Simplify fetching of YARA rules for MACO extractors

.gitignore

@@ -1,2 +1,182 @@
-test.py
-.DS_Store
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+### VisualStudioCode ###
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+### VisualStudioCode Patch ###
+# Ignore all local history of files
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+
+# Ignore YARA rules that were downloaded from the core for MACO extractors
+*/parsers/yara/*.yar

modules/parsers/MACO/AgentTesla.py

@@ -1,8 +1,7 @@
-import os
-
-from cape_parsers.CAPE.community.AgentTesla import extract_config
 from maco.extractor import Extractor
 from maco.model import ExtractorModel as MACOModel
+from cape_parsers.CAPE.community.AgentTesla import extract_config
+from modules.parsers.utils import get_YARA_rule
 
 
 def convert_to_MACO(raw_config: dict) -> MACOModel:
@@ -15,7 +14,11 @@ def convert_to_MACO(raw_config: dict) -> MACOModel:
 
     parsed_result = MACOModel(family="AgentTesla", other=raw_config)
     if protocol == "Telegram":
-        parsed_result.http.append(MACOModel.Http(uri=raw_config["C2"], password=raw_config["Password"], usage="c2"))
+        parsed_result.http.append(
+            MACOModel.Http(
+                uri=raw_config["C2"], password=raw_config["Password"], usage="c2"
+            )
+        )
 
     elif protocol in ["HTTP(S)", "Discord"]:
         parsed_result.http.append(MACOModel.Http(uri=raw_config["C2"], usage="c2"))
@@ -43,7 +46,9 @@ def convert_to_MACO(raw_config: dict) -> MACOModel:
         parsed_result.smtp.append(MACOModel.SMTP(**smtp))
 
     if "Persistence_Filename" in raw_config:
-        parsed_result.paths.append(MACOModel.Path(path=raw_config["Persistence_Filename"], usage="storage"))
+        parsed_result.paths.append(
+            MACOModel.Path(path=raw_config["Persistence_Filename"], usage="storage")
+        )
 
     if "ExternalIPCheckServices" in raw_config:
         for service in raw_config["ExternalIPCheckServices"]:
@@ -57,7 +62,7 @@ class AgentTesla(Extractor):
     family = "AgentTesla"
     last_modified = "2024-10-20"
     sharing = "TLP:CLEAR"
-    yara_rule = open(os.path.join(os.path.dirname(__file__).split("/modules", 1)[0], f"data/yara/CAPE/{family}.yar")).read()
+    yara_rule = get_YARA_rule(family)
 
     def run(self, stream, matches):
         return convert_to_MACO(extract_config(stream.read()))

modules/parsers/MACO/AsyncRAT.py

@@ -1,8 +1,9 @@
 import os
 
-from cape_parsers.CAPE.community.AsyncRAT import extract_config
 from maco.extractor import Extractor
 from maco.model import ExtractorModel as MACOModel
+from cape_parsers.CAPE.community.AsyncRAT import extract_config
+from modules.parsers.utils import get_YARA_rule
 
 
 def convert_to_MACO(raw_config: dict) -> MACOModel:
@@ -25,16 +26,29 @@ def convert_to_MACO(raw_config: dict) -> MACOModel:
 
     # Installation Path
     if raw_config.get("Folder"):
-        parsed_result.paths.append(MACOModel.Path(path=os.path.join(raw_config["Folder"], raw_config["Filename"]), usage="install"))
+        parsed_result.paths.append(
+            MACOModel.Path(
+                path=os.path.join(raw_config["Folder"], raw_config["Filename"]),
+                usage="install",
+            )
+        )
 
     # C2s
     for i in range(len(raw_config.get("C2s", []))):
-        parsed_result.http.append(MACOModel.Http(hostname=raw_config["C2s"][i], port=int(raw_config["Ports"][i]), usage="c2"))
+        parsed_result.http.append(
+            MACOModel.Http(
+                hostname=raw_config["C2s"][i],
+                port=int(raw_config["Ports"][i]),
+                usage="c2",
+            )
+        )
     # Pastebin
     if raw_config.get("Pastebin") not in ["null", None]:
         # TODO: Is it used to download the C2 information if not embedded?
         # Ref: https://www.netskope.com/blog/asyncrat-using-fully-undetected-downloader
-        parsed_result.http.append(MACOModel.Http(uri=raw_config["Pastebin"], usage="download"))
+        parsed_result.http.append(
+            MACOModel.Http(uri=raw_config["Pastebin"], usage="download")
+        )
 
     return parsed_result
 
@@ -44,7 +58,7 @@ class AsyncRAT(Extractor):
     family = "AsyncRAT"
     last_modified = "2024-10-26"
     sharing = "TLP:CLEAR"
-    yara_rule = open(os.path.join(os.path.dirname(__file__).split("/modules", 1)[0], f"data/yara/CAPE/{family}.yar")).read()
+    yara_rule = get_YARA_rule(family)
 
