file-by-hash
MalShare
A community-run public malware repository with millions of samples, offering hash search and sample download. Its straightforward API is keyed but free — self-serve registration grants 2,000 calls a day. A lower-barrier alternative to invite-only repositories when you need to check or retrieve a sample by hash.
API key required
Why it’s useful & how it works
FREE self-serve key (2000 calls/day). Simple GET+key JSON. Works via proxy (direct errored). Lower barrier than VirusShare.
What’s inside
Millions of samples.
API access
https://malshare.com/api.php?api_key= <KEY>&action=details&hash=<h>
An API key is required — usually free; see the endpoints above for where to get one.
Access
Programmatic API access (a key may be required — see the API tag).