New threat object type

Author: ljstella

contentctl/objects/rba.py

@@ -33,6 +33,7 @@ class ThreatObjectType(str, Enum):
     REGISTRY_VALUE_NAME = "registry_value_name"
     REGISTRY_VALUE_TEXT = "registry_value_text"
     SERVICE = "service"
+    SIGNATURE = "signature"
     SYSTEM = "system"
     TLS_HASH = "tls_hash"
     URL = "url"
@@ -55,4 +56,4 @@ def __hash__(self):
 class rba_object(BaseModel, ABC):
     message: str
     risk_objects: Set[risk_object] 
-    threat_objects: Set[threat_object]
+    threat_objects: Set[threat_object]