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.

Characteristics

This detection is for a remote access trojan that is dropped and executed by W32/Blaster.worm.k .

Installation

Upon execution, the trojan installs itself into the %SYSDIR% directory as svchosthlp.exe .

For example:

C:\WINNT\system32\svchosthlp.exe

The following Registry key is added to hook system startup:

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "MSUpdate" = %SYSDIR%\svchosthlp.exe

The following registry keys are also added:

• HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control "Sysuser"
• HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control "Sysuser"
• HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control "Sysuser"

The user's startpage of the browser is changed to the following URL by modifying the registry at the following place:

• HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main "Start Page" = http://www.getgood.biz

Remote Access Functionality

Once running on the victim machine, a random port is opened on the infected system. The port numbers observed during testing were: 27507, 24367, 25519.

Mapped drives on the infected system were removed as well

Symptoms

• Unusual ports are opened
• Existence of the files/Registry keys detailed 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, email, etc.

Removal

All Users:
Use specified 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 detection is for a remote access trojan that is dropped and executed by W32/Blaster.worm.k .

Installation

Upon execution, the trojan installs itself into the %SYSDIR% directory as svchosthlp.exe .

For example:

C:\WINNT\system32\svchosthlp.exe

The following Registry key is added to hook system startup:

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "MSUpdate" = %SYSDIR%\svchosthlp.exe

The following registry keys are also added:

• HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control "Sysuser"
• HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control "Sysuser"
• HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control "Sysuser"

The user's startpage of the browser is changed to the following URL by modifying the registry at the following place:

• HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main "Start Page" = http://www.getgood.biz

Remote Access Functionality

Once running on the victim machine, a random port is opened on the infected system. The port numbers observed during testing were: 27507, 24367, 25519.

Mapped drives on the infected system were removed as well

Symptoms

Symptoms -

• Unusual ports are opened
• Existence of the files/Registry keys detailed 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, email, etc.

Removal -

Removal -

All Users:
Use specified 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