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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Dialer.HAH

Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Dialer.HAH
Technical name:Dialer.HAH
Threat level:Low
Type:Dialer
Effects:   It establishes a phone connection with a high rate number. It affects the productivity of the computer, the network to which it’s connected or other remote sites. It carries out actions that decrease the security level of the computer. It downloads files from several websites. It uses stealth techniques to avoid being detected by the user. It spreads , across the Internet.
Affected platforms:

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

First detected on:April 24, 2006
Detection updated on:April 24, 2006
StatisticsNo
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 

    

Dialer.HAH is a dialer type malware. Dialers usually try to establish phone connections with high rate numbers, significantly increasing the phone bill of the affected user.

Dialer.HAH affects computers that use a modem to connect to the Internet, as the virus modifies the Dial-up network access settings. It changes the telephone number provided by the ISP (Internet Service Provider), which is a local-rate number, to a high-rate number.

 

It affects productivity, preventing tasks from being carried out:

  • In the affected computer: it displays pop-up windows; causes system slowdowns; it converts the computer into a platform for taking malicious action surreptitiously: spam sending, launch of Denial of Service attacks, malware distribution, etc.

 

It reduces the security level of the computer: it changes the security settings of Internet Explorer, decreasing its security level; it opens one or more ports to allow remote access to the computer and takes action that compromises user confidentiality.

 

Dialer.HAH 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 modifies system permissions in order to hide itself.

 

Dialer.HAH 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

 

Dialer.HAH is easy to recognize, as it shows the following symptoms:

  • It creates shortcuts in the Windows Desktop.
  • It installs icons in the System Tray.