript in your browser. OpenSearch CXO REvolutionariesCareersPartnersSupport ShowContact UsOptions Get in touch1-408-533-0288Chat with us ShowSign InOptions Zscaler Cloud Portal | AdminZscaler Cloud Portal One | AdminZscaler Cloud Portal Two | AdminZscaler Cloud Portal Three | AdminZscaler Cloud Portal Beta | Adminadmin.zscloud.netZscaler Private Access Sign-In Home The Zscaler ExperienceProducts & SolutionsPlatformResourcesCompany Request a demoopen search open navigation The Zscaler Experience Zscaler: A Leader in the 2024 Gartner® Magic Quadrant™ for Security Service Edge (SSE) Get the full report Your world, secured Experience the transformative power of zero trust. 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Article 2. More blogs Copy URL Copy URL Recently, the Zscaler ThreatLabZ team came across various phishing attacks leveraging Microsoft Azure custom domains. These sites are signed with a Microsoft SSL certificate, so they are unlikely to raise suspicion about their authenticity. We notified Microsoft, who quickly engaged to shut these sites down, while we took action to detect and block 2,000 phishing attempts from these domains over a six-week period. In this blog, we will describe two of the prominent vectors used and we’ll show several examples of the phishing pages. The following figure depicts the phishing hits that were hosted using the Azure domain (Windows.net) and blocked by the Zscaler cloud. Fig 1: Phishing hits using the Azure domain web.core.windows.net (green) and blob.core.windows.net (orange) The following is the Whois lookup information related to the Windows.net domain. Fig 2: Whois lookup info for domain Windows.net domain For these phishing campaigns, the delivery vector was spam emails. CASE 1: In this case, the attacker sends a spam email to a user, appearing to come from a particular organization and notifying the user that seven emails have been quarantined. It states that in order to review the emails, the user has to log in using the work or school account. Fig 3: Spam email with direct phishing link If the user clicks the view emails button, it will redirect to the Outlook login phishing page (hxxps://onemailofice365(.)z13(.)web(.)core(.)windows(.)net/index(.)html). Fig 4: Outlook login phishing page Some users may get confused because of the unknown URL hosting the Outlook login page. To trick those users, the attackers have used the SSL certificate issued by Microsoft as shown below. Fig 5: SSL certificate page of the hosted phishing URL The following figure depicts the source code of the phishing page, which is used by attackers to collect users’ data. Fig 6: Source code of the phishing URL page Once the login information has been entered by the user, the form will post the user’s credential details to the compromised domain that is operated by the cybercriminals. Fig 7: Captured data traffic that has been sent to the attacker’s site CASE 2: In this method, attackers send the spam email with an attached HTML file that looks like a voice message. Once the user clicks the HTML file, it will redirect to the phishing page hosted using the Azure domain. Fig 8: Spam mail with double extension method Fig 9: Outlook login phishing page redirected from voice message In this phishing campaign, the attackers have injected obfuscated JavaScript to validate the user credentials that are present in their database to avoid duplication. Fig 10: Obfuscated JavaScript to validate user credentials to avoid duplication The following figure depicts the deobfuscated JavaScript. This code will validate the user’s credential details and sent it to the attacker’s server (hxxps://validr2vtap2l3eh544kb(.)azurewebsites(.)net/v20(.)php). Fig 11: Deobfuscated JavaScript Fig 12: User data will be sent to the attacker’s site using the function getValidatorURL(). In addition to the Outlook phishing campaigns, we have seen phishing campaigns associated with these Azure domains: Microsoft Phishing, OneDrive Phishing, Adobe Document Phishing, Blockchain Phishing, and more. The following figure shows the different phishing campaigns that are hosted using the Azure domain (Windows.net). Fig 13: Microsoft login phishing page Fig 14: Adobe login phishing page Fig 15: Blockchain login phishing page Fig 16: OneDrive login phishing page CONCLUSION The Zscaler cloud blocked more than 2,000 phishing attacks over six weeks that were hosted using the Azure domain (Windows.net). The following diagram represents the various kinds of phishing campaigns that were blocked by the Zscaler cloud. Fig 17: Detected phishing hits Fig 18: The Zscaler Zulu URL Risk Analyzer score for one of the phishing URLs IOCS 039282fsd(.)z19(.)web(.)core(.)windows(.)net 3652adua38ea(.)z5(.)web(.)core(.)windows(.)net 378468459jjn(.)z19(.)web(.)core(.)windows(.)net 623623626638885047749469(.)z19(.)web(.)core(.)windows(.)net 86hoi2a8j592hf2(.)z14(.)web(.)core(.)windows(.)net accounhostoutlook(.)z35(.)web(.)core(.)windows(.)net accountsupdate(.)z22(.)web(.)core(.)windows(.)net adobe111(.)z19(.)web(.)core(.)windows(.)net appriver(.)z19(.)web(.)core(.)windows(.)net azaman(.)blob(.)core(.)windows(.)net bchwalletblockchain(.)z13(.)web(.)core(.)windows(.)net bitcoinwalletrecovery(.)z13(.)web(.)core(.)windows(.)net blockchainofficesupport(.)z13(.)web(.)core(.)windows(.)net blockchainrecoverywalet(.)z13(.)web(.)core(.)windows(.)net blockchaintradindinvest(.)z13(.)web(.)core(.)windows(.)net businessdrivefilesharing(.)z33(.)web(.)core(.)windows(.)net dlgeus(.)blob(.)core(.)windows(.)net 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sams2948818388301(.)z13(.)web(.)core(.)windows(.)net secureofficeportal(.)z19(.)web(.)core(.)windows(.)net sharepo7(.)z22(.)web(.)core(.)windows(.)net sharepointewk8xpzoywq7j(.)z19(.)web(.)core(.)windows(.)net supportoffices365(.)z33(.)web(.)core(.)windows(.)net thursday(.)z19(.)web(.)core(.)windows(.)net ttsokaejqumuamreio(.)z6(.)web(.)core(.)windows(.)net under12(.)z19(.)web(.)core(.)windows(.)net user111777999973sdxc(.)z11(.)web(.)core(.)windows(.)net user37377377733(.)z22(.)web(.)core(.)windows(.)net user7779793e792782(.)z14(.)web(.)core(.)windows(.)net user8877773737(.)z11(.)web(.)core(.)windows(.)net usernamewebmailsingin(.)z14(.)web(.)core(.)windows(.)net v83oybtn5zp5mmz(.)z14(.)web(.)core(.)windows(.)net validatnec39cclzg5l591f(.)z19(.)web(.)core(.)windows(.)net voice88(.)z19(.)web(.)core(.)windows(.)net voicserel00ukeluklwkoxl(.)z13(.)web(.)core(.)windows(.)net webusermicr0softtonlinee(.)z33(.)web(.)core(.)windows(.)net were12(.)z19(.)web(.)core(.)windows(.)net 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