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Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Downloader.IRO

Threat LevelHigh threatDamageSevereDistributionNot widespread
Common name:Downloader.IRO
Technical name:Trj/Downloader.IRO
Threat level:Medium
Alias:Packed.Win32.Tibs
Type:Trojan
Effects:   It allows to get into the affected computer. It generates a large amount of network traffic activity with the consequent consumption of bandwidth. It opens one or more ports to allow remote access to the computer. It downloads files from several websites. It uses anti-monitoring techniques in order to prevent it being detected by antivirus companies. It spreads , across the Internet.
Affected platforms:

Windows 2003/XP/2000/NT/ME/98/95

First detected on:April 28, 2006
Detection updated on:April 28, 2006
StatisticsNo
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 

    

Downloader.IRO is a Trojan, which although seemingly inoffensive, can actually carry out attacks and intrusions.

 

  • In the local network: it generates a large amount of network activity and consumes bandwidth.

 

It reduces the security level of the computer: it opens one or more ports to allow remote access to the computer and takes action that compromises user confidentiality.

 

Downloader.IRO accesses several websites to download files, which it then runs. These can be any type of file, although they are normally malware.

 

It uses several methods in order to avoid detection by antivirus companies:

  • It terminates its own execution if it detects that it is being executed in a virtual machine environment, such as VMWare or VirtualPC.

 

Downloader.IRO uses the following propagation or distribution methods:

  • Exploiting vulnerabilities with the intervention of the user: exploiting vulnerabilities in file formats or applications. To exploit them successfully it needs the intervention of the user: opening files, viewing malicious web pages, reading emails, etc.
  • Via Internet, exploiting remote vulnerabilities: attacking random IP addresses, in which it tries to insert a copy of itself by exploiting one or more vulnerabilities.

 

Visible Symptoms

 

Downloader.IRO is easy to recognize, as it shows the following symptoms:

  • It displays false error messages when it is run.