July 16, 2020 By Jeremy Goldstein 5 min read


What is an insider threat? Insider threats are users with legitimate access to company assets who use that access, whether maliciously or unintentionally, to cause harm to the business. Insider threats aren’t necessarily current employees. They can also be former employees, contractors or partners who have access to an organization’s systems or sensitive information.

With 40% of insider incidents involving an employee with privileged access to company assets, organizations need to scrutinize the threats walking through their door every day with as much rigor as they show when securing the perimeter from external attackers.

Why Are Insider Attacks So Dangerous?

In a 2019 SANS report on advanced threats, security practitioners identified major gaps in insider threat defense driven by a lack of visibility into a baseline of normal user behavior as well as the management of privileged user accounts, which represent a more attractive target for cases of phishing or credential compromise.

Insider threat detection is no easy task for security teams. The insider already has legitimate access to the organization’s information and assets and distinguishing between a user’s normal activity and potentially anomalous activity is a challenge. Insiders typically know where the sensitive data lives within the organization and often have elevated levels of access.

As a result, a data breach caused by an insider is significantly more costly for organizations than one caused by an external attacker. In the Ponemon Institute’s 2020 Cost of Insider Threats study, researchers observed that the global average cost of an insider threat was $11.45 million, while the average cost of a data breach over the same period was $3.86 million.

Learn more about the role access level plays in insider attacks with the 2021 IBM Security X-Force Insider Threat Report

4 Types of Insider Threats

While the term insider threat has somewhat been co-opted to describe strictly malicious behavior, there is a defined spectrum of insider threats. Not all insiders are alike and vary greatly in motivation, awareness, access level and intent.

With each type of threat, there are different technical and nontechnical controls that organizations can adopt to bolster insider threat detection and prevention. Gartner classifies insider threats into four categories: pawn, goof, collaborator and lone wolf.

Pawn

Pawns are employees who are manipulated into performing malicious activities, often unintentionally, through spear phishing or social engineering. Whether it’s a negligent employee downloading malware to their workstation or a user disclosing credentials to a third party pretending to be a help desk employee, this vector is one of the broader targets for attackers seeking to cause harm to the organization.

One example involved Ubiquiti Networks, which was a victim of a spear-phishing attack in which emails from senior executives directed employees to transfer $40 million to a subsidiary’s bank account. The employees were unaware at the time that the emails were spoofed and the bank account was controlled by fraudsters.

Goof

Goofs do not act with malicious intent but take deliberately and potentially harmful actions. Goofs are ignorant or arrogant users who believe they are exempt from security policies, whether it be out of convenience or incompetence. Ninety-five percent of organizations have employees who are actively trying to bypass security controls and almost 90 percent of insider incidents are caused by goofs. An example of a goof could be a user who stores unencrypted personally identifiable information (PII) in a cloud storage account for easy access on their devices, despite knowing that to be against security policy.

Collaborator

Collaborators are users who cooperate with a third party, oftentimes competitors and nation-states, to use their access in a way that intentionally causes harm to the organization. Collaborators typically use their access to steal intellectual property and customer information or to cause disruption to normal business operations.

An example of a collaborator is Greg Chung, a Chinese national and former employee at Boeing who hoarded documents relating to the space shuttle program to send them back to China. Corporate espionage is also prevalent with collaborators as in the case of Uber and Waymo. Uber hired a Waymo engineer who was in possession of confidential and proprietary self-driving car technology and allegedly used it on their self-driving car project.

Lone Wolf

Lone wolves are entirely independent, malicious insiders who act without external influence or manipulation. Lone wolves are especially dangerous when they have elevated levels of privilege, such as system administrators or DB admins. A classic example of a lone wolf is Edward Snowden, who used his access to classified systems to leak information relating to cyber espionage at the NSA.

How to Fight Insider Threats: Creating a Detection Plan

To effectively detect insider threats, organizations should first close visibility gaps by aggregating security data into a centralized monitoring solution whether that be a security information and event management (SIEM) platform or standalone user and entity behavior analytics (UEBA) solution. In an analysis of suspected insider threats from 2018 to 2020 by IBM Security X-Force, researchers found 40% of incidents were detected through alerts generated via an internet monitoring tool. Many teams begin with access, authentication and account change logs then broaden the scope to additional data sources such as virtual private network (VPN) and endpoint logs as insider threat use cases mature.

