SOURCE: BitDefender


September 30, 2010 09:00 ET

Autorun Malware Dominates BitDefender's Third Quarter Top Five E-Threat Report

Spreading Through Removable Devices and Shared Folders, Autorun Trojan Takes the Top Spot; Harmful Newcomer Also Makes Its Way in the Top Five via the Backdoor

BUCHAREST, ROMANIA--(Marketwire - September 30, 2010) -  BitDefender®, an award-winning provider of innovative internet security solutions, today announced the Top Five E-Threats for the third quarter of 2010.

The top ranking e-threat, with 11 percent of the total infections in the world, is Trojan.AutorunINF.Gen. This piece of malware is consistently among the most "popular" threats each month as it easily spreads via removable devices and Windows® shared folders. The Windows® Autorun feature is exploited by malware authors to force the execution of dangerous files located on infected USB drives.

Ranking second is Win32.Worm.Downadup.Gen with six percent of the total infections in the world. This worm, also making use of the autorun feature, typically appears in the malware distribution charts alongside Trojan.AutorunInf.Gen. Computer users should always scan external devices especially after having plugged them into public computers like those available in copy shops and libraries. Since Microsoft® has patched this vulnerability in Windows® Vista® and Windows® 7, users simply need to update their operating systems and antivirus solutions in order to stay safe.

Third through fifth place are closely contested. This quarter the third spot includes a representative of the exploit family, namely Exploit.PDF-JS.Gen. This generic detection deals with malformed PDF files exploiting different vulnerabilities found in the Javascript engine of Adobe® PDF Reader® with the purpose of executing further malicious code on users' computers.

A newcomer to the top five, and occupying the fourth place is Trojan.Generic.4170878 is a newcomer with great "negative" potential. This backdoor provides the cybercriminal remote access to the infected system. Unfortunately for users, this piece of malware has seen a steady rise in distribution over the past few months.

Ranking fifth in the quarterly malware chart, with three percent, is Trojan.Wimad.Gen.1. This e-threat is mostly found on Torrent websites, camouflaged as episodes of your favorite series or as a not-yet-aired but soon-to-be blockbuster. These counterfeit video files connect to a specific URL and download malware, impersonating the appropriate codec or video player required in order to watch the file. Trojan.Wimad.Gen.1 is mostly active before or immediately after box-office premieres. Its presence in this quarter's chart is a certain sign of increased movie piracy via peer-to-peer download websites.

The BitDefender July - September 2010 Top 10 E-Threat list includes:

  1. Trojan.AutorunINF.Gen 10.84%
  2. Win32.Worm.Downadup.Gen 5.61%
  3. Exploit.PDF-JS.Gen 3.40%
  4. Trojan.Generic.4170878 3.13%
  5. Trojan.Wimad.Gen.1 3.08%
  6. Win32.Sality.OG 2.85%
  7. Trojan.Autorun.AET 2.06%
  8. Gen:Variant.Hiloti.1 1.93%
  9. Worm.Autorun.VHG 1.91%
  10. Exploit.CplLnk.Gen 1.61%
  Other 63.59%

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About BitDefender®
BitDefender is the creator of one of the industry's fastest and most effective lines of internationally certified security software. Since its inception in 2001, BitDefender has continued to raise the bar and set new standards in proactive threat prevention, emerging as the industry's anti-malware innovator. Every day, BitDefender protects tens of millions of home and corporate users across the globe -- giving them the peace of mind of knowing that their digital experiences will be secure. BitDefender solutions are distributed by a global network of value-added distribution and reseller partners in more than 100 countries worldwide. More information about BitDefender and its products are available at the company's security solutions press room. More information is available at

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