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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.
Labs Note
  • Sucuri Labs
  • Website Malware Infections
  • Website Security

Naive CoinHive Injections

  • Denis Sinegubko
  • December 20, 2017
Since CoinHive domain made it into many blacklists, attackers began avoiding linking to the hosted library file https://coinhive .com/lib/coinhive.min.js. Instead, they uploaded this file to…
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Labs Note
  • Sucuri Labs
  • Website Malware Infections
  • WordPress Security

Reversed URLs Randomly Redirect to Scams

  • Denis Sinegubko
  • December 14, 2017
We are seeing hundreds of infected WordPress sites with the following scripts (in one line) injected in random places in wp_posts table. $vTB$I_919AeEAw2z$KX=function(n){if (typeof ($vTB$I_919AeEAw2z$KX.list[n])…
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  • Website Malware Infections
  • WordPress Security

Malicious Cryptominers from GitHub

  • Denis Sinegubko
  • December 7, 2017
Recently, a webmaster contacted us when his AVG antivirus reported that the JS:Miner-C [Trj] infection was found on their site. Our investigation revealed a hidden…
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  • Website Malware Infections
  • WordPress Security

Cloudflare[.]Solutions Keylogger on Thousands of Infected WordPress Sites

  • Denis Sinegubko
  • December 6, 2017
Update Dec. 8 2017: The cloudflare[.]solutions domain has now been taken down. A few weeks ago, we wrote about a massive WordPress infection that injected an…
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Labs Note
  • Sucuri Labs
  • Website Malware Infections
  • WordPress Security

WP-VCD Malware Comes with Nulled Themes

  • Denis Sinegubko
  • December 6, 2017
Recently we wrote about wp-vcd malware that created rogue WordPress admin users (100010010) and injected spam links. Our readers noticed that the “nulled” premium theme…
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Labs Note
  • Sucuri Labs
  • Website Malware Infections
  • Website Security

Fake jQuery and Google Analytics Hide Yet Another Cryptominer

  • Denis Sinegubko
  • November 24, 2017
This is a quick posts about yet another quite massive attack that installs CoinHive JavaScript Monero miners on compromised websites. You might have already read…
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cryptominers on hacked sites blog header
  • Drupal Security
  • Joomla Security
  • Magento Security
  • Website Malware Infections
  • WordPress Security

Cryptominers on Hacked Sites – Part 2

  • Denis Sinegubko
  • October 25, 2017
Last month we wrote about how the emergence of website cryptocurrency miners resulted in hackers abusing the technology by injecting the CoinHive miners into compromised…
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hacked website mine cryptocurrencies blog header
  • Security Advisory
  • Website Security

Hacked Websites Mine Cryptocurrencies

  • Denis Sinegubko
  • September 22, 2017
Cryptocurrencies are all the rage now. Bitcoin, altcoins, blockchain, ICO, mining farms, skyrocketing exchange rates – you see or hear this every day in the…
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abandoned scripts and pitfalls of cleaning serialized data blog post header
  • Security Advisory
  • WordPress Security

Old Themes, Abandoned Scripts and Pitfalls of Cleaning Serialized Data

  • Denis Sinegubko
  • September 13, 2017
Over the summer, we’ve seen waves of WordPress database infections that use vulnerabilities in tagDiv’s Newspaper/Newsmag themes or InterconnectIT Search and Replace scripts (searchreplacedb2.php). The…
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Amazon affiliate cookie stuffing in iFrames
  • Website Security

Affiliate Cookie Stuffing in iFrames

  • Denis Sinegubko
  • September 5, 2017
Inline frames (iFrames) are an easy way to embed content from another site onto your own. This element allows you to insert another document inside…
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  • Security Education
  • Website Security

Mining Adminers – Hackers Scan the Internet For DB Scripts

  • Denis Sinegubko
  • August 30, 2017
Hackers are constantly scanning the internet for exploitable sites, which is why even small, new sites should be fully patched and protected. At the same…
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