Unveiling the insider threats: Mitigation strategies & case studies

insider threat

Get in touch with Neumetric

Sidebar Conversion Form
Contact me for...


Contact me at...

Mobile Number speeds everything up!

Your information will NEVER be shared outside Neumetric!

Unveiling the insider threats: Mitigation strategies & case studies


An insider threat involves security risks originating from individuals within an organisation who might exploit their authorised system access to intentionally or unintentionally steal or harm data. These threats encompass employees, contractors, partners & approved users who could potentially jeopardise operations through malicious or accidental actions. Insider threats leverage internal knowledge & access, making them highly hazardous, necessitating a nuanced understanding of their motivations, tactics & signs to effectively defend against them.

In today’s data-driven business landscape, insider threats are a critical risk that accounts for about thirty percent (30%) of cyber incidents, causing disproportional financial & reputational harm compared to external attacks. As organisations become more digital, effectively countering insider threats is crucial, as neglect can lead to Intellectual Property [IP] & data theft, fraud, information leaks & system sabotage. Robust insider threat programs are essential for modern cybersecurity to protect critical assets & ensure organisational resilience.

This Journal aims to explore insider threat categories, offer actionable mitigation strategies & share real-case studies. By illuminating insider profiles, motivations, tactics & prevention measures, it educates security leaders on safeguarding organisations. Understanding insider threat psychology, tactics & cases helps organisations tailor defence investments against various insider risks.

Identifying insider threat actors

There are three primary categories of insider threats:

  1. Malicious insiders: These insiders intentionally steal data, sabotage systems or otherwise deliberately cause harm to an organisation. Their motivations stem from revenge, financial incentive, ideology or espionage. They represent active threats who set out to damage the organisation.
  2. Negligent insiders: Also called unintentional insider threats, these employees accidentally expose sensitive data or systems to risk due to oversight, poor training or failure to follow security protocols. While not malicious, their actions can still seriously impact organisations.
  3. Compromised insiders: The credentials of these insiders are compromised through phishing, social engineering or other methods. External threat actors then leverage the accounts & access privileges of compromised insiders to infiltrate systems & data covertly.

Common indicators of insider threat behaviour

Some concerning behaviours that may indicate an insider threat include unusual account activity, accessing unauthorised data, downloading large datasets, disgruntled behaviour towards managers or coworkers, violating security policies & poor cybersecurity habits.

Insider threats may also display stressors in their personal lives, family problems, financial difficulties or mental health issues that motivate riskier behaviour. Isolating concerning patterns among vast user activity data is key.

Understanding motives & triggers

  1. Motivations of insider threat actors

What motivates insider threats to attack organisations? Some common motivations include:

  1. Financial gain: Insiders may steal & sell trade secrets, embezzle money or commit fraud for profit. Financial incentives are a top motive for malicious insiders.
  2. Revenge or disgruntlement: Bitter employees may seek to sabotage systems, destroy data or leak confidential information to harm organisations after termination or reprimand.
  3. Espionage or data theft: Insiders recruited by competitors or nation-states may steal Intellectual Property, data or intelligence to benefit foreign organisations.
  4. Ideological or political reasons: Activist insiders like hacktivists may leak or alter data to further a political agenda or ideology. Terrorist groups also recruit insiders.
  5. Trigger events leading to insider threat incidents

Certain organisational & personal events often act as triggers that precede insider threat activity:

  • Organisational triggers: Layoffs, mergers & acquisitions, policy changes, security crackdowns & introduction of monitoring technology.
  • Personal triggers: Divorce, death in family, financial troubles, drug/alcohol abuse, mental health issues, feelings of exclusion.

Identifying triggers can help organisations forecast & prepare for higher insider threat risk periods. Targeted monitoring & vigilance is critical around known trigger events.

The insider threat lifecycle

  1. The different phases of insider threat activity

Insider threat activity follows a three-phase lifecycle:

  1. Pre-employment phase: Background checks, screening & candidate risk assessment during hiring represents the first line of defence.
  2. Employment phase: Monitoring employees for suspicious activity, policy violations, behavioural changes & other red flags is critical for detection.
  3. Post-employment phase: Responding to threats from recently terminated employees & monitoring former employee activity remains necessary.
  4. Identifying red flags in each lifecycle stage

Organisations should watch for concerning indicators in each phase:

  • Pre-employment red flags: Falsified credentials, criminal history, omitted employment, high-risk personalities.
  • Employment red flags: Unauthorised access attempts, disgruntled social media posts, conflicts with coworkers, policy violations.
  • Post-employment red flags: System sabotage after termination, unauthorised retention of data, malicious social media activity.

Ongoing vigilance & threat intelligence gathering across the insider threat lifecycle is key to timely threat detection & mitigation.

Insider threat mitigation strategies

  1. Implementing insider risk assessments & management: Regular insider threat risk assessments identify & prioritise high-risk users, roles, systems & data based on access & potential impact. These inform tailored controls, monitoring & deterrence measures. Ongoing assessments adapt programs to emerging risks.
  2. Establishing strong access controls & monitoring: Least privilege access, extensive logging, monitoring, data loss prevention, database auditing, network traffic analytics, endpoint controls & unified logging help safeguard assets & detect suspicious access.
  3. Conducting security awareness & training programs: Comprehensive awareness programs teach employees critical skills for insider threat prevention including data protection, social engineering risks, incident reporting & proper cyber hygiene. Role-based training & phishing simulations boost readiness.
  4. Building a culture of trust but verify: Ethical workplace cultures are important but controls like user monitoring, audits & data analytics are still required to detect potentially malicious activity behind the scenes.
  5. Monitoring employee behaviour & anomalous activity: Analytics & machine learning techniques baseline normal behaviour & automatically detect subtle deviations indicative of insider threats for rapid response.

