NEW DELHI—A Chinese state-backed hacking group has in recent weeks targeted the IT systems of two Indian vaccine makers whose coronavirus shots are being used in the country’s immunization campaign, cyber intelligence firm Cyfirma told Reuters. Rivals China and India have both sold or gifted COVID-19 shots to many countries. India produces more than 60 percent of all vaccines sold in the world. Goldman Sachs-backed Cyfirma, based in Singapore and Tokyo, said Chinese hacking group APT10, also known as Stone Panda, had identified gaps and vulnerabilities in the IT infrastructure and supply chain software of Bharat Biotech and the Serum Institute of India (SII), the world’s largest vaccine maker. “The real motivation here is actually exfiltrating intellectual property and getting a competitive advantage over Indian pharmaceutical companies,” said Cyfirma Chief Executive Kumar Ritesh, formerly a top cyber official with British foreign intelligence agency MI6. He said APT10 was actively targeting …