     def run(self, stream, matches):
         return convert_to_MACO(extract_config(stream.read()))

modules/parsers/MACO/AuroraStealer.py

@@ -1,8 +1,7 @@
-import os
-
-from cape_parsers.CAPE.community.AuroraStealer import extract_config
 from maco.extractor import Extractor
 from maco.model import ExtractorModel as MACOModel
+from cape_parsers.CAPE.community.AuroraStealer import extract_config
+from modules.parsers.utils import get_YARA_rule
 
 
 def convert_to_MACO(raw_config: dict):
@@ -22,7 +21,7 @@ class AuroraStealer(Extractor):
     family = "AuroraStealer"
     last_modified = "2024-10-26"
     sharing = "TLP:CLEAR"
-    yara_rule = open(os.path.join(os.path.dirname(__file__).split("/modules", 1)[0], f"data/yara/CAPE/{family}.yar")).read()
+    yara_rule = get_YARA_rule(family)
 
     def run(self, stream, matches):
         return convert_to_MACO(extract_config(stream.read()))

modules/parsers/MACO/Azorult.py

@@ -1,21 +1,26 @@
-from cape_parsers.CAPE.core.Azorult import extract_config, rule_source
 from maco.extractor import Extractor
 from maco.model import ExtractorModel as MACOModel
+from cape_parsers.CAPE.core.Azorult import extract_config, rule_source
+from modules.parsers.utils import get_YARA_rule
 
 
 def convert_to_MACO(raw_config: dict):
     if not raw_config:
         return None
 
-    return MACOModel(family="Azorult", http=[MACOModel.Http(hostname=raw_config["address"])], other=raw_config)
+    return MACOModel(
+        family="Azorult",
+        http=[MACOModel.Http(hostname=raw_config["address"])],
+        other=raw_config,
+    )
 
 
 class Azorult(Extractor):
     author = "kevoreilly"
     family = "Azorult"
     last_modified = "2024-10-26"
     sharing = "TLP:CLEAR"
-    yara_rule = rule_source
+    yara_rule = get_YARA_rule(family) or rule_source
 
     def run(self, stream, matches):
         return convert_to_MACO(extract_config(stream.read()))

modules/parsers/MACO/BackOffLoader.py

@@ -1,6 +1,7 @@
-from cape_parsers.CAPE.community.BackOffLoader import extract_config
 from maco.extractor import Extractor
 from maco.model import ExtractorModel as MACOModel
+from cape_parsers.CAPE.community.BackOffLoader import extract_config
+from modules.parsers.utils import get_YARA_rule
 
 
 def convert_to_MACO(raw_config: dict):
@@ -14,7 +15,9 @@ def convert_to_MACO(raw_config: dict):
 
     # Encryption details
     parsed_result.encryption.append(
-        MACOModel.Encryption(algorithm="rc4", key=raw_config["EncryptionKey"], seed=raw_config["RC4Seed"])
+        MACOModel.Encryption(
+            algorithm="rc4", key=raw_config["EncryptionKey"], seed=raw_config["RC4Seed"]
+        )
     )
     for url in raw_config["URLs"]:
         parsed_result.http.append(MACOModel.Http(url=url))
@@ -27,6 +30,7 @@ class BackOffLoader(Extractor):
     family = "BackOffLoader"
     last_modified = "2024-10-26"
     sharing = "TLP:CLEAR"
+    yara_rule = get_YARA_rule(family)
 
     def run(self, stream, matches):
         return convert_to_MACO(extract_config(stream.read()))

modules/parsers/MACO/BackOffPOS.py

@@ -1,6 +1,7 @@
-from cape_parsers.CAPE.community.BackOffPOS import extract_config
 from maco.extractor import Extractor
 from maco.model import ExtractorModel as MACOModel
+from cape_parsers.CAPE.community.BackOffPOS import extract_config
+from modules.parsers.utils import get_YARA_rule
 
 
 def convert_to_MACO(raw_config: dict):
@@ -14,7 +15,9 @@ def convert_to_MACO(raw_config: dict):
 
     # Encryption details
     parsed_result.encryption.append(
-        MACOModel.Encryption(algorithm="rc4", key=raw_config["EncryptionKey"], seed=raw_config["RC4Seed"])
+        MACOModel.Encryption(
+            algorithm="rc4", key=raw_config["EncryptionKey"], seed=raw_config["RC4Seed"]
+        )
     )
     for url in raw_config["URLs"]:
         parsed_result.http.append(MACOModel.Http(url=url))
@@ -27,6 +30,7 @@ class BackOffPOS(Extractor):
     family = "BackOffPOS"
     last_modified = "2024-10-26"
     sharing = "TLP:CLEAR"
+    yara_rule = get_YARA_rule(family)
 
     def run(self, stream, matches):
         return convert_to_MACO(extract_config(stream.read()))