verify target file type and warn user

capa/features/extractors/cape/extractor.py

@@ -128,6 +128,14 @@ class CapeExtractor(DynamicFeatureExtractor):
         if cr.info.version not in TESTED_VERSIONS:
             logger.warning("CAPE version '%s' not tested/supported yet", cr.info.version)
 
+        # TODO(mr-tz): support more file types
+        # https://github.com/mandiant/capa/issues/1933
+        if "PE" not in cr.target.file.type:
+            logger.error(
+                "capa currently only supports PE target files, this target file's type is: '%s'.\nPlease report this at: https://github.com/mandiant/capa/issues/1933",
+                cr.target.file.type,
+            )
+
         # observed in 2.4-CAPE reports from capesandbox.com
         if cr.static is None and cr.target.file.pe is not None:
             cr.static = Static()

capa/helpers.py

@@ -156,7 +156,7 @@ def log_unsupported_format_error():
 
 def log_unsupported_cape_report_error(error: str):
     logger.error("-" * 80)
-    logger.error("Input file is not a valid CAPE report: %s", error)
+    logger.error(" Input file is not a valid CAPE report: %s", error)
     logger.error(" ")
     logger.error(" capa currently only supports analyzing standard CAPE reports in JSON format.")
     logger.error(

tests/test_cape_model.py

@@ -6,10 +6,13 @@
 #  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and limitations under the License.
 import gzip
+from typing import Type
 from pathlib import Path
 
+import pytest
 import fixtures
 
+from capa.exceptions import EmptyReportError, UnsupportedFormatError
 from capa.features.extractors.cape.models import Call, CapeReport
 
 CD = Path(__file__).resolve().parent
@@ -41,6 +44,35 @@ def test_cape_model_can_load(version: str, filename: str):
     assert report is not None
 
 
+@fixtures.parametrize(
+    "version,filename,exception",
+    [
+        ("v2.2", "0000a65749f5902c4d82ffa701198038f0b4870b00a27cfca109f8f933476d82.json.gz", None),
+        ("v2.2", "55dcd38773f4104b95589acc87d93bf8b4a264b4a6d823b73fb6a7ab8144c08b.json.gz", None),
+        ("v2.2", "77c961050aa252d6d595ec5120981abf02068c968f4a5be5958d10e87aa6f0e8.json.gz", EmptyReportError),
+        ("v2.2", "d46900384c78863420fb3e297d0a2f743cd2b6b3f7f82bf64059a168e07aceb7.json.gz", None),
+        ("v2.4", "36d218f384010cce9f58b8193b7d8cc855d1dff23f80d16e13a883e152d07921.json.gz", UnsupportedFormatError),
+        ("v2.4", "41ce492f04accef7931b84b8548a6ca717ffabb9bedc4f624de2d37a5345036c.json.gz", UnsupportedFormatError),
+        ("v2.4", "515a6269965ccdf1005008e017ec87fafb97fd2464af1c393ad93b438f6f33fe.json.gz", UnsupportedFormatError),
+        ("v2.4", "5d61700feabba201e1ba98df3c8210a3090c8c9f9adbf16cb3d1da3aaa2a9d96.json.gz", UnsupportedFormatError),
+        ("v2.4", "5effaf6795932d8b36755f89f99ce7436421ea2bd1ed5bc55476530c1a22009f.json.gz", UnsupportedFormatError),
+        ("v2.4", "873275144af88e9b95ea2c59ece39b8ce5a9d7fe09774b683050098ac965054d.json.gz", UnsupportedFormatError),
+        ("v2.4", "8b9aaf4fad227cde7a7dabce7ba187b0b923301718d9d40de04bdd15c9b22905.json.gz", UnsupportedFormatError),
+        ("v2.4", "b1c4aa078880c579961dc5ec899b2c2e08ae5db80b4263e4ca9607a68e2faef9.json.gz", UnsupportedFormatError),
+        ("v2.4", "fb7ade52dc5a1d6128b9c217114a46d0089147610f99f5122face29e429a1e74.json.gz", None),
+    ],
+)
+def test_cape_extractor(version: str, filename: str, exception: Type[BaseException]):
+    path = CAPE_DIR / version / filename
+
+    if exception:
+        with pytest.raises(exception):
+            _ = fixtures.get_cape_extractor(path)
+    else:
+        cr = fixtures.get_cape_extractor(path)
+        assert cr is not None
+
+
 def test_cape_model_argument():
     call = Call.model_validate_json(
         """