anti 3f080f601d feat(intel,ingester): mal_hash feed + observed_attachments table (DEBT-046) ...

New MalHashProvider sibling ABC (decnet/intel/base.py) since SHA-256
is a different keyspace from IntelProvider's IPs. MalwareBazaarProvider
mirrors FeodoProvider's bulk-feed shape: 24h refresh via _ensure_fresh
/ _refresh, in-memory set[str] of hex-lowercased hashes, set-membership
lookup. Auth-keyed via DECNET_MALWAREBAZAAR_AUTH_KEY; absent key
silent-no-ops the lane (single warning, no HTTP traffic).

Per-hash observations persist to a new observed_attachments table.
DECNET is a honeypot platform — every attachment hash an attacker
delivers is intel, regardless of whether anyone classified it. Verdict
is sticky: True never downgrades to False/None on subsequent
observations. Out of scope: API surface, federation export, retention.

Ingester _publish_email_received calls the provider for each attachment
sha256, sets mal_hash_match on the bus payload (omitted entirely when
the message had no attachments — keeps R0046's `is True` predicate
silent on hash-less mail, matching pre-paydown behavior), and upserts
the row regardless of provider availability.

2026-05-03 05:56:46 -04:00

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