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Overview

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.

Characteristics

This trojan is a dll component of the Puper trojan. This component is responsible for the browser monitoring behavior of the puper trojan.

For further information, please refer to the Puper description.

System Changes

Files Added

• %SystemDir%\ncompat.tlb (trojan data file)
  

Registry

The following registry keys are created:

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
  \Explorer\Browser Helper Objects\{893fad3a-931e-4e53-b515-b1426d63799b}
  "default"=""
  
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
  \Explorer\Browser Helper Objects\{893fad3a-931e-4e53-b515-b1426d63799b}
  
• HKEY_CLASSES_ROOT\CLSID\{893FAD3A-931E-4E53-B515-B1426D63799B}
  \InprocServer32
  "ThreadingModel"="Apartment"
  
• HKEY_CLASSES_ROOT\CLSID\{893FAD3A-931E-4E53-B515-B1426D63799B}
  \InprocServer32
  "(default)"="%systemdir%\hp5f51.dll"
  
• HKEY_CLASSES_ROOT\CLSID\{893FAD3A-931E-4E53-B515-B1426D63799B}
  "default"="HomepageBHO"
  

Symptoms

Presence of the files and registry entries referenced above.

Method 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.  However they may themselves be downloaded by other viruses and/or Trojans to be installed on the user's system. 

Many of these additionally are mass spammed by the author to entice people into double-clicking on them. 

Alternatively they may be installed by visiting a malicious web page (either by clicking on a link, or by the website hosting a scripted exploit which installs the trojan onto the user's system with no user interaction.

Removal

All Users:
Use current engine and DAT files for detection and removal.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

Additional Windows ME/XP removal considerations

Variants

Variants

N/A

All Information

Overview -

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.

Characteristics

Characteristics -

This trojan is a dll component of the Puper trojan. This component is responsible for the browser monitoring behavior of the puper trojan.

For further information, please refer to the Puper description.

System Changes

Files Added

• %SystemDir%\ncompat.tlb (trojan data file)
  

Registry

The following registry keys are created:

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
  \Explorer\Browser Helper Objects\{893fad3a-931e-4e53-b515-b1426d63799b}
  "default"=""
  
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
  \Explorer\Browser Helper Objects\{893fad3a-931e-4e53-b515-b1426d63799b}
  
• HKEY_CLASSES_ROOT\CLSID\{893FAD3A-931E-4E53-B515-B1426D63799B}
  \InprocServer32
  "ThreadingModel"="Apartment"
  
• HKEY_CLASSES_ROOT\CLSID\{893FAD3A-931E-4E53-B515-B1426D63799B}
  \InprocServer32
  "(default)"="%systemdir%\hp5f51.dll"
  
• HKEY_CLASSES_ROOT\CLSID\{893FAD3A-931E-4E53-B515-B1426D63799B}
  "default"="HomepageBHO"
  

Symptoms

Symptoms -

Presence of the files and registry entries referenced above.

Method of Infection

Method 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.  However they may themselves be downloaded by other viruses and/or Trojans to be installed on the user's system. 

Many of these additionally are mass spammed by the author to entice people into double-clicking on them. 

Alternatively they may be installed by visiting a malicious web page (either by clicking on a link, or by the website hosting a scripted exploit which installs the trojan onto the user's system with no user interaction.

Removal -

Removal -

All Users:
Use current engine and DAT files for detection and removal.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

Additional Windows ME/XP removal considerations

Variants

Variants -

N/A