wip
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3 changed files with 161 additions and 81 deletions
189
tests/test.py
189
tests/test.py
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@ -50,7 +50,7 @@ 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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# logging.getLogger().setLevel(logging.WARNING)
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def is_evasion_method(meth: IdMethod) -> bool:
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@ -95,7 +95,7 @@ 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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# 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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@ -112,60 +112,145 @@ 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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# malicious_class = dyn_load_apk.classes[malicious_class_id]
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#
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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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#
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# print("[+] Potential methods:")
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# for m_id, t in potential_meth:
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# print(f" {m_id}({t})")
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#
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# m_id, t = potential_meth[0]
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#
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# new_insns = (
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# code.insns[:42]
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# + [
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# ins.NewInstance(1, IdType("Lcom/example/ut_dyn_load/SmsReceiver;")),
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# ins.InvokeVirtual(m_id, [1, 8, 1]),
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# ]
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# + code.insns[62:]
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# )
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#
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# print(f"[+] New code ")
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# for i, inst in enumerate(new_insns):
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# if i >= 42 and i < 44:
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# print(f"{i:>03} {GREEN}{inst}{ENDC}")
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# continue
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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"{i:>03} {RED}{inst}{ENDC}")
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# case ins.SGetObject(to=to, field=field):
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# print(f"{i:>03} {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"{i:>03} {inst}")
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#
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# new_code = Code(code.registers_size, code.ins_size, code.outs_size, new_insns)
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# dyn_load_apk.set_method_code(method_id, code)
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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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NB_APK = 8666
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print("[+] Potential methods:")
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for m_id, t in potential_meth:
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print(f" {m_id}({t})")
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m_id, t = potential_meth[0]
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new_insns = (
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code.insns[:42]
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+ [
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ins.NewInstance(1, IdType("Lcom/example/ut_dyn_load/SmsReceiver;")),
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ins.InvokeVirtual(m_id, [1, 8, 1]),
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]
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+ code.insns[62:]
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)
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print(f"[+] New code ")
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for i, inst in enumerate(new_insns):
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if i >= 42 and i < 44:
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print(f"{i:>03} {GREEN}{inst}{ENDC}")
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continue
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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"{i:>03} {RED}{inst}{ENDC}")
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case ins.SGetObject(to=to, field=field):
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print(f"{i:>03} {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"{i:>03} {inst}")
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new_code = Code(code.registers_size, code.ins_size, code.outs_size, new_insns)
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dyn_load_apk.set_method_code(method_id, code)
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list_cls = list(dyn_load_apk.classes.keys())
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list_cls.sort()
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print(f"[+] NB classes: {len(list_cls)}")
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for cls in list_cls[NB_APK:]:
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dyn_load_apk.remove_class(cls)
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print("[+] Recompile")
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dex_raw = dyn_load_apk.gen_raw_dex()
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print("[+] Repackage")
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utils.replace_dex(
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DYN_LOAD_APK,
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DYN_LOAD_APK.parent
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/ (DYN_LOAD_APK.name.removesuffix(".apk") + "-instrumented.apk"),
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dex_raw,
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Path(__file__).parent.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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# utils.replace_dex(
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# DYN_LOAD_APK,
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# DYN_LOAD_APK.parent
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# / (DYN_LOAD_APK.name.removesuffix(".apk") + "-instrumented.apk"),
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# dex_raw,
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# Path(__file__).parent.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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MAX_REQ = 3
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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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instrumented_apk = Apk()
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instrumented_apk.add_dex_file(dex_raw[0])
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cmp(instrumented_apk, dyn_load_apk)
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for i in range(NB_APK - 5, NB_APK + 5):
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print(f"{i}: {str(list_cls[i])}")
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