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Panda Security Info Glossary
Technical definitions related to viruses and antivirus, essential to know them better and protect against attack.FREE DOWNLOAD
This technology is used, among other things, to improve the functionality of web pages (adding animations, video, 3D browsing, etc). ActiveX controls are small programs that are inserted in these pages. Unfortunately, as they are programs, they can also be targets for viruses.
A file with WAB extension. This is used to store information about other users such as e-mail addresses etc.
A person or program responsible for managing and monitoring an IT system or network, assigning permissions etc.
These rights allow certain people to carry out actions or operations on networked computers.
This is a kind of technology that allows data to be sent at very high speed across an Internet connection. It requires a special ADSL modem.
Programs that display advertising using any means: pop-ups, banners, changes to the browser home page or search page, etc. Adware can be installed with the user consent and awareness, but sometimes it is not. The same happens with the knowledge or lack o knowledge regarding its functionalities.
Although each virus has a specific name, very often it is more widely-known by a nickname that describes a particular feature or characteristic of the virus. In these cases, we talk about the virus 'alias'. For example, the virus CIH is also known by the alias Chernobyl.
Is a voluntary organization that sets standards, particularly for computer programming.
These are techniques used by viruses to avoid being detected.
These are programs that scan the memory, disk drives and other parts of a computer for viruses.
This is a technique used by viruses to hide and avoid detection by the antivirus.
Is a standard code -American Standard Code for Information Interchange- for representing characters (letters, numbers, punctuation marks, etc.) as numbers.
These are particular types of web pages that allow a site to be personalized according to user profiles. This acronym can also refer to Application Service Provider.
The way in which a virus codifies (or encrypts) part or all of itself, making it more difficult to analyze or detect to analyze.
This is a program that enters the computer and creates a backdoor through which it is possible to control the affected system without the user realizing.
A malicious program, which using different techniques, steals confidential information to the customers of online payment banks and/or platforms.
An advert displayed on a web page, promoting a product or service that may or may not be related to the host web page and which in any event links directly to the site of the advertiser.
Files with a BAT extension that allow operations to be automated.
A system or service on the Internet that allows subscribed users to read and respond to messages written by other users (e.g. in a forum or newsgroup).
A plugin that is automatically runs long with the Internet browser, adding to its functionality. Some are used for malicious ends, such as monitoring the web pages viewed by users.
Also known as the Boot sector, this is the area or sector of a disk that contains information about the disk itself and its properties for starting up the computer.
Disk (floppy disk, CD-ROM or hard disk) that makes it possible to start up the computer.
A contraction of the word ‘robot’. This is a program that allows a system to be controlled remotely without either the knowledge or consent of the user.
A network or group of zombie computers controlled by the owner of the bots. The owner of the botnets sends instructions to the zombies. These commands can include updating the bot, downloading a new threat, displaying advertising or launching denial of service attacks.
A browser is the program that lets users view Internet pages. The most common browsers are: Internet Explorer, Netscape Navigator, Opera, etc.
This is an intermediary memory space used to temporarily save information transferred between two units or devices (or between components in the same system).
This is a fault or error in a program.
Communication channel between different components in a computer (communicating data signals, addresses, control signals, etc).
This is a unit of measurement of digital information. One byte is equal to 8 bits.
As there are many different types of viruses, they are grouped in categories according to certain typical characteristics.
Technique used by certain viruses and worms to make them more difficult to find. By using this technique, the size of the infected file doesn’t change (they only occupy cavities in the file affected).
Various consecutive sectors of a disk.
Content of virus files -virus code, written in a certain programming language-. Can also refer to systems for representing or encrypting information. In its strictest sense, it can be defined as a set of rules or a combination of symbols that have a given value within an established system.
This is a type of virus that doesn’t insert itself in programs, but attaches itself to them instead.This is a type of virus that doesn’t insert itself in programs, but attaches itself to them instead.
Files, or groups of files, are compressed into another file so that they take up less space.
This is a text file which is sometimes sent to a user visiting a web page to register the visit to the page and record certain information regarding the visit.
