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udp_injector.js
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udp_injector.js
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const xp1 = 0x3243FC; // udp connection
const xp2 = 0x323AFC; // udp send message (first one)
const xp3 = 0x323A20; // udp pre-send (all)
const xp4 = 0x33C2F6; // possible rc4
const xp5 = 0x324980; // udp send 1 (subsequent packet)
const xp6 = 0x3248C0; // udp send 2 (used only on first packed)
function ba2hex(bufArray) {
var uint8arr = new Uint8Array(bufArray);
if (!uint8arr) {
return '';
}
var hexStr = '';
for (var i = 0; i < uint8arr.length; i++) {
var hex = (uint8arr[i] & 0xff).toString(16);
hex = (hex.length === 1) ? '0' + hex : hex;
hexStr += hex;
}
return hexStr.toUpperCase();
}
function packetize(payload) {
var packet = {
sessionKey: payload.substring(0, 20),
ack: null,
contentMessage: null
};
payload = payload.substring(20);
while (payload.length !== 0) {
if (packet.ack === null) {
var ack = parseInt(payload.substring(0, 2));
packet.ack = {};
payload = subs(payload, 2);
if (ack > 0) {
packet.ack.ack = parseInt("0x" + payload.substring(0, 2));
payload = subs(payload, 2);
}
} else if (packet.contentMessage === null) {
var msg = parseInt(payload.substring(0, 2));
packet.contentMessage = {};
payload = subs(payload, 2);
if (msg > 0) {
packet.contentMessage.ack = parseInt("0x" + payload.substring(0, 2));
payload = subs(payload, 2);
packet.contentMessage.msgId = parseInt("0x" + payload.substring(0, 4));
payload = subs(payload, 4);
if (payload.length > 0) {
msg = parseInt(payload.substring(0, 2));
payload = subs(payload, 2);
if (msg > 0) {
var encMsgLen = parseInt("0x" + payload.substring(0, 2));
payload = subs(payload, 2);
packet.contentMessage.encryptedPayload =
payload.substring(0, encMsgLen * 2);
payload = subs(payload, encMsgLen * 2);
}
}
}
} else {
packet.extraBytes = payload;
payload = subs(payload, payload.length);
}
}
console.log(JSON.stringify(packet));
}
function subs(str, start) {
return str.substring(start);
}
function inject() {
Process.enumerateModules({
onMatch: function (module) {
if (module.name === "libg.so") {
var base = module.base;
var pt1 = ptr(parseInt(base) + 1 + xp5);
var pt2 = ptr(parseInt(base) + 1 + xp6);
var sessionId = null;
Interceptor.attach(pt1, {
onEnter: function (args) {
console.log("UDP SEND 1");
var p = ba2hex(Memory.readByteArray(ptr(parseInt(args[0]) + 1410), 64));
console.log(p);
},
onLeave: function (retval) {
}
});
Interceptor.attach(pt2, {
onEnter: function (args) {
console.log("UDP SEND 2");
var p = ba2hex(Memory.readByteArray(ptr(parseInt(args[0]) + 1410), 64));
if (sessionId === null) {
sessionId = p.substring(0, 10);
}
console.log(p);
},
onLeave: function (retval) {
}
});
Interceptor.attach(Module.findExportByName("libg.so", "sendto"), {
onEnter: function (args) {
if (sessionId !== null) {
var p = ba2hex(Memory.readByteArray(args[1], parseInt(args[2])));
if (p.startsWith(sessionId)) {
console.log("SEND");
packetize(p);
}
}
},
onLeave: function (retval) {
}
});
var recvPtr;
Interceptor.attach(Module.findExportByName("libg.so", "recvfrom"), {
onEnter: function (args) {
recvPtr = args[1];
},
onLeave: function (retval) {
if (sessionId !== null) {
var p = ba2hex(Memory.readByteArray(recvPtr, parseInt(retval)));
if (p.startsWith(sessionId)) {
console.log("RECV");
packetize(p);
}
}
}
});
}
},
onComplete: function () {
}
});
}
inject();