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Security advisories — Oct 17, 2019

Phishing Campaign using Google Infrastructure

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/