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When doorbells go rogue!

ID: 2305c2aa-b370-54b1-aa56-4ef8fd88299e

STIX ID: report--2305c2aa-b370-54b1-aa56-4ef8fd88299e

Feed Name: The Spamhaus Project

Threat Score
50/100

Date Published: 2021-10-19

Date Updated: 2026-04-30

Author: The Spamhaus Team

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The report explains how permissive network policies (open port 25, carrier-grade NAT with shared IPs, permissive Android app installs, and default ISP router configurations) combined with the COVID-19 pandemic’s shift to remote work to enable large-scale abuse of residential proxy networks for spam. This abuse not only disrupted small businesses by causing email blocks but also presents a credible risk that the same proxy infrastructure could be leveraged to deliver malware or facilitate further intrusions.

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