Cybercriminals who specialize in ransomware do not always create it themselves. They have many other ways to get their hands on ransomware samples: buying a sample on the dark web, affiliating with other groups or finding a (leaked) ransomware variant.
This requires no extraordinary effort, as source code is often leaked or published. With a set of standard tools and a freshly built (and sometimes slightly altered) ransomware sample, victims can be sought, and the malicious activity can spread.
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Source: Kaspersky
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