Insider Threat Awareness Student Guide
February 2024 Center for Development of Security Excellence Page 2-9
likely to engage in risky behavior. Previous rule violaons and social network risks are also known
predisposions of those who may pose an insider threat.
Going back to the cases of Nidal Hasan and Aaron Alexis, there were several potenal predisposing
factors that may have contributed to each of their decisions to carry out their aacks. Hasan
reportedly expressed radical and extremist beliefs, including support for violent acts. He expressed
dissasfacon with his deployment to Iraq and was reportedly harassed by coworkers for his faith.
Alexis reportedly had a history of mental health issues, including paranoid delusions and hearing
voices. He also had a prior arrest for discharging a rearm in public. While the specic predisposing
factors are dierent, they may have made them more suscepble to carrying out a violent act.
Stressors
Another risk factor that may contribute to insider threat is stressors. These are events or situaons
that cause an individual to feel pressure or anxiety and may lead them to act out in ways they
normally wouldn’t. Common stressors include personal, professional, or nancial problems.
In the cases of Nidal Hasan and Aaron Alexis, each experienced several stressors. Hasan reportedly
expressed dissasfacon with his job and was disciplined for performance issues. He also faced
personal stressors and reportedly was in the process of geng divorced. Alexis reportedly had
signicant debts. He also reported feeling isolated and unsupported by his colleagues. These
stressors may have made each more suscepble to carrying out their aacks.
Concerning Behavior
Finally, concerning behavior is a potenal insider threat indicator. Concerning behaviors are
observable behaviors or acons that suggest an individual may be planning or carrying out a
malicious act. Concerning behaviors can be categorized by interpersonal behaviors such as
arguments or altercaons, technical behaviors such as conducng unauthorized computer searches,
security behaviors such as failing to follow procedures, and nancial behaviors such as unexplained
large purchases.
Both Hasan and Alexis displayed concerning behaviors that may have indicated their intenons. Prior
to the aack on Fort Hood, Hasan communicated with an operave from a terrorist organizaon. He
researched ways to kill large numbers of people. He also displayed errac behavior, such as giving
away his possessions and preparing his apartment for his departure. Aaron Alexis also displayed
several concerning behaviors before carrying out the aack on the Navy Yard. He complained he was
being followed by people who were sending vibraons into his body. He was involved in altercaons
with several people. Two days before the aack, he pracced shoong at a gun range. Taken
together, the concerning behaviors of both Hasan and Alexis suggest they were each experiencing
signicant issues and were exhibing signs of increased risk for potenal violence.
Problematic Organizational Response
Finally, problemac organizaonal response is a potenal insider threat indicator. Inadequate
organizaonal responses can escalate the acons of at-risk employees who are more likely to plan
and execute aacks. Examples of problemac organizaonal responses include inaenon, not