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URL: https://www.zscaler.com/blogs/security-research/abusing-microsofts-azure-domains-host-phishing-attacks
Submission: On July 01 via manual from US — Scanned from DE

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Security Research


ABUSING MICROSOFT’S AZURE DOMAINS TO HOST PHISHING ATTACKS

GAYATHRI ANBALAGAN
July 16, 2019 - 6 min read



Security Insights


Contents

 1. Article
 2. More blogs

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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 dlgneu(.)blob(.)core(.)windows(.)net

dlgweu(.)blob(.)core(.)windows(.)net driveoffice-

secondary(.)z13(.)web(.)core(.)windows(.)net

eastexch030serverdatanet(.)z13(.)web(.)core(.)windows(.)net

edustudioapp(.)z19(.)web(.)core(.)windows(.)net

exchangeonline80293745(.)z27(.)web(.)core(.)windows(.)net

finance51(.)z13(.)web(.)core(.)windows(.)net

fukshawefwe22(.)blob(.)core(.)windows(.)net

fundingmessan(.)z13(.)web(.)core(.)windows(.)net

gry1asdqw1(.)blob(.)core(.)windows(.)net

h0vbkkkeebweybv(.)z33(.)web(.)core(.)windows(.)net

hgnghhghkkdkdh(.)z13(.)web(.)core(.)windows(.)net

hp94549754083400j9302975(.)z21(.)web(.)core(.)windows(.)net

hsdv(.)blob(.)core(.)windows(.)net

linknec39cclzg5l591f(.)z19(.)web(.)core(.)windows(.)net

linkp4klg1qkni76yoz8(.)z19(.)web(.)core(.)windows(.)net

lpdmsonline(.)blob(.)core(.)windows(.)net

macrofinancesoftonline(.)z14(.)web(.)core(.)windows(.)net

macrosoft0nlineoffice365(.)z13(.)web(.)core(.)windows(.)net

mailingofficeupdate(.)z14(.)web(.)core(.)windows(.)net

mailofficemicr0softvalid(.)z35(.)web(.)core(.)windows(.)net

mailofficesecurity(.)z13(.)web(.)core(.)windows(.)net

mailofficeveridiers(.)z33(.)web(.)core(.)windows(.)net

mailoutlookmcrosoftupdat(.)z11(.)web(.)core(.)windows(.)net

mailoutnewsecurity(.)z14(.)web(.)core(.)windows(.)net

mak17opa54vjxu8(.)z7(.)web(.)core(.)windows(.)net

mdj34598720843(.)z10(.)web(.)core(.)windows(.)net

microexchyz42nhszseheys(.)z13(.)web(.)core(.)windows(.)net

micromuze3rlokoyg(.)z14(.)web(.)core(.)windows(.)net

microrel00ukelukleqwkoxl(.)z13(.)web(.)core(.)windows(.)net

microsofbt50xjotm45wm7al(.)z11(.)web(.)core(.)windows(.)net

microsofd8f82gtrjyaajnsj(.)z11(.)web(.)core(.)windows(.)net

microsofdi3o152rpnnt2zr8(.)z11(.)web(.)core(.)windows(.)net

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