This morning I was looking in our database in order to solve a problem with a user registration and I accidentally noticed some users registered with unusual email addresses (temporary mail services, Russian providers and so on...).
I immediately thought about malicious users so I dug into the logs and I found that the registration requests started from an IP address belonging to our company (we have static IP addresses). My first reaction was: «OMG! Russian hackers infiltrated into our systems and started registering new users!»
So, I found the coworker owning the laptop from which the requests were sent and I went to him in order to warn him that someone violated his computer.
And he said: «Ah! Those 7 users? Yeah, I was doing some tests, I registered them. My email address was already registered so I created some new ones».
Really, man? Really? WTF