Today we will teach you how to prevent phishing in G Suite and Microsoft Office 365. Security threats are among the most alarming concerns for IT professionals and C-level executives alike. In one major security breach, a company can literally be taken out of business, depending on the nature of the breach and the data that was exposed. There are many different types of security vulnerabilities and concerns that organizations today need to be aware of, however, some of the most successful types of compromising techniques used by threat actors are often the most basic and traditional methods that have been used for years.
One of these is phishing. Phishing is a technique used by threat actors to lure end-users into disclosing valuable or sensitive information under false pretenses. There are various types of phishing attacks that are used today that organizations need to be aware of. Is phishing still a concern when organizations are making use of public cloud resources such as Google G Suite or Microsoft Office 365? In this post, we will take a look at the various types of phishing attacks, how they have evolved, and how organizations can prevent phishing attacks in G Suite and Office 365.
Table of Contents
Types of Phishing Attacks Used Today
Before exploring the topic of phishing attacks and how they relate to the public cloud, let’s take a look at traditional phishing attacks in general terms including differentiating between the various types of phishing attacks that are commonly used. When it comes to phishing, there are different types of techniques attackers use to steal information. These include the following:
- Bulk Phishing
- Spear Phishing
- CEO Fraud
- URL Phishing and Misspelled Domains
- Filter Evasion
While not an extensive list of phishing types, these are some of the most commonly used. Additionally, new and advanced techniques are introduced into the wild on a regular basis. Let’s take a look in a bit more detail at the above type of attacks and why they are dangerous for organizations.
Bulk phishing is the age-old technique that threat actors use to blast out perhaps millions of phishing emails in bulk that while not specific to the end-user, find success in the sheer volume of emails sent. Bulk phishing emails may entice users to click links with the purpose of harvesting personal information or system information under the guise of a legitimate purpose. However, the unsuspecting end-user is unwittingly handing over login or other sensitive information to an attacker.
With Spear Phishing the message that is seen by the end-user is much more personalized. This helps with the façade of legitimacy. The attacker may have already harvested or obtained personal information about the end-user which is then used in the spear-phishing attack. They may have the end user’s name, phone number, address, or other personal information that makes the additional information request appear legitimate or at least create the impression of having a legitimate connection with the requestor.
Whaling is a specific type of phishing attack that is differentiated from the other types of phishing attempts by the target of the phishing attack. Projected targets of whaling include high-ranking or senior executives such as C-level employees. Information requests contained in the whaling attack are more tailored to an executive. Information presented may include subpoena requests, customer complaints, wire transfer requests, or other financial transaction-related requests. An unsuspecting senior executive may be lured into disclosing sensitive system information or other data that is valuable due to the position within the company the individual holds. Often, C-level and other executives have system access that lower-level employees do not have. If attackers can phish system-related or other information tied to high-level executives, the level of compromise can often be much greater.
Another type of highly effective phishing attack on the rise involves impersonating a CEO or other high-ranking executive. However, its intent and purpose are slightly different. Unlike whaling, rather than targeting the C-Level or high-ranking executive, an attacker impersonates the identity of a CEO or other C-Level executive in communicating with a lower-level end user. This is to persuade the unsuspecting end-user to execute unauthorized wire transfers, financial transactions, or make other purchases. This type of phishing attack plays on basic human nature to please those in positions of authority quickly and without question. Unsuspecting end users may quickly want to carry out any request made by someone of this level in the organization which can lead to bypassing the normal scrutiny that may be given to similar requests made by a lower-level employee.
CEO fraud is a growing type of phishing attack that is extremely effective. Attackers generally carry out this type of attack by way of an email. They may scrape the relevant information for C-Level employees from various social media channels to make the request seem as legitimate as possible. Thus, the attacker can combine the various techniques found in spear-phishing and social engineering in this highly effective form of a specialized phishing attack.
