// RESOURCE GUIDE · UPDATED 2026-09-13

How to Tell if Your Business Has Been Hacked

Warning signs of a possible business cybersecurity incident and practical first-response steps for Upper Peninsula organizations.

By GlobalTSS · Educational information only; requirements and risks vary by organization.

01 // How to Tell if Your Business Has Been Hacked

Cyberattacks on small businesses frequently go undetected for a long time. By the time you notice something is wrong, attackers may have been inside your systems for months. Knowing the warning signs can mean the difference between catching an intrusion early and discovering it after serious damage is done.

Warning Signs to Watch For

  • Computers running slower than usual for no clear reason — this can indicate malware running in the background
  • Unusual account activity — logins from unfamiliar locations or times, password reset emails you didn't request
  • Unexpected software or programs you don't recognize installed on computers
  • Antivirus or security tools that have been disabled — attackers often disable security software first
  • Files that have been modified, renamed, or encrypted without explanation
  • Unusual outbound network traffic, especially at odd hours
  • Contacts reporting they received suspicious emails from your address
  • Browser redirects to unexpected websites

What to Do If You Suspect a Breach

  • Disconnect affected computers from the network immediately — do not turn them off
  • Do not attempt to clean up the infection yourself — you may destroy evidence needed for recovery
  • Call your IT provider or a cybersecurity professional immediately
  • Document everything you noticed and when you noticed it
  • Notify your cyber insurance provider if you have a policy
  • Do not pay any ransom demands without professional guidance

If you're in the UP and suspect something is wrong with your systems, call GlobalTSS immediately at (906) 662-4481. We can assess the situation remotely or on-site same day.

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