stage-19-fix: ThreatFox + MalwareBazaar — real API shape

Live test against abuse.ch revealed two issues with the stage-19 wiring:

- ThreatFox returns `ioc` (not `ioc_value`) and `first_seen` (not
  `first_seen_utc`) — older field names from stale docs. Parser now reads
  the real names and falls back to the old aliases defensively. Also
  captures `malware_malpedia` (per-family writeup URL) and
  `threat_type_desc` for richer downstream prose.
- MalwareBazaar's API expects form-encoded bodies, unlike ThreatFox's
  JSON. Extended _http with form_body=; MB fetcher switched to it.

Verified live: 10 ThreatFox cases landed with mixed botnet/malware
classification (4/6 split from threat_type signal — first real
incident-type diversity from a single feed). 10 MalwareBazaar cases
landed with sha256+sha1 hash observables and exe/file_type metadata.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/psyc/lines/scout.py

@@ -34,13 +34,22 @@ OTX_PULSES_API = "https://otx.alienvault.com/api/v1/pulses/subscribed"
 _log = log.get(__name__)
 
 
-def _http(method: str, url: str, headers: Optional[Dict[str, str]] = None, json_body: Optional[Dict[str, Any]] = None) -> httpx.Response:
+def _http(
+    method: str,
+    url: str,
+    headers: Optional[Dict[str, str]] = None,
+    json_body: Optional[Dict[str, Any]] = None,
+    form_body: Optional[Dict[str, Any]] = None,
+) -> httpx.Response:
     h = {"User-Agent": USER_AGENT}
     if headers:
         h.update(headers)
     with httpx.Client(timeout=HTTP_TIMEOUT, headers=h, follow_redirects=True) as client:
         if method.upper() == "POST":
-            resp = client.post(url, json=json_body)
+            if form_body is not None:
+                resp = client.post(url, data=form_body)
+            else:
+                resp = client.post(url, json=json_body)
         else:
             resp = client.get(url)
         resp.raise_for_status()
@@ -168,7 +177,8 @@ THREATFOX_THREAT_TYPE: Dict[str, IncidentType] = {
 
 
 def _threatfox_row_to_case(r: Dict[str, Any]) -> Optional[Case]:
-    ioc_value = str(r.get("ioc_value") or "").strip()
+    # API field is `ioc` (the `_value` alias is older docs); date is `first_seen`.
+    ioc_value = str(r.get("ioc") or r.get("ioc_value") or "").strip()
     ioc_type = str(r.get("ioc_type") or "").lower()
     if not ioc_value or not ioc_type:
         return None
@@ -197,6 +207,7 @@ def _threatfox_row_to_case(r: Dict[str, Any]) -> Optional[Case]:
 
     threat_label = threat_type.replace("_", " ") or "malware"
     summary = f"ThreatFox: {malware} {threat_label} — {ioc_value}"
+    first_seen = str(r.get("first_seen") or r.get("first_seen_utc") or "")
     return Case(
         case_id=f"PSYC-THREATFOX-{r.get('id', '')}",
         summary=summary,
@@ -205,13 +216,15 @@ def _threatfox_row_to_case(r: Dict[str, Any]) -> Optional[Case]:
         source_metadata=dict(
             feed="threatfox",
             malware=malware,
+            malware_malpedia=str(r.get("malware_malpedia") or ""),
             threat_type=threat_type,
+            threat_type_desc=str(r.get("threat_type_desc") or ""),
             ioc_type=ioc_type,
             confidence_level=str(r.get("confidence_level", "")),
             tags=",".join(t for t in tags if t),
             reporter=str(r.get("reporter", "")),
         ),
-        observed_at=_parse_dt(str(r.get("first_seen_utc", "")), "%Y-%m-%d %H:%M:%S"),
+        observed_at=_parse_dt(first_seen, "%Y-%m-%d %H:%M:%S"),
         observables=obs,
     )
 
@@ -268,7 +281,8 @@ def _fetch_malware_bazaar() -> List[Case]:
     key = os.environ.get("THREATFOX_AUTH_KEY", "").strip()
     if not key:
         raise RuntimeError("THREATFOX_AUTH_KEY not set — abuse.ch auth-key from https://auth.abuse.ch/ also covers MalwareBazaar")
-    data = _http("POST", MALWARE_BAZAAR_API, headers={"Auth-Key": key}, json_body={"query": "get_recent", "selector": "100"}).json()
+    # MalwareBazaar expects form-encoded body (unlike ThreatFox which takes JSON).
+    data = _http("POST", MALWARE_BAZAAR_API, headers={"Auth-Key": key}, form_body={"query": "get_recent", "selector": "100"}).json()
     rows = data.get("data") or []
     out: List[Case] = []
     for r in rows: