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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Retvorp.A

Threat LevelLow threatDamageHighDistributionNot widespread
Common name:Retvorp.A
Technical name:Rootkit/Retvorp.A
Threat level:Medium
Alias:Trojan.Win32.Inject.bte,
Type:Hacking Tool
Effects:   It allows to carry out dangerous actions for the victims of attacks.
Affected platforms:

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

First detected on:May 22, 2008
Detection updated on:May 22, 2008
StatisticsNo

Brief Description 

    

Retvorp.A is a rootkit. These are programs used to hide files, Windows Registry entries or processes, either their own or those of other programs.

In this way, even when a user looks for these items on a computer, they won't be able to see them.

Rootkits have been widely used for malicious ends, to camouflage other programs on computers that have previously been compromised through other means.

There are certain examples of malware that use rootkits in order to go unnoticed on the computer they have infected.

 

Retvorp.A is designed to affect one or more specific companies.

 

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

 

It uses stealth techniques to avoid being detected by the user:

  • It injects itself in running processes.

 

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

  • It prevents scanning tools from running, such as Windows Registry Editor, FileMonitor, etc.
  • It terminates its own execution if it detects that a memory dump program is running, such as Procdump.

 

Retvorp.A does not spread automatically using its own means. It needs an attacking user's intervention in order to reach the affected computer. The means of transmission used include, among others, floppy disks, CD-ROMs, email messages with attached files, Internet downloads, FTP, IRC channels, peer-to-peer (P2P) file sharing networks, etc.