test
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296
tests/test.py
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296
tests/test.py
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import logging
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FORMAT = "[%(levelname)s] %(name)s %(filename)s:%(lineno)d: %(message)s"
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logging.basicConfig(format=FORMAT)
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logging.getLogger().setLevel(logging.DEBUG)
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import json
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import zipfile as z
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import re
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from pathlib import Path
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from androscalpel import Apk, IdType, IdMethodType, ins, DexString, IdMethod, Code, utils # type: ignore
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RED = "\033[38:2:255:0:0m"
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GREEN = "\033[38:2:0:255:0m"
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ENDC = "\033[0m"
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RE_CHECK_DEXFILE = re.compile(r"classes\d*.dex")
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def is_dexfile(filename: str) -> bool:
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return bool(RE_CHECK_DEXFILE.fullmatch(filename))
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ORIGINAL_APK = Path(__file__).parent / "origin-release.apk"
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DYN_LOAD_APK = Path(__file__).parent / "ut-dyn-load-release.apk"
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DEX_NAME = "classes.dex"
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clazz_id = IdType("Lcom/example/ut_dyn_load/Loader;")
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proto_id = IdMethodType(IdType.void(), [IdType("Landroid/content/Context;")])
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method_id = IdMethod("load", proto_id, clazz_id)
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def load_apk(path_apk: Path) -> Apk:
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print(f"[+] Load bytecode ")
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apk = Apk()
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with z.ZipFile(path_apk) as zipf:
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for file in filter(is_dexfile, zipf.namelist()):
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print(f"[-] {file}")
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with zipf.open(file, "r") as dex_f:
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dex = dex_f.read()
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apk.add_dex_file(dex)
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return apk
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print(f"[+] Load bytecode ")
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dyn_load_apk = load_apk(DYN_LOAD_APK)
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clazz = dyn_load_apk.classes[clazz_id]
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method = clazz.virtual_methods[method_id]
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code = method.code
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logging.getLogger().setLevel(logging.WARNING)
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def is_evasion_method(meth: IdMethod) -> bool:
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return (
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method.class_ == IdType.from_smali("Ldalvik/system/PathClassLoader;")
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or (
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method.class_ == IdType.from_smali("Ljava/lang/Class;")
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and method.name == "newInstance"
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)
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or (
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method.class_ == IdType.from_smali("Ljava/lang/Class;")
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and method.name == "getMethod"
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)
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or method.class_ == IdType.from_smali("Ljava/lang/reflect/Method;")
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)
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print(f"[+] Code of {method_id} ")
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for inst in code.insns:
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match inst:
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case ins.InvokeVirtual(args=args, method=method) if is_evasion_method(method):
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print(f" {RED}{inst}{ENDC}")
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case ins.SGetObject(to=to, field=field):
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print(f" {inst}")
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print(
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f" val: {GREEN}{dyn_load_apk.classes[field.class_].static_fields[field].value}{ENDC}"
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)
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case inst:
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print(f" {inst}")
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malicious_class_id = IdType("Lcom/example/ut_dyn_load/SmsReceiver;")
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mal_cls_in_apk = malicious_class_id in dyn_load_apk.classes
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if mal_cls_in_apk:
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color = GREEN
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else:
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color = RED
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print(f"[+] {malicious_class_id} in loaded apk: {color}{mal_cls_in_apk}{ENDC}")
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print(f"[+] Load bytecode in assets/classes")
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with z.ZipFile(DYN_LOAD_APK) as zipf:
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with zipf.open("assets/classes", "r") as dex_f:
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dex = dex_f.read()
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dyn_load_apk.add_dex_file(dex)
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mal_cls_in_apk = malicious_class_id in dyn_load_apk.classes
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if mal_cls_in_apk:
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color = GREEN
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else:
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color = RED
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print(f"[+] {malicious_class_id} in loaded apk: {color}{mal_cls_in_apk}{ENDC}")
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print(
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f"[+] -- very simplified steep, see https://developer.android.com/reference/java/lang/Class#getMethod(java.lang.String,%20java.lang.Class%3C?%3E[])"
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)
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name = "a"
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args = [
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IdType("Landroid/content/Context;"),
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IdType("Landroid/content/BroadcastReceiver;"),
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]
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malicious_class = dyn_load_apk.classes[malicious_class_id]
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potential_meth = []
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for m_id in malicious_class.direct_methods:
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if m_id.name == name and m_id.proto.get_parameters() == args:
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potential_meth.append((m_id, "direct"))
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for m_id in malicious_class.virtual_methods:
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if m_id.name == name and m_id.proto.get_parameters() == args:
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potential_meth.append(m_id, "virtual")
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print("[+] Potential methods:")
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for m, t in potential_meth:
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print(f" {m}({t})")
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exit()
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new_insns = []
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for i in code.insns:
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if isinstance(i, ins.ConstString):
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if i.lit == "Hello":
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i = ins.ConstString(i.reg, DexString("Degemer Mat"))
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elif i.lit == "Bye":
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i = ins.ConstString(i.reg, DexString("Kenavo"))
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new_insns.append(i)
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# This need improving!
