看雪会员『至尊小仙侠』写的《大杀器Unidbg真正的威力》让我们认识到Unidbg强大,今天我们一起回顾一下吧
论2021如何处理 arm vmp?
public final Number[] callFunction(Emulator<?> emulator, String symbolName, Object... args) {
Symbol symbol = findSymbolByName(symbolName, false);
if (symbol == null) {
throw new IllegalStateException("find symbol failed: " + symbolName);
}
if (symbol.isUndef()) {
throw new IllegalStateException(symbolName + " is NOT defined");
}
return symbol.call(emulator, args);
}
emulator = createARMEmulator();
private static void CallVMPFunc(Module module,AndroidEmulator emulator){
try {
Symbol malloc = module.findSymbolByName("malloc");
Symbol free = module.findSymbolByName("free");
MemoryBlock block = MemoryAllocBlock.malloc(emulator,malloc,free,0x1000);
MemoryBlock namebyte = MemoryAllocBlock.malloc(emulator,malloc,free,0x1000);
UnidbgPointer blockpoint = block.getPointer();
UnidbgPointer namepoint = namebyte.getPointer();
String name = "magicillusion";
String data = "hello worid";
namepoint.write(name.getBytes());
blockpoint.write(data.getBytes());
Number[] ret = module.callFunction(emulator,0x13B30+1,namepoint,blockpoint,2);
UnidbgPointer ret1 = new UnidbgPointer(emulator,ret[0].intValue(),4);
String string = ret1.getString(0);
System.out.println("Number => " + (string));
} finally {
}
}
// 1. 获取HookZz对象
IHookZz hookZz = HookZz.getInstance(emulator); // 加载HookZz,支持inline hook,文档看https://github.com/jmpews/HookZz
// 2. enable hook
hookZz.enable_arm_arm64_b_branch(); // 测试enable_arm_arm64_b_branch,可有可无
index = 0;
hookZz.replace(module.findSymbolByName("lrand48"), new ReplaceCallback() {
@Override
public void postCall(Emulator<?> emulator, HookContext context) {
((EditableArm32RegisterContext)context).setR0(0x12345678);
int ptrace_args0 = context.getIntArg(0);
System.out.println("lrand48=" + ptrace_args0);
}
},true);
//aesdecode hook
hookZz.wrap((module.base)+0x39634+1, new WrapCallback<RegisterContext>() { // inline wrap导出函数
UnidbgPointer addr = null;
@Override
// 4. 方法执行前
public void preCall(Emulator<?> emulator, RegisterContext ctx, HookEntryInfo info) {
addr= ctx.getPointerArg(0);
UnidbgPointer pointerArg = ctx.getPointerArg(1);
UnidbgPointer pointer = pointerArg.getPointer(12);
int anInt = pointerArg.getInt(8);
byte[] byteArray = pointer.getByteArray(0, anInt);
String s =xuzi1(byteArray);
System.out.println("aes aesdecode= " + s);
}
@Override
// 5. 方法执行后
public void postCall(Emulator<?> emulator, RegisterContext ctx, HookEntryInfo info) {
byte[] aaaa = addr.getPointer(0).getPointer(12).getByteArray(0,0x30);
String s =xuzi1(aaaa);
System.out.println("aes aesdecode1= " + s);
}
});
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