Sparrow is a CISA threat-detection program that was released in Dec 2020. https://github.com/cisagov/sparrow/releases
Releases · cisagov/Sparrow · GitHub
Sparrow.ps1 was created by CISA's Cloud Forensics team to help detect possible compromised accounts and applications in the Azure/m365 environment. - cisagov/Sparrow
https://github.com/cisagov/sparrow/releases