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code = Code(code.registers_size, code.ins_size, code.outs_size, new_insns)
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apk.set_method_code(method_id, code)
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# apk.set_method_code(method.descriptor, code)
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clazz = apk.classes[clazz_id]
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method = clazz.virtual_methods[method_id]
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code = method.code
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print(f"[+] New code of {method_id} ")
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for i in code.insns:
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print(f" {i}")
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# # Strip class for debugging
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# classes = list(
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# filter(
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# lambda x: x
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# not in [
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# IdType("Lcom/example/testapplication/ui/home/HomeViewModel;"),
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# IdType("Landroidx/navigation/NavDeepLink$Builder;"),
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# IdType("Landroidx/constraintlayout/core/widgets/ConstraintWidget$1;"),
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# IdType("Landroidx/appcompat/app/ActionBar;"),
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# IdType("Landroidx/constraintlayout/core/state/WidgetFrame;"),
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# IdType("Landroidx/appcompat/app/AppCompatViewInflater;"),
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# ],
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# apk.classes.keys(),
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# )
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# )
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# for cls in classes:
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# apk.remove_class(cls)
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#
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print("[+] Recompile")
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dex_raw = apk.gen_raw_dex()
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new_apk = Apk()
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for dex in dex_raw:
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new_apk.add_dex_file(dex)
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print("[+] Repackage")
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utils.replace_dex(
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APK_NAME,
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APK_NAME.parent / (APK_NAME.name.removesuffix(".apk") + "-instrumented.apk"),
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dex_raw,
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Path().parent / "my-release-key.jks",
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zipalign=Path.home() / "Android" / "Sdk" / "build-tools" / "34.0.0" / "zipalign",
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apksigner=Path.home() / "Android" / "Sdk" / "build-tools" / "34.0.0" / "apksigner",
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)
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last_id = None
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MAX_REQ = 1
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def cmp(a, b, req=0):
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if req > MAX_REQ:
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return
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if type(a) == dict:
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cmp_dict(a, b, req)
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elif type(a) == list:
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cmp_list(a, b, req)
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else:
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cmp_other(a, b, req)
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def nice_bool(b) -> str:
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if b:
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return "\033[32mTrue\033[0m"
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else:
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return "\033[31mFalse\033[0m"
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def cmp_other(a, b, req=0):
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ident = " " * req
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for f in dir(a):
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if getattr(getattr(a, f), "__call__", None) is None and (
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len(f) < 2 or f[:2] != "__"
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):
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eq = getattr(a, f) == getattr(b, f)
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print(f"{f'{ident}{f}: ':<150}{nice_bool(eq)}")
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if not eq:
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if "descriptor" in dir(a):
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global last_id
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last_id = a.descriptor
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cmp(getattr(a, f), getattr(b, f), req + 1)
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def cmp_dict(a, b, req=0):
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ident = " " * req
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keys_a = set(a.keys())
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keys_b = set(b.keys())
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if keys_a != keys_b:
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print(f"{ident}a.keys() != b.keys()")
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tot = 0
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nb_failed = 0
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for key in keys_a & keys_b:
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eq = a[key] == b[key]
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tot += 1
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if not eq:
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nb_failed += 1
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print(f"{f'{ident}{str(key)}: ':<150}{nice_bool(eq)}")
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global last_id
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last_id = key
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cmp(a[key], b[key], req + 1)
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print(f"\033[32m{tot-nb_failed}\033[0m + \033[31m{nb_failed}\033[0m = {tot}")
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def cmp_list(a, b, req=0):
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ident = " " * req
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la = len(a)
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lb = len(b)
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if la != lb:
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print(f"{ident}len(a) != len(b)")
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for i in range(min(la, lb)):
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eq = a[i] == b[i]
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print(f"{f'{ident}{str(i)}: ':<150}{nice_bool(eq)}")
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if not eq:
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cmp(a[i], b[i], req + 1)
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# apk_eq = new_apk == apk
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# print(f"[+] apk are equals: {nice_bool(apk_eq)}")
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# if not apk_eq:
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# cmp(new_apk, apk)
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# Landroidx/constraintlayout/core/widgets/ConstraintWidget$1;.<clinit>()V
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# mid = IdMethod(
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# "<clinit>",
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# IdMethodType(
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# IdType.void(),
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# [],
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# ),
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# IdType("Landroidx/constraintlayout/core/widgets/ConstraintWidget$1;"),
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# )
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# m = apk.classes[mid.class_].direct_methods[mid]
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# nm = new_apk.classes[mid.class_].direct_methods[mid]
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# mid = IdMethod(
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# "setValue",
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# IdMethodType(
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# IdType("Z"),
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# [
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# IdType("Ljava/lang/String;"),
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# IdType("Landroidx/constraintlayout/core/parser/CLElement;"),
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# ],
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# ),
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# IdType("Landroidx/constraintlayout/core/state/WidgetFrame;"),
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# )
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#
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# m = apk.classes[mid.class_].virtual_methods[mid]
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# nm = new_apk.classes[mid.class_].virtual_methods[mid]
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# c = m.code
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# nc = nm.code
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# cc = c.with_normalized_labels()
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# ncc = nc.with_normalized_labels()
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