What We Do
How we do it
Resources
TRU INTELLIGENCE CENTER
Our Threat Response Unit (TRU) publishes security advisories, blogs, reports, industry publications and webinars based on its original research and the insights driven through proactive threat hunts.
View Threat Intelligence Resources →
SECURITY ADVISORIES
Jan 19, 2023
Increased Activity in Google Ads Distributing Information Stealers
THE THREAT On January 18th, 2023, eSentire Threat Intelligence identified multiple reports, both externally and internally, containing information on an ongoing increase in Google advertisements…
Read More
View all Advisories →
Company
ABOUT ESENTIRE
About Us
eSentire is The Authority in Managed Detection and Response Services, protecting the critical data and applications of 1500+ organizations in 80+ countries from known and unknown cyber threats. Founded in 2001, the company’s mission is to hunt, investigate and stop cyber threats before they become business disrupting events.
Read about how we got here
Leadership Work at eSentire
LATEST PRESS RELEASE
Dec 13, 2022
eSentire Named First Managed Detection and Response Partner by Global Insurance Provider Coalition
Waterloo, ON – December 13, 2022 – eSentire, Inc., the Authority in Managed Detection and Response (MDR), today announced it has been named the first global MDR partner by Coalition, the world’s first Active Insurance provider designed to prevent digital risk before it strikes. Like Coalition, eSentire is committed to putting their customers’ businesses ahead of disruption by improving their…
Read More
Partners
PARTNER PROGRAM
e3 Ecosystem
We provide sophisticated cybersecurity solutions for Managed Security Service Providers (MSSPs), Managed Service Providers (MSPs), and Value-Added Resellers (VARs). Find out why you should partner with eSentire, the Authority in Managed Detection and Response, today.
Learn more
ECOSYSTEM PARTNER RESOURCES
Apply to become an e3 ecosystem partner with eSentire, the Authority in Managed Detection and Response.
Login to the Partner Portal for resources and content for current partners.
Search
Resources
Security advisories — Aug 22, 2019

Office 365 Phishing Follow-Up

2 minutes read
Speak With A Security Expert Now

The Threat

The eSentire Threat Intelligence team continues to observe various Microsoft themed phishing emails leveraging cloud services to host Office 365 credential phishing pages [1].

Due to the convincing nature of these phishing emails, end-users are encouraged to increase their awareness of this threat. Network administrators are encouraged to review the recommendations below and ensure email controls are effective.

What we're doing about it

What you should do about it

Users

Network/Email Administrators

eSentire has observed consistent use of blob[.]core[.]windows[.]net or azurewebsites[.]net to host phishing links, and recommends the following:

If these domains are used legitimately and cannot be blocked, ensure staff are aware of the risk and verify sender addresses before opening links or attachments

Additional information

Emails observed over the last month have generally been Microsoft themed. When combined with the use of Microsoft links, the authenticity of the email can be difficult to ascertain.

Observed lures in this campaign include fake PowerPoint presentations (Figure 1), Office 365 forwarding alerts (Figure 2), Office 365 email quarantine (Figure 3), and Microsoft Excel pages (Figure 4).

Appendix:

Figure 1: PowerPoint lure, clicking open or “Roadmap for Q4’19” leads to a blob[.]core[.]windows[.]net Office 365 phishing page.

[image src="/assets/f1b2d16511/fig1.png" id="2390" width="404" height="330" class="leftAlone ss-htmleditorfield-file image" title="fig1"]

Figure 2: Forwarding/redirect rule lure. If “Investigate” is clicked, the users is directed to a blob[.]core[.]windows[.]net Office 365 phishing page.

[image src="/assets/fe58b08860/fig2-v2.png" id="2391" width="482" height="263" class="leftAlone ss-htmleditorfield-file image" title="fig2 v2"]

Figure 3: Office 365 email quarantine lure. If “Review Here” is clicked, the user is directed to a blob[.]core[.]windows[.]net Office 365 phishing page.

[image src="/assets/158c0b2b77/fig3.png" id="2392" width="531" height="345" class="leftAlone ss-htmleditorfield-file image" title="fig3"]

Figure 4: Microsoft Excel Lure. When the user clicks on either “To Open” or “Bonus 2010 form.xls” they are redirected to a credential phishing page hosted on blob[.]core[.]windows[.]net.

[image src="/assets/ca8f8a3c16/fig4.png" id="2393" width="562" height="308" class="leftAlone ss-htmleditorfield-file image" title="fig4"]

Figure 5: Transport Rule example

[image src="/assets/14612aae21/fig5.png" id="2394" width="551" height="608" class="leftAlone ss-htmleditorfield-file image" title="fig5"]

References:

[1] https://www.esentire.com/security-advisories/hex-encoded-links-point-to-phishing-pages-on-microsoft-cloud-services/

View Most Recent Blogs