Threat Assessment: DearCry Ransomware

Last week, Microsoft reported that attackers compromised Exchange Mail Servers with the use of four zero-day vulnerabilities. While patches have been released by Microsoft, adversaries are still attacking vulnerable versions of Microsoft Exchange Servers with malicious tools, malware and data exfiltration. Further, Microsoft has confirmed the existence of a ransomware variant leveraging these vulnerabilities, which has been dubbed “DearCry.” It is reasonable to suspect that the ransomware authors were paying homage to an unrelated yet infamous ransomware family, “WannaCry,” which was used as a payload within an orchestrated attack campaign leveraging known Microsoft vulnerabilities to infect victims en masse.

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