As a business owner, recognizing the early warning signs of a cybersecurity attack can make the difference between a minor inconvenience and a major data breach and financial disaster. At IT Colorado, we often hear from clients who didn’t realize they were under attack until significant damage was already done. Here are some examples of situations we have found that have been overlooked key warning signs so you can catch problems early.
1. Computers Running Unusually Slowly
When your normally quick computer starts crawling along, it might need more than a restart. Malware often consumes system resources while running in the background.
What to look for:
- Programs taking much longer to open than usual
- Simple tasks (like saving files) becoming frustratingly slow
- Your computer fan running loudly even when you’re not doing anything intensive
- System slowdowns that persist even after restarting
What to do: Check which processes are running using Task Manager (Windows) or Activity Monitor (Mac). Look for unfamiliar programs using large amounts of CPU or memory. If you can’t identify what’s causing the slowdown, it’s time to consult an IT professional.
2. Strange Pop-up Messages
Unusual pop-ups can indicate adware, malware, or even ransomware has infected your system.
What to look for:
- Pop-ups appearing when you’re not in a web browser
- Messages claiming your computer is infected and you need to call a number or download “security software”
- Alerts about encrypting your files or demands for payment
- Advertisements that seem targeted based on private conversations (indicating possible spyware)
What to do: Don’t click on these pop-ups or follow their instructions. Instead, disconnect from the internet immediately and run a legitimate antivirus scan. If you see ransomware messages, contact an IT security professional immediately.
3. Programs Starting or Closing on Their Own
When programs start without your input or close unexpectedly, it often means something (or someone) else is controlling your computer.
What to look for:
- Your cursor moving on its own
- Applications launching that you didn’t open
- Programs closing suddenly while you’re using them
- Unexplained changes to system settings
- Your webcam light activating without your permission
What to do: If you notice these signs, immediately disconnect your computer from the internet (unplug the ethernet cable or turn off Wi-Fi). This might prevent further damage or data theft. Then contact IT support.
4. Unusual Account Activity
Strange account activity is often the first sign that someone has gained unauthorized access to your systems.
What to look for:
- Logins at unusual hours (like 3 AM when no employees are working)
- Logins from unfamiliar locations or countries
- Password reset emails you didn’t request
- New user accounts you didn’t create
- Missing or altered files
- Unauthorized transactions or changes to financial information
- Being locked out of your own accounts
What to do: Immediately change passwords for affected accounts using a different, secure device. Enable two-factor authentication if it’s not already active. Review account permissions and disable any suspicious users.
5. Customers Reporting Strange Emails “From Your Company”
If customers contact you about weird emails supposedly from your business, it could mean hackers have either compromised your email systems or are impersonating your company.
What to look for:
- Customers reporting emails asking for payment to new bank accounts
- Reports of emails with suspicious attachments or links
- Messages with poor grammar or spelling (unlike your normal communications)
- Emails sent from addresses that look similar to yours but aren’t exactly right (like support@itc0lorado.com instead of support@itcolorado.com)
What to do: Alert all customers immediately about the fraudulent emails. Have them forward suspicious messages to you without opening attachments. Check your email sending logs to determine if the breach is in your systems or if someone is simply impersonating you.
6. Missing Files or New Files You Don’t Recognize
Disappearing files or mysterious new ones can indicate ransomware, data theft, or other malware.
What to look for:
- Important documents that have disappeared
- Files with strange extensions (like .encrypted, .locked, .crypto)
- Text files with ransom instructions
- New files with random names or unfamiliar formats
What to do: If you suspect ransomware, immediately disconnect the affected computer from your network to prevent spread. Don’t delete mysterious files before consulting an expert, we have found that they often contain clues about the attack.
7. Disabled Security Tools
Many modern malware variants try to disable your antivirus and other security tools first.
What to look for:
- Antivirus software that won’t open or has stopped running
- Security warnings that your protection is turned off
- Inability to visit security websites or download security updates
What to do: Try to restart your security software. If you can’t, boot your computer in safe mode and then attempt to run your security tools. If that fails, you’ll need expert help to clean the system.
8. Unexpected Network Traffic
Unusual amounts of network activity, especially when you’re not actively using the internet, could indicate data being stolen or your systems communicating with hackers’ servers.
What to look for:
- Internet connection running slowly despite few active users
- Network activity lights blinking rapidly when you’re not using the internet
- Data usage reports showing unexpected increases
What to do: Check your router logs if possible. Consider using network monitoring tools that can alert you to unusual patterns. In the meantime, critical systems might need to be temporarily disconnected.
9. Redirected Web Searches
If your web searches take you to unfamiliar search engines or unexpected websites, your browser may be compromised.
What to look for:
- Your homepage has changed without your permission
- Searches are redirected to different search engines
- Extra toolbars in your browser that you didn’t install
- New bookmarks you didn’t create
What to do: Check your browser extensions and remove any you don’t recognize. Reset your browser to default settings, and run a complete system scan with reputable antimalware software.
10. Unusual Financial Activity
Unauthorized charges, missing funds, or unexplained invoices often indicate that financial information has been compromised.
What to look for:
- Unexpected charges on company credit cards
- Changes to vendor payment information
- Unusual invoices or receipts
- Employees reporting they haven’t received direct deposits
What to do: Contact your financial institutions immediately to report suspicious activity. Change ALL passwords related to financial accounts using a clean, secure device.
At IT Colorado, we always recommend erring on the side of caution. If something doesn’t seem right with your technology, that’s because it probably isn’t. Don’t wait until small warning signs turn into major problems – reach out to IT professionals who can properly investigate.
Remember: The cost of having an expert check a false alarm is minimal compared to the potential cost of ignoring a real attack.
Visit https://www.itcolorado.com/ or call our team for immediate assistance if you notice any of these warning signs in your business systems. We’re here to help.