By Kian Mahdavi
Over the past couple of weeks, the Cofense Phishing Defense Center (PDC) has witnessed an increase in phishing campaigns that aim to harvest credentials from innocent email recipients by tricking them into ‘Updating their Office 365’ using a Google Docs Form.
Google Docs is a free web-based application, allowing people to create text documents and input and collect data. It is an enticing way for threat actors to harvest credentials and compromise accounts. Here’s how it works:
Figure 1 – Email Header
The phishing email originates from a compromised financial email account with privileged access to CIM Finance, a legitimate financial services provider. The threat actor used the CIM Finance website to host an array of comprised phishing emails. Since the emails come from a legitimate source, they pass basic email security checks such as DKIM and SPF. As seen from the headers above in figure 1, the email passed both the DKIM authentication check and SPF.
This threat actor set up a staged Microsoft form hosted on Google that provides the authentic SSL certificate to entice end recipients to believe they are being linked to a Microsoft page associated with their company. However, they are instead linked to an external website hosted by Google, such as
Figure 2 – Email Body
The email masquerades as a notification from “IT corporate team,” informing the business user to “update your Office 365” that has supposedly expired. The “administrator” claims immediate action must be taken or the account will be placed on hold. The importance of email access is key to this credential phish, leading users to panic and click on the phishing link, providing their credentials.
Figure 3 – Phishing Page
Upon clicking the link, the end user is presented with a substandard imitation of the Microsoft Office365 login page, as seen in figure 3, that does not follow Microsoft’s visual protocol. Half the words are capitalized, and letters are replaced with asterisks; examples include the word ‘email’ and the word ‘password.’ In addition, when end users type their credentials, they appear in plain text as opposed to asterisks, raising a red flag the login page is not real. Once the user enters credentials, the data is then forwarded to the threat actors via Google Drive.
HOW COFENSE CAN HELP
75% of threats reported to the Cofense Phishing Defense Center are credential phish. Protect the keys to your kingdom—condition end users to be resilient to credential harvesting attacks with Cofense PhishMe through the “Account Security Alert” or “Cloud Login” templates and get visibility of attacks with Cofense Reporter.
Easily consume phishing-specific threat intelligence to proactively defend your organization against evolving threats with Cofense Intelligence. Cofense Intelligence customers received further information about this threat in Active Threat Report (ATR) 36388.
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