Insider threat detection technologies

  1. User Behavior Analytics [UBA]: User Behaviour Analytics solutions apply machine learning & statistical modelling to establish normal baseline user activity patterns across applications, networks & systems. UBA detects anomalies & outliers indicative of potential insider threats. By analysing areas like logins, data access, downloads, emails & endpoint activity, UBA can recognize staff performing outside their normal roles.
  2. Data Loss Prevention [DLP] solutions: Data Loss Prevention technologies provide deep visibility into data usage, transmission & unusual access attempts across an organisation. DLP systems can automatically monitor, control & secure sensitive data like intellectual property, customer information & financial data to prevent malicious insider exfiltration. DLP alerts security teams to potential data theft.
  3. Endpoint Detection & Response [EDR] tools: Endpoint Detection & Response tools analyse employee device activities in depth to recognize suspicious insider actions like unauthorised USB usage, suspicious downloads or command & control signalling. EDR can automatically block potentially malicious endpoint activities indicative of insider threats.
  4. Security Information & Event Management [SIEM] systems: Security Information & Event Management systems aggregates & correlates log data from across an organisation’s diverse systems & applications to uncover insider threat patterns. Using analytics & threat intelligence, SIEM can connect the dots on suspicious user activities that may fly under the radar when viewed in isolation.

Insider threat prevention best practices

  1. Regular insider risk assessments & audits: Organisations should perform continual insider risk assessments & audits to identify control gaps, detect policy violations, adjust user access as needed & address emerging risks. Assessments should be embedded into organisational processes & supplemented with technical audits.
  2. Creating a comprehensive insider threat policy: A formal insider threat policy should cover risk management, access controls, employee monitoring, training requirements, incident response, post-employment controls, governance, program roles & responsibilities & integration with HR/Legal processes.
  3. Encouraging reporting of suspicious activities: Awareness training & messaging should empower & encourage employees to promptly report suspicious cybersecurity activities, policy violations & concerning insider behaviours through designated channels like insider threat programs & ethics hotlines.
  4. Collaborating with HR & legal departments: Insider threat teams should work closely with HR to improve candidate screening, handle employee relations issues & positively engage disgruntled staff. Coordination with Legal is critical for handling investigations, monitoring regulations & preserving evidence properly.

Insider threat in remote work environments

Remote & hybrid work models introduce new insider threat challenges like less visibility into employee activities outside the office, relaxed perimeter security, increased use of personal devices & an expanded digital attack surface. Geographically distributed teams also have less in-person engagement. Mitigating insider threats for remote/hybrid work requires policies & technologies tailored to the distributed environment:

  • Expanded logging, network monitoring & cloud access controls provide visibility into remote employee actions.
  • Enhanced Virtual Private Network [VPN] controls, Zero Trust Network Access [ZTNA] & device management secure remote access & Bring Your Own Device [BYOD].
  • Extra vigilance around remote onboarding/offboarding, policy compliance & user lifecycle management.
  • User & Entity Behaviour Analytics [UEBA] & DLP tuned to detect remote data exfiltration & account misuse.
  • More focus on training & engagement initiatives to anchor employees to organisational culture.
  • Insider threat programs must partner closely with IT/security teams responsible for the remote infrastructure.

With adjustments to address the distributed workforce, insider threat programs can apply proven strategies to reduce risks introduced by hybrid work arrangements.


This Journal provided an in-depth look at the different categories of insider threats facing modern organisations, their unique motivations & tactics, real-world case examples & both technical & policy mitigation best practices. Insider threats were revealed to be a significant yet overlooked cyber risk that warrant prioritised investment given their potential to cause disproportionate damage through data theft, IP loss, system sabotage & confidential information leakage.

Robust insider threat programs must become essential components of enterprise cybersecurity. By taking a proactive stance on insider risk assessments, access controls, monitoring, training & leveraging leading-edge insider threat detection technologies, organisations can substantially reduce their risk exposure. However, a layered defence combining both organisational & technical measures tailored to address unique risks is key to combating both malicious & unintentional insider threats.

This Journal is aimed to provide security leaders with valuable frameworks, strategies & practices to make informed decisions on insider threat programs that meet their specific risk tolerance & priorities. By dedicating appropriate focus & resources to insider threat mitigation, organisations can protect their critical assets, data, infrastructure & reputation against the significant damages posed by insider incidents.


What are the two types of insider threats?

The two overarching categories of insider threats are malicious insiders & unintentional/negligent insiders. Malicious insiders deliberately steal data, sabotage systems or intentionally harm an organisation for motives like profit, revenge, ideology or espionage. Negligent insiders accidentally expose sensitive information or resources due to factors like oversight, poor training or lack of security awareness.

What are 4 different types of insider attacks?

Four common insider attack tactics are:

  • Theft of sensitive data like IP, customer information, financial records or other confidential digital assets.
  • Leakage of proprietary materials, trade secrets or PR-sensitive information for profit or to harm the organisation.
  • System sabotage to disrupt operations, damage infrastructure or erase data to create destructive effects.
  • Fraud such as embezzlement, financial misreporting or falsification of records for personal financial gain.

What is insider threat example?

A concrete insider threat example is an engineer or developer with access to an organisation’s proprietary source code, who downloads large quantities of source code without authorisation right before resigning to bring to a competitor. This type of data theft can provide huge advantages to competitors & cause major losses & trust issues for the original organisation.

Sidebar Conversion Form
Contact me for...


Contact me at...

Mobile Number speeds everything up!

Your information will NEVER be shared outside Neumetric!

Recent Posts

Sidebar Conversion Form
Contact me for...


Contact me at...

Mobile Number speeds everything up!

Your information will NEVER be shared outside Neumetric!