Reporter Joe Tidy was offered money if he would help cyber criminals access BBC systems.

Like many things in the shadowy world of cyber-crime, an insider threat is something very few people have experience of.

Even fewer people want to talk about it.

But I was given a unique and worrying experience of how hackers can leverage insiders when I myself was recently propositioned by a criminal gang.

"If you are interested, we can offer you 15% of any ransom payment if you give us access to your PC."

That was the message I received out of the blue from someone called Syndicate who pinged me in July on the encrypted chat app Signal.

I had no idea who this person was but instantly knew what it was about.

I was being offered a portion of a potentially large amount of money if I helped cyber criminals access BBC systems through my laptop.

They would steal data or install malicious software and hold my employer to ransom and I would secretly get a cut.

I had heard stories about this kind of thing.

In fact, only a few days before the unsolicited message, news emerged from Brazil that an IT worker there had been arrested for selling his login details to hackers which police say led to the loss of $100m (£74m) for the banking victim.

I decided to play along with Syndicate after taking advice from a senior BBC editor. I was eager to see how criminals make these shady deals with potentially treacherous employees at a time when cyber-attacks around the world are becoming more impactful and disruptive to everyday life.

I told Syn, who had changed their name mid-conversation, that I was potentially interested but needed to know how it works.

They explained that if I gave them my login details and security code then they would hack the BBC and then extort the corporation for a ransom in bitcoin. I would be in line for a portion of that payout.

They upped their offer.

"We aren't sure how much the BBC pays you but what if you took 25% of the final negotiation as we extract 1% of the BBC's total revenue? You wouldn't need to work ever again."

Syn estimated that their team could demand a ransom in the tens of millions if they successfully infiltrated the corporation.

The BBC has not publicly taken a position on whether or not it would pay hackers but advice from the National Crime Agency is not to pay.

Still, the hackers continued their pitch.