Bad attachments can contain malware and lead to virus-infected websites. If you think you've opened a malicious attachment, notify your IT department and scan your computer using the most up-to-date version of your antivirus software.

If you've entered your username and password on a fraudulent phishing site, change your password as soon as possible. You may be able to salvage your account by changing your credentials and ensuring two-factor or multi-factor authentication is enabled.

Financial information compromises need even faster response times. Contact your financial institution immediately if you suspect any odd activity or know you produced credentials on a fraudulent site. Place fraud alerts on your credit reports. Dispute any suspicious or unauthorized activity on credit cards and freeze any debit cards associated with the account.