Experts Detect Multi-Layer Redirect Tactic Used to Steal Microsoft 365 Login Credentials
Jul 31, 2025
Phishing / Threat Intelligence
Cybersecurity researchers have disclosed details of a new phishing campaign that conceals malicious payloads by abusing link wrapping services from Proofpoint and Intermedia to bypass defenses. "Link wrapping is designed by vendors like Proofpoint to protect users by routing all clicked URLs through a scanning service, allowing them to block known malicious destinations at the moment of click," the Cloudflare Email Security team said . "While this is effective against known threats, attacks can still succeed if the wrapped link hasn't been flagged by the scanner at click time." The activity, observed over the last two months, once again illustrates how threat actors find different ways to leverage legitimate features and trusted tools to their advantage and perform malicious actions, in this case, redirecting victims to Microsoft 365 phishing pages. It's noteworthy that the abuse of link wrapping involves the attackers gaining unauthorized access to em...