Outbreak Alert – Backdoor.Win32.ZAccess

Outbreak Alerts by StopSign Internet Security let you know when specific malware infections are trending, describe what they do, and provide tips on how to avoid them.

What Backdoor.Win32.ZAccess Does:

  • Downloads Malicious Rogue Anti-Virus Packages
  • Significantly Slows Down the Infected Machine
  • Displays False Error Messages
  • Restricts Access to Various System Functions

How It Infects:

  • Can be distributed by any means, including but not limited to: Email attachments, instant message attachments, infected websites, infected media or document files, peer-to-peer file sharing networks, or even downloaded by other malware;
  • Infection can also be found in hyperlinks to infected websites from email, instant messages, and social networking messages or posts.

How To Avoid Infection:

  • Use extreme caution when you receive a link or attachment from anyone, even those you know;
  • Do not download unknown files or files from unknown sources;
  • If using StopSign Internet Security, be sure the On-Access Scan is installed and enabled;
  • Scan all downloaded files with a malware threat scanner, such as StopSign Internet Security, before executing them;
  • Ensure that all updates are installed from Microsoft Update to help protect against vulnerabilities in the operating system.

Type: Downloader

Technical Name: Trojan.Win32.Medfos.m


  • W32/Zaccess.AP.gen!Eldorado
  • Trojan.DownLoader8.14961
  • Trojan-Dropper.Win32.Sirefef
  • Rootkit.0Access.Gen
  • Trojan.Generic.KDZ.9841

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About Anthony

Anthony is a 30-something software engineer living in the San Francisco Bay Area. Formerly of The Ohio State University (O-H-I-O!) where his focus included physics and electromechanical engineering, he had spent most of his youth abroad and later spent several years in Seattle, Washington as well as Cambridge, Massachusetts. In the few hours during the day not spent front of a large array of test computers, he devotes his free time to private catering and photography shoots, practicing archery and fencing, and gazing longingly at Mars, which he hopes will be his home in 2023.