McAfee > Theat Center > Virus Detail Page

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.

Aliases

• TR/Dldr.Delf.CQ (H+BEDV)

• TROJ_DELF.IQ (Trend)

• Trojan-PSW.Win32.QQRob.13 (Kaspersky)

• Win32.QQRob.C (CA)

Characteristics

Detection was added to cover protection for a malicious file originally called "ntdhcp.exe " , having a filesize of 25712 bytes. The file is internally encrypted due to modifications with PEditor.

Upon running, it copies itself to the %windows\%system directory, for example on a win2000 system:

• c:\winnt\system32\ntdhcp.exe  , size: 25,712 bytes
  

To launch itself automatically upon system start it makes a registry modification under:

• HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "NTdhcp"
• with Data: C:\WINNT\System32\NTdhcp.exe
  

Symptoms

• Presence of file/filesize as mentioned above

Method of Infection

Trojans do not self-replicate. They spread manually, often under the premise that the executable is something beneficial. Trojans may also be received as a result of poor security practices, or unpatched machines and vulnerable systems. Distribution channels include IRC, peer-to-peer networks, email, newsgroups postings, etc.

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).

But in some particular cases, the following steps need to be taken.

Please go to the Microsoft Recovery Console and restore a clean MBR.

On Windows XP:

• Insert the Windows XP CD into the CD-ROM drive and restart the computer.
• When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
• Select the Windows installation that is compromised and provide the administrator password.
• Issue 'fixmbr' command to restore the Master Boot Record
• Follow onscreen instructions.
• Reset and remove the CD from CD-ROM drive.

On Windows Vista and 7:

• Insert the Windows CD into the CD-ROM drive and restart the computer.
• Click on "Repair Your Computer".
• When the System Recovery Options dialog comes up, choose the Command Prompt.
• Issue 'bootrec /fixmbr' command to restore the Master Boot Record.
• Follow onscreen instructions.
• Reset and remove the CD from CD-ROM drive.

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.

Aliases

• TR/Dldr.Delf.CQ (H+BEDV)

• TROJ_DELF.IQ (Trend)

• Trojan-PSW.Win32.QQRob.13 (Kaspersky)

• Win32.QQRob.C (CA)

Characteristics

Characteristics -

Detection was added to cover protection for a malicious file originally called "ntdhcp.exe " , having a filesize of 25712 bytes. The file is internally encrypted due to modifications with PEditor.

Upon running, it copies itself to the %windows\%system directory, for example on a win2000 system:

• c:\winnt\system32\ntdhcp.exe  , size: 25,712 bytes
  

To launch itself automatically upon system start it makes a registry modification under:

• HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "NTdhcp"
• with Data: C:\WINNT\System32\NTdhcp.exe
  

Symptoms

Symptoms -

• Presence of file/filesize as mentioned above

Method of Infection

Method of Infection -

Trojans do not self-replicate. They spread manually, often under the premise that the executable is something beneficial. Trojans may also be received as a result of poor security practices, or unpatched machines and vulnerable systems. Distribution channels include IRC, peer-to-peer networks, email, newsgroups postings, etc.

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).

But in some particular cases, the following steps need to be taken.

Please go to the Microsoft Recovery Console and restore a clean MBR.

On Windows XP:

• Insert the Windows XP CD into the CD-ROM drive and restart the computer.
• When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
• Select the Windows installation that is compromised and provide the administrator password.
• Issue 'fixmbr' command to restore the Master Boot Record
• Follow onscreen instructions.
• Reset and remove the CD from CD-ROM drive.

On Windows Vista and 7:

• Insert the Windows CD into the CD-ROM drive and restart the computer.
• Click on "Repair Your Computer".
• When the System Recovery Options dialog comes up, choose the Command Prompt.
• Issue 'bootrec /fixmbr' command to restore the Master Boot Record.
• Follow onscreen instructions.
• Reset and remove the CD from CD-ROM drive.

Variants

Variants -

N/A