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static_analysis_apk.py
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static_analysis_apk.py
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import re
import androguard.core.bytecodes.apk as apk
import androguard.core.bytecodes.dvm as dvm
def static_analysis(file, all_permissions, all_api_calls):
apk_features = []
a = apk.APK(file)
print("App name:", a.get_app_name())
d = dvm.DalvikVMFormat(a.get_dex())
perms = a.get_permissions()
classes = len(d.get_classes())
api_calls = set()
for current_class in d.get_classes():
for current_method in current_class.get_methods():
if code := current_method.get_code():
for i in code.get_bc().get_instructions():
if i.get_name() == "invoke-virtual":
api_call_signature = i.get_output().split(",")[-1].strip(")")[1:-1]
api_calls.update([api_call.split("->")[1] for api_call in
re.findall(r"[^\s]+(?=\()", str(api_call_signature))])
all_permissions.update(perms)
all_api_calls.update(api_calls)
perm_vector = [1 if perm in perms else 0 for perm in all_permissions]
api_call_vector = [1 if api_call in api_calls else 0 for api_call in all_api_calls]
apk_features.append(len(perms))
apk_features.extend(perm_vector)
apk_features.append(classes)
apk_features.append(len(api_calls))
apk_features.extend(api_call_vector)
return apk_features, perms, api_calls
def create_features(apks, all_permissions, all_api_calls):
features = []
for apk in apks:
apk_features, _, _ = static_analysis(apk, all_permissions, all_api_calls)
features.append(apk_features)
return features