Investigators at Moscow-based cybersecurity firm Kaspersky had said the “backdoor” used to compromise up to 18,000 customers of US software maker SolarWinds resembled malware tied to a hacking group known as “Turla,” which operates on behalf of Russia’s FSB security service. Moscow had repeatedly denied the allegations. Experts mentioned three similarities between the SolarWinds backdoor and a hacking tool called “Kazuar” used by Turla made it likely Russian in origin.

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