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Aon  |  Professional Services Practice
In deep water: phishing risks for professional services firms – executive summary

Release Date: May 2021

Ransomware is a leading risk for professional service firms in 2021 – Aon’s Cyber Solutions Group statistics show that ransomware attacks have increased 486% in two years.

  • Attackers are very sophisticated
    • They employ behavioral psychologists
    • They employ professional translators
    • They do their research and know:
      • You (they have your name, email address, and photograph)
      • Your clients
      • Your expertise, experience, and specialty
      • Personal information shared on social media (from where you live, to your dog’s name, including information leaked on the dark web, including SSN’s)
      • Your colleagues
      • Your position in your organization – who you report to and who reports to you
      • Your vacation schedule and where you go
  • Attackers have all the information they need to
    • Craft convincing messages
    • Impersonate you to someone else (e.g., a client)
    • Impersonate one of your clients or vendors to you
    • Convincingly emulate a prospective client
  • The pandemic and subsequent shift to remote working environments has given the attackers new opportunities to exploit issues with carefully crafted messages
  • Statistically, attackers need to send only 20 messages to have a high chance that at least one person will click a link or open an attachment, potentially releasing malware into your systems
  • You and your employees are the “gatekeepers”
    • When they get past you, everything else is technology and they are very, very good at technology
    • The attackers only need to be lucky once
    • Your best defense is training the gatekeepers, often and repetitively

What can you do?


  • Be vigilant – look out for spoofed emails and names that are not quite right
  • Think twice before opening documents or clicking on links
  • Double-check changed instructions using “out of band” communication with parties to a transaction
  • If you think you have a problem, tell someone – the sooner the better
  • Establish and follow protocols – changes and exceptions are always red flags