Close
  • Latest News
  • Big Data and Analytics
  • Cloud
  • Networking
  • Cybersecurity
  • Applications
  • IT Management
  • Storage
  • Sponsored
  • Mobile
  • Small Business
  • Development
  • Database
  • Servers
  • Android
  • Apple
  • Innovation
  • Blogs
  • PC Hardware
  • Reviews
  • Search Engines
  • Virtualization
Read Down
Sign in
Close
Welcome!Log into your account
Forgot your password?
Read Down
Password recovery
Recover your password
Close
Search
Logo
Logo
  • Latest News
  • Big Data and Analytics
  • Cloud
  • Networking
  • Cybersecurity
  • Applications
  • IT Management
  • Storage
  • Sponsored
  • Mobile
  • Small Business
  • Development
  • Database
  • Servers
  • Android
  • Apple
  • Innovation
  • Blogs
  • PC Hardware
  • Reviews
  • Search Engines
  • Virtualization
More
    Home Cybersecurity
    • Cybersecurity

    Cryzip Trojan Encrypts Files, Demands Ransom

    By
    Ryan Naraine
    -
    March 13, 2006
    Share
    Facebook
    Twitter
    Linkedin

      Virus hunters have discovered a new Trojan that encrypts files on an infected computer and then demands $300 in ransom for a decryption password.

      The Trojan, identified as Cryzip, uses a commercial zip library to store the victims documents inside a password-protected zip file and leaves step-by-step instructions on how to pay the ransom to retrieve the files.

      It is not yet clear how the Trojan is being distributed, but security researchers say it was part of a small e-mail spam run that successfully evaded anti-virus scanners by staying below the radar.

      /zimages/6/28571.gifSunbelt tracks a DIY Trojan-builder program. Click here to read more.

      While this type of attack, known as “ransomware,” is not entirely new, it points to an increasing level of sophistication among online thieves who use social engineering tactics to trick victims into installing malware, said Shane Coursen, senior technical consultant at Moscow-based anti-virus vendor Kaspersky Lab.

      The LURHQ Threat Intelligence Group, based in Chicago, was able to crack the encryption code used in the Cryzip Trojan and determine how the files are encrypted and the payment mechanism that has been set up to collect the $300 ransom.

      According to a LURHQ advisory, Cryzip searches an infected hard drive for a wide range of widely used file types, including Word, Excel, PDF and JPG images.

      Once commandeered, the files are zipped and overwritten the text: “Erased by Zippo! GO OUT!!!”

      The Trojan then deletes all the files, leaving only the encrypted file with the original file name, followed by the “_CRYPT.ZIP” extension.

      A new directory named “AUTO_ZIP_REPORT.TXT” is created with specific instructions on how to use the E-Gold online currency and payment system to send ransom payments.

      The instructions, which are marked by misspellings and poor grammar, contain the following text: “Your computer catched our software while browsing illigal porn pages, all your documents, text files, databases was archived with long enought password. You can not guess the password for your archived files – password lenght is more then 10 symbols that makes all password recovery programs fail to bruteforce it (guess password by trying all possible combinations).”

      /zimages/6/28571.gifFor advice on how to secure your network and applications, as well as the latest security news, visit Ziff Davis Internets Security IT Hub.

      The owner of the infected machine is warned not to search for the program that encrypted the data, claiming that it simply doesnt exist on the hard drive.

      “If you really care about documents and information in encrypted files you can pay using electonic currency $300,” the note says. “Reporting to police about a case will not help you, they do not know password. Reporting somewhere about our E-Gold account will not help you to restore files. This is your only way to get yours files back.”

      /zimages/6/84833.gifZiff Davis Media eSeminars invite: Learn how to proactively shield your organizations against threats at all tiers of the network, Symantec will show you how, live on March 21 at 4 p.m. ET. Sponsored by Symantec.

      The Trojan author uses scores of E-Gold accounts simultaneously to get around potential shutdowns, according to LURHQ, which published the complete list of E-Gold accounts in the advisory.

      Officials from E-Gold, which operates out of the Caribbean island of Nevis, were not available for comment.

      “Infection reports are not widespread, so it is not believed this is a mass threat by any means,” LURHQ said. However, the company said social engineering malware is typically more successful when it is delivered in low volume to get around anti-virus detections.

      “[M]ore attention means the likely closing of the accounts used for the anonymous money transfer,” LURHQ said.

      /zimages/6/28571.gifCheck out eWEEK.coms for the latest security news, reviews and analysis. And for insights on security coverage around the Web, take a look at eWEEK.com Security Center Editor Larry Seltzers Weblog.

      Ryan Naraine

      MOST POPULAR ARTICLES

      Big Data and Analytics

      Alteryx’s Suresh Vittal on the Democratization of...

      James Maguire - May 31, 2022 0
      I spoke with Suresh Vittal, Chief Product Officer at Alteryx, about the industry mega-shift toward making data analytics tools accessible to a company’s complete...
      Read more
      Cybersecurity

      Visa’s Michael Jabbara on Cybersecurity and Digital...

      James Maguire - May 17, 2022 0
      I spoke with Michael Jabbara, VP and Global Head of Fraud Services at Visa, about the cybersecurity technology used to ensure the safe transfer...
      Read more
      Big Data and Analytics

      GoodData CEO Roman Stanek on Business Intelligence...

      James Maguire - May 4, 2022 0
      I spoke with Roman Stanek, CEO of GoodData, about business intelligence, data as a service, and the frustration that many executives have with data...
      Read more
      Applications

      Cisco’s Thimaya Subaiya on Customer Experience in...

      James Maguire - May 10, 2022 0
      I spoke with Thimaya Subaiya, SVP and GM of Global Customer Experience at Cisco, about the factors that create good customer experience – and...
      Read more
      Cloud

      Yotascale CEO Asim Razzaq on Controlling Multicloud...

      James Maguire - May 5, 2022 0
      Asim Razzaq, CEO of Yotascale, provides guidance on understanding—and containing—the complex cost structure of multicloud computing. Among the topics we covered:  As you survey the...
      Read more
      Logo

      eWeek has the latest technology news and analysis, buying guides, and product reviews for IT professionals and technology buyers. The site’s focus is on innovative solutions and covering in-depth technical content. eWeek stays on the cutting edge of technology news and IT trends through interviews and expert analysis. Gain insight from top innovators and thought leaders in the fields of IT, business, enterprise software, startups, and more.

      Facebook
      Linkedin
      RSS
      Twitter
      Youtube

      Advertisers

      Advertise with TechnologyAdvice on eWeek and our other IT-focused platforms.

      Advertise with Us

      Menu

      • About eWeek
      • Subscribe to our Newsletter
      • Latest News

      Our Brands

      • Privacy Policy
      • Terms
      • About
      • Contact
      • Advertise
      • Sitemap
      • California – Do Not Sell My Information

      Property of TechnologyAdvice.
      © 2021 TechnologyAdvice. All Rights Reserved

      Advertiser Disclosure: Some of the products that appear on this site are from companies from which TechnologyAdvice receives compensation. This compensation may impact how and where products appear on this site including, for example, the order in which they appear. TechnologyAdvice does not include all companies or all types of products available in the marketplace.

      ×