ISC StormCast for Tuesday, May 3rd, 2022

Detecting VSTO Office Files with ExifTool
https://isc.sans.edu/forums/diary/Detecting+VSTO+Office+Files+With+ExifTool/28604/
The Gmail SMTP Relay Service Exploit
https://www.avanan.com/blog/the-gmail-smtp-relay-service-exploit
OpenSSF Package Analysis
https://openssf.org/blog/2022/04/28/introducing-package-analysis-scanning-open-source-packages-for-malicious-behavior/
M1 Prefetcher Data Leak
https://www.prefetchers.info