An email lands on a Tuesday morning.
It appears to come from the CEO. The sender name checks out, the wording feels convincing, and even the signature looks legitimate.
"Hey — can you help me with something quickly? I'm tied up in back-to-back meetings. I need you to take care of a vendor payment. I'll fill you in later."
The new hire hesitates.
They've only been with the company for four days. They're still learning the workflow, still getting a feel for what is and isn't typical, and they definitely don't want to be the person who questions the CEO during their first week.
So they help.
And in that moment, the attack succeeds.
Why week one is the highest-risk window
Each spring, companies welcome a fresh round of employees, including recent graduates and summer interns stepping into their first professional roles. For businesses, it's onboarding season. For attackers, it's prime hunting season.
Keepnet Lab's 2025 New Hires Phishing Susceptibility Report found that CEO impersonation emails are 45% more likely to work on new hires than on experienced staff.
Cybercriminals don't usually target your most experienced people first. They focus on the ones still learning how things work, because the early days create a gap where unfamiliarity replaces instinct.
A new employee may not recognize what a normal request looks like. They may not know how the CEO typically communicates. They haven't had time to build confidence or pattern recognition, and attackers exploit that uncertainty.
But here's the real issue: the new hire isn't the weakness. The biggest risk isn't the employee who is careless. It's the one who is trying to be helpful.
If you own a business, you probably already know exactly who on your team would respond first.
The real weakness isn't training. It's the setup.
Think about that employee's first day.
Their laptop wasn't fully ready. Access wasn't complete. Their email account was still being created. They used someone else's login to check one thing quickly. They saved a file on their device because the shared drive wasn't available. They reached for a personal phone to look up a client number because it was faster.
None of it felt dangerous. It felt efficient. It felt like the practical thing to do on a busy first day.
But during that first week, before systems are fully in place, a few silent problems begin to stack up. Shared credentials create untracked accounts, files drift outside backup coverage, personal devices touch company data, and no one has clearly explained what to do when something seems suspicious.
The same Keepnet report also found that new employees are 44% more likely to fall for phishing than tenured staff. That difference doesn't come from recklessness. It comes from disorder. When onboarding is messy, security becomes an afterthought. That's exactly the kind of environment a phishing email is designed to exploit.
The attack didn't invent the weakness. The first day did.
What a secure first day should include
Solving this doesn't mean delivering a long security lecture on day one. It means having three things ready before the new employee ever arrives.
1. Their access is ready, not improvised.
The laptop should be prepared, credentials should be created in advance, and permissions should be clearly defined. No borrowed logins, no temporary workarounds, and no "we'll fix that later this week."
2. They understand what a normal request looks like in your business.
This can be handled in a short 10-minute conversation. Does the CEO ever email about payments? Does anyone? What should they do if something feels unusual? This isn't formal security training; it's basic onboarding guidance.
3. They know exactly where to turn with questions.
The employee who paused before clicking that email might have asked for help if they had known who to ask. Most first-week mistakes happen quietly because new hires don't want to appear inexperienced.
Give them a person. Give them a process.
Most security failures don't happen because someone ignores the rules. They happen because no one taught the rules yet.
Maybe your onboarding is already strong. Maybe your team is small enough that first days feel personal instead of procedural. But if a new hire has ever had to make it up as they go in week one — or if you're planning to add someone this spring — it's worth fixing the process before that Tuesday email shows up.
Click here or give us a call at 714-369-8197 to schedule your free 15-Minute Discovery Call.
And if you know another business owner who is about to hire, send this their way. The best time to shut the door is before anyone gets a chance to walk through it.
