Remove malware step 10 -- Hash suspect files

Hash suspect files using HashCalc or similar tool and compare your results to known good copies off of installation media or a known clean system.

Remove malware step-by-step

  Introduction
  Step 1: Use several tools
  Step 2: Try free tools
  Step 3: Check obvious places
  Step 4: Dig deeper
  Step 5: Unload infected software
  Step 6: Disable system restore, reboot in safe mode
  Step 7: Check for software corruption or hardware problem
  Step 8: Don't rely solely on a search engine
  Step 9: Check for vendor-specific removal tools
  Step 10: Hash suspect files
  Step 11: When in doubt, reload
  Step 12: Create a formal security incident response plan

About the author
Kevin Beaver is an independent information security consultant, author, and speaker with Atlanta-based Principle Logic, LLC. He has more than 18 years of experience in IT and specializes in performing information security assessments. Kevin has written five books including Hacking For Dummies (Wiley), Hacking Wireless Networks For Dummies, and The Practical Guide to HIPAA Privacy and Security Compliance (Auerbach). He can be reached at kbeaver @ principlelogic.com.

This tip originally appeared on SearchWindowsSecurity.com.