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Virus Profile: Downloader-HI

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 8/25/2004
Date Added: 4/26/2004
Origin: Unknown
Length: 35,840
Type: Trojan
Subtype: Downloader
DAT Required: 4326
Removal Instructions
   
 
 
   

Description

This is a trojan detection. Unlike viruses, trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include email, malicious or hacked web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Indication of Infection

Presence of the file and registry entry mentioned above.

Methods of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, etc. 
   

Virus Characteristics

This is a trojan that downloads and executes other program from the internet.  At the time of testing, remote files were not available for downloading.

It makes several copies of itself to Windows system directory using following file name:

  • dllhlp.exe


The following registry key is created so that host32.exe is executed after each RESTART.

  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
    Run "dllhelp"= c:\winnt\dllhlp.exe


The following registry entries were made:

  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    "Search Bar" = http://youriskalka.com/sp.htm
  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    "Use Search Asst"= no
  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchUrl
    (Default) = http://youriskalka.com/index.htm
  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    "Search Bar" = http://youriskalka.com/sp.htm
  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    "Use Search Asst"= no
  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchUrl
    (Default) = http://youriskalka.com/index.htm
  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    "Use Search Asst"= no

  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchUrl
    (Default) = http://youriskalka.com/index.htm

   
Use current engine and DAT files for detection and removal.Removal requires removing the entry in the SYSTEM.INI file and restart to MS-DOS mode to delete the file manually from the Windows and Windows\System folders.