If you had an email that looked like it was from your boss asking how your recent holiday went, would you open it? Most probably - and hackers know it. Read More ..
One group in particular has used this simple technique to devastating effect, using it to spy on some of the world's biggest corporations. But who are they, and what are they looking for?
When security experts looked into some of the highest profile hacks in recent years - one particular criminal group kept on coming to their attention.
The Comment Group, which industry insiders say is based in China, offer hacking for hire - be it for individuals, corporations or governments.
It got its name from what was once its trademark technique - implanting dodgy links to malicious malware within the comments sections of popular websites.
But more recently, the Comment Group has become known for being particularly adept in one other important discipline of hacking: straightforward research.