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import androguard.core.bytecodes.apk # type: ignore
from karton.core import Karton, Task # type: ignore
from .__version__ import __version__
class Android(Karton):
"""
Augment apk files with various metadata.
"""
identity = "karton.android"
version = __version__
filters = [
{"type": "sample", "extension": "apk"},
]
def process(self, task: Task) -> None:
sample = task.get_resource("sample")
a = androguard.core.bytecodes.apk.APK(sample.content, raw=True)
if not a.is_valid_APK():
self.log.info("Not a valid APK file.")
return
metadata = {
"activities": sorted(a.get_activities()),
"main_activity": [a.get_main_activity()],
"package": [a.package.strip()],
"permissions": sorted(a.get_permissions()),
}
app_name = a.get_app_name().strip()
if app_name:
metadata["app_name"] = [app_name]
if a.is_signed() or a.is_signed_v3():
certs = a.get_certificates()
if len(certs):
cert = certs[0]
sha1_cert = cert.sha1_fingerprint.replace(" ", "")
cert_validity = cert["tbs_certificate"]["validity"]
not_before_raw = cert_validity["not_before"]
not_before = not_before_raw.native.strftime("%b %-d %X %Y %Z")
not_after_raw = cert_validity["not_after"]
not_after = not_after_raw.native.strftime("%b %-d %X %Y %Z")
metadata.update(
{
"certificate": [sha1_cert],
"certificate_issuer": [cert.issuer.human_friendly],
"certificate_not_after": [not_after],
"certificate_not_before": [not_before],
"certificate_serial": [str(cert.serial_number)],
"certificate_subject": [cert.subject.human_friendly],
}
)
self.send_task(
Task(
headers={
"type": "sample",
"stage": "analyzed",
},
payload={"sample": sample, "attributes": metadata},
)
)
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