What is a malware domain blocklist?
A malware domain blocklist is a curated collection of domains and IP addresses known to host malware, phishing, command-and-control (C2) infrastructure, or exfiltration endpoints.
For web skimming the value is direct: if a checkout page connects to a domain on such a list, you have a confirmed incident — not merely a suspicion.
Why one source is not enough
Different feeds cover different threats, update at different frequencies, and have different false-positive rates. Relying on a single list leaves wide blind spots.
That's why ExploitShield consolidates over 500 sources across several categories: commercial intelligence (Spamhaus DBL, DROP, SURBL), open community feeds (URLhaus, OpenPhish, PhishTank, abuse.ch, MalwareBazaar, Feodo Tracker, ThreatFox), DNS-layer reputation (Quad9, public OpenDNS lists), and general detection lists (Maltrail, StevenBlack).
How 500+ sources are merged
Each feed is normalized to a canonical form (domain, IP, or URL pattern), deduplicated across sources, tagged with provenance and trust, and refreshed hourly.
At every scan the outbound destinations seen by the real browser are checked against the merged set — not a stale local copy.
Why update frequency matters
Exfiltration domains often live only days. A weekly-updated list misses them entirely.
By checking at every scan against hourly-refreshed feeds, we catch domains in their first hours of activity — exactly the window in which a campaign inflicts the most damage. A brand-new domain not yet in any feed is flagged via WHOIS age and skimmer-endpoint heuristics.
Frequently Asked Questions
What is a malware domain blocklist and how is it used?
It is a curated collection of known malicious domains and IP addresses. ExploitShield checks every outbound destination seen by a real browser during a scan against a merged set of 500+ sources — confirming incidents when a monitored page connects to a flagged domain.
How often are the blocklists updated?
The merged set is normalized and refreshed hourly, and the check happens at every scan — so exfiltration domains are caught within their first hours of activity rather than days later.
What happens with a brand-new domain not yet on any list?
In addition to the blocklists, every destination is assessed via WHOIS age, IP reputation, and skimmer-endpoint heuristics — so newly registered exfiltration endpoints are flagged before they appear in any public feed.