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Same-Second Certificate Reuse Exposes a Templated Provisioning Habit

A self-signed TLS certificate with serial "1" was issued at the exact same second on two unrelated domains registered two and a half years apart, and a second exact-serial match ties a Georgian domain to a Tbilisi hosting IP. The pattern points to automated cert-provisioning tooling rather than a bespoke build.

Aug 22, 2026, 22:37 (UTC+9)Last seenSep 29, 2026Severity100ByCTX TeamActorSalty SpiderKuKuIOC57MITRE15RegionsUS

A self-signed TLS certificate carrying serial number "1" was issued at 2025-09-03 05:55:01 — and only that exact second — on two domains that have nothing else in common on paper: bijibali.com, registered 2023-08-26, and inspiringgemsshop.com, registered 2026-02-11, roughly two and a half years apart. Both certificates share an identical thumbprint and the same placeholder issuer and subject line, "localhost." That is not a coincidence of timing; a certificate minted at one instant cannot…

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Source: CTX Threat Intelligence