What We Do
How we do it
Resources
SECURITY ADVISORIES
May 11, 2022
CVE-2022-26923 - Active Directory Domain Services Elevation of Privilege Vulnerability
THE THREAT Microsoft has disclosed a new vulnerability impacting Active Directory Certificate Services (ADCS) tracked as CVE-2022-26923 (Active Directory Domain Services Elevation of Privilege Vulnerability). If exploited successfully, an authenticated attacker can escalate privileges in environments where ADCS is running on the domain. eSentire is aware of technical details and tooling [2] for…
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 1200+ organizations in 75+ 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
May 17, 2022
Cybersecurity Leader eSentire Continues Its Commitment to Rigorous Security Standards Earning PCI DSS Certification
Waterloo, ON, May 17, 2022 — eSentire, the Authority in Managed Detection and Response (MDR), maintains one of the most secure and robust IT environments of any MDR provider in the industry. To that end, eSentire today announced that it has received the Payment Card Industry Data Security Standard (PCI DSS) certification, considered one of the most stringent and comprehensive payment card…
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

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