Its funny how writing a user login replacement seems kind of ubiquitous for all future hackers. Mine was in Visual Basic (5 iirc) for a Windows (Novell?) network. This was back in school. You could trivially change win.ini to set it up to run _before_ the real login screen. Mine would save the username and password to either a shared network drive or a local file, then display a "password error" and exit to the real login prompt.
What got me in the end was that a "friend" used the same trick and started copying peoples files from their network account to his own. My suspicion is that when he eventually maxed his quota, the system must've warned the network admin... a cursory look would later reveal he copied some teacher's thesis files, and that was a big no no.
Eventually this incident would land me my first computer related job as a junior tech support/network admin.
What got me in the end was that a "friend" used the same trick and started copying peoples files from their network account to his own. My suspicion is that when he eventually maxed his quota, the system must've warned the network admin... a cursory look would later reveal he copied some teacher's thesis files, and that was a big no no.
Eventually this incident would land me my first computer related job as a junior tech support/network admin.