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Similarweb

Similarweb is a competitive intelligence and web analytics vendor that operates one of the largest clickstream data harvesting operations in the industry, collecting browsing data from browser extensions, ISP partnerships, and a contributory network — with documented ties to Big Star Labs, a data collection entity linked to extensions affecting 3.7 million users.

15 IOCs
22
Vendor Risk Score
Intelligence Briefing

Full Similarweb Threat Intelligence Report

Everything BLACKOUT observed, analyzed, and documented — key findings, disclosure gaps, customer impact, negotiation leverage, runtime detections, IOC manifest, and role-specific action plans.

Security
  • Full BTI threat code breakdown with severity ratings
  • Network patterns, beacon endpoints, and IOC manifest
  • Supply chain dependencies and attack surface mapping
Legal
  • Regulation-specific violation mapping (GDPR, CCPA, ePrivacy)
  • Side-by-side claim vs observed behavior with evidence
  • Documented violations for contract renegotiation
Privacy
  • Pre-consent data collection evidence with timestamps
  • Cookie and storage key inventory with purposes
  • Undisclosed subprocessors and data recipients
Procurement
  • Evidence-backed talking points for vendor meetings
  • Contractual obligation gaps you can act on
  • Role-specific action plans for existing users and evaluators
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