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frida script to find imposter (amongus 2020.9.9 arm64-v8a)
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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); | |
} | |
}, | |
}); |
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