Merge pull request #423 from kevross33/patch-54

Create flarecapa_lib.py

modules/signatures/all/flarecapa_lib.py

@@ -0,0 +1,68 @@
+# Copyright (C) 2024 Kevin Ross
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from lib.cuckoo.common.abstracts import Signature
+
+class FlareCAPALib(Signature):
+    name = "flare_capa_lib"
+    description = "CAPA detected interesting code functions"
+    severity = 2
+    categories = ["misc"]
+    authors = ["Kevin Ross"]
+    minimum = "1.3"
+    evented = True
+
+    def run(self):
+        ret = False
+
+        target = self.results.get("target", {})
+        if target.get("category") in ("file", "static") and target.get("file"):
+            capa = self.results["target"]["file"].get("flare_capa", [])          
+            if capa:
+                samplesha256 = capa["sha256"]
+                capabilities = capa["CAPABILITY"]
+                for namespace, capability in capabilities.items():
+                    if "lib" in namespace:
+                        ret = True
+                        joined = ', '.join(capability)
+                        self.data.append({"target": "SHA256 %s - %s %s" % (samplesha256, namespace, joined)})
+
+        for block in self.results.get("CAPE", {}).get("payloads", []) or []:          
+            capa = block.get("flare_capa", [])
+            if capa:
+                samplesha256 = capa["sha256"]
+                capabilities = capa["CAPABILITY"]
+                for namespace, capability in capabilities.items():
+                    if "lib" in namespace:
+                        ret = True
+                        joined = ', '.join(capability)
+                        self.data.append({"payload": "SHA256 %s - %s %s" % (samplesha256, namespace, joined)})
+
+        for keyword in ("procdump", "procmemory", "extracted", "dropped"):
+            if self.results.get(keyword) is not None:
+                for block in self.results.get(keyword, []):
+                    if not isinstance(block, dict):
+                        continue
+                    capa = block.get("flare_capa", [])
+                    if capa:
+                        samplesha256 = capa["sha256"]
+                        capabilities = capa["CAPABILITY"]
+                        for namespace, capability in capabilities.items():
+                            if "lib" in namespace:
+                                ret = True
+                                joined = ', '.join(capability)
+                                self.data.append({keyword: "SHA256 %s - %s %s" % (samplesha256, namespace, joined)})
+
+        return ret