Moneybookers (rebranded as Skrill) is a payment facilitator: it processes card payments on behalf of thousands of online businesses. When a charge starts with MB*, Moneybookers handled the payment — but the product came from the brand named after the asterisk.
If you don't recognize a Moneybookers charge, the brand you actually bought from usually appears right after the Moneybookers prefix in the descriptor — search the full descriptor above to identify it.