What We Do
How we do it
Resources
SECURITY ADVISORIES
Jul 29, 2021
UPDATE: PetitPotam NTLM Relay Attack
THE THREAT PetitPotam is a variant of the NTLM Relay attack discovered by security researcher Gilles Lionel. It is tracked as an authentication bypass vulnerability in Active Directory (Certificate Services); currently no CVE identifier has been assigned to this vulnerability. Proof of Concept (PoC) code released last week [1] relies on the Encrypting File System Remote (EFSRPC) protocol to…
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 1000+ organizations in 70+ 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
Jul 12, 2021
Tecala and eSentire Partner to Protect Enterprises across APAC from Business-Disrupting Cyber Attacks
Sydney, 12 July, 2021 - Tecala, Australia’s award-winning technology services and IT consulting provider, today announced it has chosen eSentire, the global Authority in Managed Detection and Response (MDR) cybersecurity services, as their exclusive MDR solution provider in Australia and New Zealand. This partnership will enable Tecala to augment its cybersecurity practice and offer enterprises…
Read More
Partners
PARTNER PROGRAM
Partners
Our award-winning partner program offers financial rewards, sales and marketing tools and personalized training. Accelerate your business and grow your revenue by offering our world-class Managed Detection and Response (MDR) services.
Learn about our Partner Program
Resources
Security advisories — Oct 17, 2019

Phishing Campaign using Google Infrastructure

3 min read

The Threat:

A recent Office365 phishing campaign has shown that threat actors are switching tactics to include the use of Google infrastructure. On October 16th, 2019, both eSentire and external sources observed the use of Google storage to host phishing pages [1]. The use of Google infrastructure has been implemented by threat actors in an attempt to bypass standard email protection. Employees and administrators are encouraged to review the phishing examples and recommendations below.

What we’re doing about it:

What you should do about it:

All Employees

Network/Email Administrators

Additional information:

Multiple phishing pages have been identified using storage.googleapis[.]com to host Office 365 credential phishing pages (Figure 1). These attacks are similar to previous phishing campaigns which exploited blob[.]core[.]windows[.]net and azurewebsites[.]net to host phishing pages. Preliminary investigations show that multiple phishing campaigns are employing a similar prefabricated phishing kit (Figure 3).

The October 16th, 2019 observed attacks were delivered through low effort phishing emails (Figure 2). If a user inserts credentials into the phishing page, the credentials are then sent to a credential drop site for storage (Figures 4 & 5).

Multi-factor authentication (MFA) phishing attempts were not identified in this campaign. It should be noted that attacks specifically targeting MFA have been identified in the wild [2]. Despite these instances, employing MFA is still considered a best security practice for prevent account compromise.

For more information on past phishing campaigns, see the eSentire advisories Office 365 Phishing Follow-Up and Hex Encoded Links Point to Phishing Pages on Microsoft Cloud Services [3] [4].

Figure 1: Office 365 credential phishing page[image src="/assets/fig1-v2.png" id="2469" width="500" height="391" class="leftAlone ss-htmleditorfield-file image" title="fig1 v2"]

Figure 2: Phishing Email leading to storage[.]googleapis[.]com credential phishing page
[image src="/assets/fig2-v3.png" id="2470" width="497" height="319" class="leftAlone ss-htmleditorfield-file image" title="fig2 v3"]
Figure 3: Phishing kit HTML
[image src="/assets/fig3-v2.png" id="2471" width="500" height="267" class="leftAlone ss-htmleditorfield-file image" title="fig3 v2"]

Figure 4: Credential Drop Site
[image src="/assets/fig4-v2.png" id="2472" width="444" height="260" class="leftAlone ss-htmleditorfield-file image" title="fig4 v2"]

Figure 5: Example of plain text phished credentials
[image src="/assets/fig5-v2.png" id="2473" width="288" height="349" class="leftAlone ss-htmleditorfield-file image" title="fig5 v2"]

Indicator Type

Indicators of Compromise

Description

URL

https://storage[.]googleapis[.]com/aoffice365-perpession-70360561/index[.]html

Credential Phishing Page

URL

https://storage.googleapis[.]com/inboxvoicenotemsg/realm/recover[.]html

Credential Phishing Page

URL

https://sendapidata[.]com/email-list/finish-unv2[.]php

Credential Drop Site

URL

https://bertelgrenda[.]top/msgoff/azure2019/realm/send[.]php

Credential Drop Site

URL

https://reklas[.]ga/[email protected]/azure2019/

Credential Drop Site

Email Address

[email protected][.]co[.]jp

Sender Address

References:

[1] https://twitter.com/KesaGataMe0/status/1184354076131151872

[2] https://info.publicintelligence.net/FBI-CircumventingMultiFactorAuthentication.pdf

[3] https://www.esentire.com/security-advisories/office-365-phishing-follow-up/

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