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Types of Computer Viruses
In computing terminology, a malicious code is a term used for computer viruses and programs designed to cause damage to computers. Other types of destructive PC worms are known as Internet virus including the examples like Worms and Trojans.
Outlined below is the description of different kinds of computer viruses:
Program/File Infector
Falling under the category of parasitic viruses, a program or file infector attempts to infect the files with extension code like .exe, .com, .drv, .dil, .bin, .ovl, and .sys. It gets activate along with the execution of executable file containing virus. The virus then loads itself into memory and replicates itself to other executable files when these files are opened or run.
The File Infector virus can destroy the content contained in files and cause irreversible damage to them. Some file viruses have also operated as email worm and Trojan horse.
The best way to disinfect files infected by the file virus is to delete them and restore from back up.
Macro Computer Virus
A macro computer virus is a virus written in a language built into a software application such as a word processor. For example: Microsoft Office has the macro language built into its application. This is why most of its application programs are affected by macro computer virus.
Macro viruses are generally created using the macro recorder or Visual Basic for Applications. The applications that are the most prone to this antivirus are Word Documents, Excel Spreadsheets, Power Point Presentation, and Access Database. The virus infects templates of these documents and therefore every file that the user opens gets affected. Some common macro computer viruses are Auto Exec, Auto New, Auto Open, Auto Close, and Auto Exit.
The auto macros can be disabled by using the command DisableAutoMacros in any macro that is written. Another way to remove it is by holding down the shift key while opening a document.
Multi-Partite Virus
It behaves in the same way as other computer viruses do. As the name signifies, they are sometimes more than one type. These are hybrids and are known as multi-partite virus.
Polymorphic Viruses
It is a kind of virus which produces different but operational copies for itself. Its attack is considered to be extremely dangerous as virus detectors will not be able to detect all instances of virus attacks simultaneously. And this is one of the reasons why it is known to be strategically designed.
Stealth Viruses
A stealth virus uses different mechanisms to prevent recognition by antivirus software. It tries to escape detection either by redirecting the disk head to head to read another sector or modifying the file size shown in the Directory listing.
Classification of some viruses is not possible as they are the file type viruses which start behaving as computer worms with an activation code.
Uncomplicated AD object management on remote server domain
Windows Server 2003 comes with different tools, also known as MMC consoles for managing the Active Directory. The most common of these tools is the Active Directory Users and Computers (ADUC) snap-in which is used for daily management of users and computer objects. With this MMC console, administrators can create, manage and delete user and computer accounts configured with the directory structure. In order to access this console, you have to navigate through Start menu to All Programs/ Administrative Tools and ensure that you are logged into a domain controller since only a DC contains this option.
Under Administrative Tools menu there are other snap-in consoles as well, such as the Active Directory Schema. Schema as we all know contains the attribute definitions of Active Directory objects, but in order to accommodate new definitions in the pool of the already existing ones, schema modification is required. Active Directory Schema MMC console is used for this purpose, although such modifications take place at the forest functional level.
On the other hand, the Active Directory Users and Computers console is strictly a domain level snap-in and does not allow you to work on the Active Directory at the forest level. With this tool, you can only work on the Active Directory objects specific to a domain. Furthermore, the domain which gets listed on the console is the one corresponding to the domain controller on which you will be logged on to. In case you wish to manage a different domain, say a remote domain for a different geographical location, you can take help of the Connect to Domain command. This command lets you search the required domain or enter the domain IP address to access it.
However, this was the case for a remote domain. What if the domain controller itself is situated at a different location? Well, Active Directory users and computers let you to manage domains even if you are not logged in domain controller. ADUC can be easily accessed from a member server by manually loading it on an MMC. This can be carried out by entering the MMC command at the Run prompt of the server to load the console with the tool.
However, for this option, you must have a server at disposal. Otherwise it becomes necessary to establish a Remote Desktop Protocol (RDP) session with one of the servers. This protocol allows you to control server remotely, even a domain controller server. This way you can use the ADUC console even from a remote domain controller.
These hassles can however be avoided with the use of Lepide Active Directory Management and Reporting (LADMR) software. This AD management tool eliminates the need of MMC consoles like ADUC or ADS as it provides a single interface for all kinds of tasks like creating, managing and deleting user or computer accounts and viewing or modifying the AD schema. Whether you have to manage objects on a remote domain or local, this software will provide a single console tree where all the domains and their constituent objects can be viewed and managed easily without worrying about RDP sessions or DC server login.
Uncomplicated AD object management on remote server domain
Windows Server 2003 comes with different tools, also known as MMC consoles for managing the Active Directory. The most common of these tools is the Active Directory Users and Computers (ADUC) snap-in which is used for daily management of users and computer objects. With this MMC console, administrators can create, manage and delete user and computer accounts configured with the directory structure. In order to access this console, you have to navigate through Start menu to All Programs/ Administrative Tools and ensure that you are logged into a domain controller since only a DC contains this option.
Under Administrative Tools menu there are other snap-in consoles as well, such as the Active Directory Schema. Schema as we all know contains the attribute definitions of Active Directory objects, but in order to accommodate new definitions in the pool of the already existing ones, schema modification is required. Active Directory Schema MMC console is used for this purpose, although such modifications take place at the forest functional level.
On the other hand, the Active Directory Users and Computers console is strictly a domain level snap-in and does not allow you to work on the Active Directory at the forest level. With this tool, you can only work on the Active Directory objects specific to a domain. Furthermore, the domain which gets listed on the console is the one corresponding to the domain controller on which you will be logged on to. In case you wish to manage a different domain, say a remote domain for a different geographical location, you can take help of the Connect to Domain command. This command lets you search the required domain or enter the domain IP address to access it.
However, this was the case for a remote domain. What if the domain controller itself is situated at a different location? Well, Active Directory users and computers let you to manage domains even if you are not logged in domain controller. ADUC can be easily accessed from a member server by manually loading it on an MMC. This can be carried out by entering the MMC command at the Run prompt of the server to load the console with the tool.
However, for this option, you must have a server at disposal. Otherwise it becomes necessary to establish a Remote Desktop Protocol (RDP) session with one of the servers. This protocol allows you to control server remotely, even a domain controller server. This way you can use the ADUC console even from a remote domain controller.
These hassles can however be avoided with the use of Lepide Active Directory Management and Reporting (LADMR) software. This AD management tool eliminates the need of MMC consoles like ADUC or ADS as it provides a single interface for all kinds of tasks like creating, managing and deleting user or computer accounts and viewing or modifying the AD schema. Whether you have to manage objects on a remote domain or local, this software will provide a single console tree where all the domains and their constituent objects can be viewed and managed easily without worrying about RDP sessions or DC server login.