Once the information has been centralized, user behavior can be modeled and assigned risk scores tied to specific risky events, such as user geography changes or downloading to removable media. With enough historical data, a baseline of normal behavior can be created for each individual user. This baseline indicates the normal operating state of a user or machine so that deviations in this activity can be flagged as abnormal. Deviations should be tracked not only for a specific user but also compared to other users in the same location, with the same job title or job function.

Behavioral anomalies help cybersecurity teams identify when a user has become a malicious insider or if their credentials have been compromised by an external attacker. Assigning security risk scores also gives security operations center (SOC) teams the ability to monitor risk across the enterprise whether it be creating watch lists or highlighting the top risky users in their organization. By adopting a user-focused view, security teams can quickly spot insider threat activity and manage user risk from a centralized location instead of manually piecing disparate data points that individually may not show the full picture.

Closing the Loop with Remediation

As mentioned, privileged accounts represent high-value targets for insiders. It is important for organizations to adopt a privileged access management (PAM) solution and feed data about access to privileged accounts from that solution into their SIEM. User behavioral analytics can detect things such as abnormal login attempts, or multiple failed password attempts and generate an alert where appropriate for the analyst to validate.

Once validated, an insider threat incident could be created in an integrated Security Orchestration, Automation and Response (SOAR) system, where the playbook can specify what remediation is needed. Potential remediation could include challenging the insider with MFA, or revoking access, either of which can be done automatically in the IAM solution.

Applying Zero Trust to Address Rising Insider Threats

There are several types of insider threats that organizations should be aware of and each presents different symptoms for security teams to diagnose. By understanding the motivations of attackers, security teams can be more proactive in their approach to insider threat defense.

Taking a zero trust approach can also help organizations proactively manage insider threats. Zero trust starts with the assumption that your organization is compromised and you need to continually validate connections between every user, device, application and dataset.

Especially in a world where many employees work remotely and organizations operate in hybrid cloud environments – both of which increase the risk and scope of insider threats – securing the whole enterprise with zero trust is critical to preventing business disruption. A zero trust approach continually verifies users and can help reduce exposure in the event of a data breach. Zero trust can help isolate threats, proactively detect exploits and ultimately protect users and resources in the face of insider threats.

Learn more about putting zero trust into action to proactively manage insider threats

This blog was updated in reaction to the July 2020 “coordinated social engineering attack” against Twitter to include information on prevention and remediation in the wake of insider threats, and then again in July 2021 to reflect current data on insider threats.

More from CISO

Empowering cybersecurity leadership: Strategies for effective Board engagement

4 min read - With the increased regulation surrounding cyberattacks, more and more executives are seeing these attacks for what they are - serious threats to business operations, profitability and business survivability. But what about the Board of Directors? Are they getting all the information they need? Are they aware of your organization’s cybersecurity initiatives? Do they understand why those initiatives matter? Maybe not. According to Harvard Business Review, only 47% of board members regularly engage with their CISO. There appears to be a…

The evolution of 20 years of cybersecurity awareness

3 min read - Since 2004, the White House and Congress have designated October National Cybersecurity Awareness Month. This year marks the 20th anniversary of this effort to raise awareness about the importance of cybersecurity and online safety. How have cybersecurity and malware evolved over the last two decades? What types of threat management tools surfaced and when? The Cybersecurity Awareness Month themes over the years give us a clue. 2004 - 2009: Inaugural year and beyond This early period emphasized general cybersecurity hygiene,…

C-suite weighs in on generative AI and security

3 min read - Generative AI (GenAI) is poised to deliver significant benefits to enterprises and their ability to readily respond to and effectively defend against cyber threats. But AI that is not itself secured may introduce a whole new set of threats to businesses. Today IBM’s Institute for Business Value published “The CEO's guide to generative AI: Cybersecurity," part of a larger series providing guidance for senior leaders planning to adopt generative AI models and tools. The materials highlight key considerations for CEOs…

Bringing threat intelligence and adversary insights to the forefront: X-Force Research Hub

3 min read - Today defenders are dealing with both a threat landscape that’s constantly changing and attacks that have stood the test of time. Innovation and best practices co-exist in the criminal world, and one mustn’t distract us from the other. IBM X-Force is continuously observing new attack vectors and novel malware in the wild, as adversaries seek to evade detection innovations. But we also know that tried and true tactics — from phishing and exploiting known vulnerabilities to using compromised credentials and…

Topic updates

Get email updates and stay ahead of the latest threats to the security landscape, thought leadership and research.
Subscribe today