SapphireStealer: Open-source information stealer enables credential and data theft

SapphireStealer, an open-source information stealer, has been observed across public malware repositories with increasing frequency since its initial public release in December 2022. Information-stealing malware like SapphireStealer can be used to obtain sensitive information, including corporate credentials, which are often resold to other threat actors who leverage the access for additional attacks, including operations related to espionage or ransomware/extortion.

Cisco Talos assess with moderate confidence that multiple entities are using SapphireStealer, who have improved and modified the original code base separately, extending it to support additional data exfiltration mechanisms leading to the creation of several variants.

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Source: Cisco Talos