Blackhole exploit v3.8.7 PL3

[محروم.كوم]

Hello, new to the site.

I'm advised by the IT security department of my company that a vBulletin forum I administrate has an 'iframe' on the homepage which diverts as the page is loading, to a 'blackhole exploit'.

Nope, I've not got a clue what I'm on about


Questions are: Has anyone else encountered this issue? How did it get there? How do you get rid of it & How do I stop it happening again?

Any feedback very much appreciated. __DEFINE_LIKE_SHARE__