URL Phishing and Misspelled Domains
URL phishing is very common method attackers utilize to steal personal information or other valuable system information from unsuspecting end users. URL phishing typically makes use of misspelled domain names that are very close to the real, legitimate domain. Attackers may even make the misspelled domain look very similar to the legitimate site, giving further success to this form of phishing. Many have inadvertently landed on a URL phishing site by accidentally misspelling a character or two when typing in the URL. An unsuspecting end-user may simply attempt to login and click through a URL that has been set up by an attacker that impersonates a familiar website. In this way, they can easily fall victim to entering in information and inadvertently handing sensitive items over to attackers such as accounts, passwords, email addresses, contact information, etc
Since “Anti-Phishing” mechanisms are getting smarter and know keywords to look for in various phishing-type emails, attackers have gotten smarter by using various filter evasion techniques to avoid these types of filters. These include using images that contain embedded phishing text which helps to avoid simple string parsing by anti-phishing filters. This and other filter evasion techniques can prove to be very effective in especially avoiding traditional anti-phishing techniques.
These examples are only a small subset of the overall phishing tools and techniques utilized by today’s attackers. While phishing is fairly archaic compared to other means of system compromise, it is still surprisingly effective in manipulating unsuspecting end users. The above list of phishing techniques is a basic example that has proven to be very effective in compromising end users. How do phishing attacks look in the public cloud? Are they different? What do organizations need to know about phishing dangers in public cloud Software-as-a-Service environments such as Google G Suite or Microsoft Office 365? What techniques are attackers using there? How can organizations protect themselves?
How to Prevent Phishing Attacks in G Suite and Office 365
There is no question that as organizations move more business-critical resources out into public cloud environments such as Google G Suite and Microsoft Office 365, attackers are and have taken notice. In fact, more and more phishing and other attacks have been geared toward public cloud environments. Attackers know that Google, Microsoft, and others are using sophisticated means to help circumvent these types of attacks, so they have continued to modify their techniques to try and counter the defenses. With modern types of phishing, attackers are not after the typical target of the traditional phishing days such as financial transfers. Now, the target is system credentials and administrator credentials if possible. These are far more valuable as they can lead to even greater types of compromise and the stealing of data.
As posted by Forbes, in 2017, a very sophisticated phishing attack was carried out on Gmail users. End users were presented with a legitimate-looking email that directed end users back to a Google web page that prompted the end-users to grant permissions to a third-party application that was actually malicious. After the permissions were granted, the attackers were able to read the contacts, emails, location, and even access files of the compromised users.
Pubic cloud authentication mechanisms for third-party integrations are designed to be user-friendly, easy, and painless to grant access to resources by end-users. However, if end users carelessly grant permissions to third-party applications without really scrutinizing the access being requested, this can lead to major security implications for organizations hosting resources in public cloud Software-as-a-Service solutions such as G Suite and Office 365.
Most of the time, end-users will typically blindly grant permissions without questioning them appropriately. After all, most of us are guilty of this and do well to ask, when was the last time we read through the permissions requested by a cloud application requesting access to resources? It is a bit sobering to think about the implications that malicious third-party applications pose to organizations in regards to data leaks and sensitive data breaches.
Office 365 phishing attacks are getting much more sophisticated and like the G Suite phishing attack mentioned above, attackers are using much more advanced techniques to be able to avoid phishing protection and other anti-malware safeguards in place. Redmond Magazine reported on a sophisticated phishing attack that was carried out where attackers utilized internal systems to Office 365 to be able to infect Office 365 end users with malware. How is this type of attack carried out?
The term coined for this type of attack is “PhishPoint” as the attacker makes use of Microsoft’s own Office 365 SharePoint to carry out the attack. As most realize, Microsoft allows free Office 365 trials to be provisioned for POC and other initiatives with Office 365. Attackers carrying out PhishPoint provision a trial version of Office 365 for which they only need to have an email address. After standing up the trial version of Office 365, the attacker inserts a malicious link into a SharePoint file instead of an email. The attacker then sends an invitation to “collaborate” on the SharePoint file to an unsuspecting end user.
After clicking the link to access the SharePoint file, the browser opens an impersonated copy of a standard access request to a OneDrive file with a hyperlink on this access request that actually links to a malicious URL. The malicious URL is yet another impersonation of an Office 365 login screen that has the sole purpose of harvesting credentials. The link will behave as if the login credentials fail, however, it is simply harvesting the user account and password from the user input.
