This week, the cybersecurity team at a leading European bank are hard at work repelling no fewer than four hacking attempts. Each team of hackers wormed their way past the bank’s security using a different method, gaining their initial entry on a different day and with different intentions. Can you work out which hackers sneaked past the cybersecurity when the CEO clicked on a dodgy website? Once you've cracked it, email the answer to puzzle@efinancialnews.com by midday on Thursday, 19 May with the answer. CLUES BELOW

CLUES