#Sha256

A four-step breakdown of AWS SigV4 with an 80-line Python implementation, the asymmetric SigV4A (ECDSA P-256) that Multi-Region Access Point forced into existence, plus Chunked Upload, Presigned URL, and the Clock Skew traps that bite in production.

Verify Stripe, GitHub, Shopify webhook signatures the right way. Production-ready HMAC-SHA256 examples in Node, Python, Ruby — plus the 6 specific bugs that wreck the same code 80% of providers share.

See details and IOCs of Akamai SIRT’s discovery of active exploitation of the command injection vulnerabilities CVE-2024-6047 and CVE-2024-11120.

In this report we will share our research on the PhotoMiner’s timelines, infection strategies, C&C servers and provide tools to help detect the malware.