Spoofing impersonates trusted users, devices, or services to bypass trust and cause fraud; verify identities with strong authentication and signed messages.
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Background for this topic.
Spoofing is the forging of an identity or origin so a message, connection, website, or phone call appears to come from a trusted source. Attackers may impersonate an executive by email, imitate a domain, falsify caller ID, or place packets with a forged source IP address. The goal can be to induce payment or disclosure, deliver malware, bypass trust checks, or obscure the source of traffic. IP spoofing usually prevents a reply from reaching the attacker, but can support reflection attacks; it is not by itself proof of access to the claimed system.
Mitigation depends on the channel. For email, configure and enforce SPF, DKIM, and DMARC, while treating display names and caller ID as untrusted signals. Use phishing-resistant authentication, verify sensitive requests through an independent channel, and validate domains and certificates before users enter credentials. At network boundaries, apply ingress and egress source-address filtering, monitor anomalous traffic, and design services not to trust a claimed address alone.
Recent weeks have seen a sizable uptick in the number of phishing scams targeting U.S. Postal Service (USPS) customers. Here's a look at an extensive SMS phishing operation that tries to steal personal and financial data by spoofing the USPS, as well as postal services in at least a dozen other countries worldwide.