PhishPoint impersonated Office 365 screens and exploited weaknesses in the built-in Office 365 Phishing protection
Attackers are looking for weaknesses in the defenses that exist in public cloud Software-as-a-Service systems and PhishPoint is a great example of how quickly and effectively these weaknesses can be exploited.
A point for emphasis for organizations utilizing SaaS resources is that Microsoft and other public cloud environments are not immune to skilled attack techniques and weaknesses in defense mechanisms. Often vendors and providers may be looking at traditional threat vectors and utilizing more traditional means of protecting tenants from phishing attacks. This includes traditional scanning of links in email bodies to look for blacklisted or suspicious domains. As demonstrated by the PhishPoint attack, Microsoft is focusing its attention on email threat vectors for phishing and other malware payloads, and SharePoint links and other “Microsoft” resources are not being scrutinized and scanned properly. Since Microsoft’s link scanning method is only going to a certain level and not scrutinizing and scanning the actual files the links are calling, this presents a clear vulnerability that attackers can exploit for compromising credentials.
Public Cloud Phishing Lessons Learned
There are certainly some hard-hitting lessons that organizations need to be aware of when utilizing public cloud Software-as-a-Service environments such as Google G Suite and Microsoft Office 365. First of all, the idea that the public cloud has impenetrable defenses when it comes to phishing and other malware threats is not true. Organizations need to pay due diligence to the threats posed by modern phishing attacks that utilize sophisticated methods outside of the more traditional means of phishing on-premises environments.
Public cloud environments such as G Suite utilize OAuth authentication that provides a seamless experience with granting permissions to third-party applications. It allows granting permissions to third-party applications without having to reenter their user credentials. The tradeoff for this type of convenience is security. End users will all too often blindly grant requested permissions to third-party applications without truly scrutinizing those permissions or questioning the level of permissions being requested. As the Google G Suite phishing exploit demonstrated, this can easily be used by attackers for malicious purposes in harvesting system credentials, gaining access to files, contacts, etc.
The PhishPoint phishing attack on Microsoft’s Office 365 environment demonstrates how public cloud providers have a long way to go when it comes to implementing truly effective phishing and malware defenses. By simply changing the method of delivering a malicious URL via a SharePoint collaboration request, attackers were able to harvest user credentials without being properly stopped by Microsoft’s anti-phishing mechanisms.
A hard lesson learned from only these two examples shows that organizations cannot simply rely on the default native security and protection from phishing and other attacks provided by G Suite or Office 365. They need to bolster security with a solution that allows effectively filtering and protecting their user environment and data.
Intelligent Phishing Detection, Security, and Data Leak Protection
Relying on the native security mechanisms of today’s public cloud environments is simply not enough. Organizations must take the extra step to bolster the security of their user environment and proactively protect their data. How can this be done easily and in a cost-effective manner?
Spinbackup provides the ultimate solution for organizations running business-critical applications in either Google G Suite or Microsoft Office 365 environments. Specifically related to phishing and malware protection, Spinbackup provides the following to organizations housing resources in G Suite and Office 365 public cloud SaaS environments:
- Proactive Monitoring of user behavior.
- Proactive Monitoring of data shared both inside and outside public cloud environment.
- Third-party Apps Control – Spinbackup can block risky third-party applications such as was used in the G Suite phishing attack in 2017 allowing organizations to have much better control over who and what applications access data.
- Ransomware Protection – Spinbackup can proactively monitor ransomware operations and automatically remediate infected files.
- Insider Threat Protection – Monitor risks from within the public cloud.
- Powerful machine learning and AI baselines and constantly monitor behavior, activity, data, backups, etc.
- Enterprise-level Backups – Automatic, versioned backups for G Suite and Office 365 services.
Spinbackup Provides a clean, powerful UI to monitor public cloud Saas Backups and Security
Spinbackup provides an extremely powerful, bolt-on solution that allows organizations to easily provide the backup and security mechanisms needed in G Suite and Office 365 (security coming soon). It provides a single pane of glass view of the critical activities and security-related events that allows having the tools needed for monitoring, securing, and maintaining the integrity of organization data.