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Re:DEV-0537 targeting organizations for data exfiltration an... by maybe_pablo on Wednesday March 23, 2022 @06:11AM (#30776868)
I thought it had some relation to the Brazilian health system, "Sistema Único de Saúde" (known as SUS).
Re:DEV-0537 targeting organizations for data exfiltration an... by pid-1 on Wednesday March 23, 2022 @07:19AM (#30777275)
Me too, as it was one of their first targets.

From their audience and the way they write, it's quite likely they are (or started as) a group of BR hackers.