US-CERT warns users to remain vigilant for malicious cyber activity seeking to capitalize on interest in Hurricane Harvey. Users are advised to exercise caution in handling any email with subject line, attachments, or hyperlinks related to Hurricane Harvey, even if it appears to originate from a trusted source. Fraudulent emails will often contain links or attachments that direct users to phishing or malware-infected websites. Emails requesting donations from duplicitous charitable organizations commonly appear after major natural disasters.