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@eybisi
Last active Nov 3, 2022
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frida script to find imposter (amongus 2020.9.9 arm64-v8a)
import { log } from "./logger";
import { AssertionError } from "assert";
const libil2cpp = Process.getModuleByName("libil2cpp.so");
const libil2cppb = libil2cpp.base;
const playerinfo_serialize = libil2cppb.add(0x6c2e30);
const playerinfo_deserialize = libil2cppb.add(0x6c316c);
console.log("Starting script..");
function readString(pointr:NativePointer){
let length = pointr.add(16).readInt()
const stringBytes = pointr.add(20).readByteArray(length*2)
if(stringBytes instanceof ArrayBuffer){
const view = new Uint16Array(stringBytes)
return String.fromCharCode.apply(null,[...view])
}
return "Cant read"
}
function processPlayerInfo(rawPlayer: NativePointer) {
const buffer = rawPlayer.readByteArray(0x41);
const playername_ptr = rawPlayer.add(0x18).readPointer()
const playername = readString(playername_ptr)
if (buffer instanceof ArrayBuffer) {
const playerInfoView = new DataView(buffer);
const player = {
PlayerId: playerInfoView.getInt8(0x10),
PlayerName: playername, //0x18
ColorId: playerInfoView.getInt32(0x20, true),
HatId: playerInfoView.getInt16(0x24, true),
PetId: playerInfoView.getInt16(0x28, true),
SkinId: `0x${playerInfoView.getInt16(0x2c, true).toString(16)}`,
Disconnected: `0x${playerInfoView.getInt32(0x30, true).toString(16)}`,
Tasks: playerInfoView.getInt32(0x38, true),
IsImpostor: playerInfoView.getInt8(0x40),
};
console.log("[+] Player Serialize");
console.log(JSON.stringify(player,null,"-- "))
}
}
Interceptor.attach(playerinfo_serialize, {
onEnter: function (args) {
const rawPlayer = args[0];
processPlayerInfo(rawPlayer);
// console.log(
// hexdump(rawPlayer.add(0x20), {
// offset: 0,
// length: 0x50,
// header: true,
// ansi: true,
// })
// );
},
onLeave: retval => {},
});
Interceptor.attach(playerinfo_deserialize, {
onEnter: function (args) {
//save playerInfo pointer
this.pInfo = args[0];
},
onLeave: function (retval) {
if(this.pInfo instanceof NativePointer){
//playerInfo deserialized into pInfo
processPlayerInfo(this.pInfo);
}
},
});
@KathanP19
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KathanP19 commented Sep 28, 2020

PS D:\Root> frida -U --no-pause -l .\amongus.js com.innersloth.spacemafia                                                    ____
    / _  |   Frida 12.11.17 - A world-class dynamic instrumentation toolkit
   | (_| |
    > _  |   Commands:
   /_/ |_|       help      -> Displays the help system
   . . . .       object?   -> Display information about 'object'
   . . . .       exit/quit -> Exit
   . . . .
   . . . .   More info at https://www.frida.re/docs/home/
Failed to load script: script(line 1): SyntaxError: parse error

Thank you for using Frida!

got this error

@eybisi
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eybisi commented Sep 28, 2020

@KathanP19
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KathanP19 commented Sep 29, 2020

PS D:\Root\frida-agent-example> frida -U --no-pause -l .\_agent.js com.innersloth.spacemafia                                 ____
    / _  |   Frida 12.11.17 - A world-class dynamic instrumentation toolkit
   | (_| |
    > _  |   Commands:
   /_/ |_|       help      -> Displays the help system
   . . . .       object?   -> Display information about 'object'
   . . . .       exit/quit -> Exit
   . . . .
   . . . .   More info at https://www.frida.re/docs/home/

Error: unable to find module 'libil2cpp.so'
    at frida/runtime/core.js:345
    at agent/index.ts:4
    at o (node_modules/browser-pack/_prelude.js:1)
    at r (node_modules/browser-pack/_prelude.js:1)
    at /_agent.js:1414

this is the new error

@eybisi
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eybisi commented Oct 5, 2020

This is because when you start the app libil2cpp is not loaded. You should start the game then load frida script

@ricardozv
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ricardozv commented Nov 3, 2022

Frida version 15.2.2
frida-server-15.0.7-android-x86_64

Happens to me when I run this command
Frida version 15.2.2
frida -U -f br.com.brainweb.name -l jsInjection.js --no-pause
____
/ _ | Frida 15.2.2 - A world-class dynamic instrumentation toolkit
| (| |
> _ | Commands:
/
/ |_| help -> Displays the help system
. . . . object? -> Display information about 'object'
. . . . exit/quit -> Exit
. . . .
. . . . More info at https://frida.re/docs/home/
. . . .
. . . . Connected to Android Emulator 5554 (id=emulator-5554)
Failed to load script: script(line 1): SyntaxError: unexpected character

Thank you for using Frida!

My script jsInjection.js
java.perform( function () {
console.log(' ');
console.log(' Silva Silva');

});

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