This generally refers to the country where the first incidence of virus was first recorded.
All programs, messages or documents used directly or indirectly to fraudulently obtain financial gain to the detriment of the affected user or third parties.
A collection of data files and the programs used to administer and organize them. Examples of database systems include: Access, Oracle, SQL, Paradox, dBase, etc.
This is a Denial of Service (DoS) attack where multiple computers attack a single server at the same time. Compromised computers would be left vulnerable, allowing the attacker to control them to carry out this action.
A tool for reading the source code of programs.
A folder in e-mail programs that contains messages which have been deleted (they have not been eliminated completely from the computer). After deleting a message containing a virus, it is advisable to delete it from this folder as well.
The latest date when the detection of a malware was updated in the Virus Signature File.
This is a program that is often used to maliciously redirect Internet connections. When used in this way, it disconnects the legitimate telephone connection used to hook up to the Internet and re-connects via a premium rate number. Often, the first indication a user has of this activity is an extremely expensive phone bill.
Divisions or sections used to structure and organize information contained on a disk. The terms folder and directory really refer to the same thing. They can contain files or other sub-directories.
The action that an antivirus takes when it detects a virus and eliminates it.
System to enable communication between computers connected across a network or the Internet. It means that computers can be located and assigns comprehensible names to their IP addresses. DNS servers, are those computers in which these names are handled (resolved) and associated to their corresponding IPs.
This is a type of attack, sometimes caused by viruses, that prevents users from accessing certain services (in the operating system, web servers etc.).
This is the process of obtaining files from the Internet (from Web pages or FTP sites set up specifically for that purpose).
A program, known as a controller, used to control devices connected to a computer (normally peripherals like printers, CD-ROM drives, etc).
A program, known as a controller, used to control devices connected to a computer (normally peripherals like printers, CD-ROM drives, etc).
A special type of file with the extension DLL.
European Institute of Computer Anti-Virus Research. An organisation which has created a test to evaluate the performance of antivirus programs, known as the EICAR test.
A floppy disk that allows the computer to be scanned for viruses without having to use the antivirus installed in the system, but by using what is known as the "command line antivirus".
A technique for infecting programs through which a virus tries to hide its entry point in order to avoid detection. Instead of taking control and carrying out its actions as soon as the program is used or run, the virus allows it to work correctly for a while before the virus goes into action.
Files have a name and an extension, separated by a dot: NAME.EXTENSION. A file can have any NAME, but the EXTENSION (if it exists) has a maximum of three characters. This extension indicates the type of file (text, Word document, image, sound, database, program, etc.).
Some viruses may have similar names and characteristics. These viruses are grouped into families or groups. Members of the group are known as variants of the family or the original virus (the first to appear).
This is a section of a disk that defines the structure and organization of the disk itself. It also contains the ‘addresses’ for all the files stored on that disk.
Unit for storing information (text, document, images, spreadsheet etc.) on a disk or other storage device. A file is identified by a name, followed by a dot and then its extension (indicating the type of file).
This is a barrier that can protect information in a system or network when there is a connection to another network, for example, the Internet.
Is a high-speed communication channel, used to connect computers and peripherals to other computers.
The date when a particular virus was first discovered.
The date when the detection of a certain malware was first included in the Virus Signature File.
Programs that repeatedly send a large message or text to a computer through messaging systems like MSN Messenger in order to saturate, collapse or flood the system.
All software legally distributed free of charge.
A mechanism that allows files to be transferred through a TCP/IP connection.
A computer that allows communication between different types of platforms, networks, computers or programs.
system that allows the Windows operating system to display presentations on-screen or in print.
Program that can be used by a hacker to carry out actions that cause problems for the user of the affected computer (allowing the hacker to control the affected computer, steal confidential information, scan communication ports, etc).
Term referring to all physical elements in an IT system (screen, keyboard, mouse, memory, hard disks, microprocessor, etc).
This is the part of a file in which information about the file itself and its location is kept.
This term, which refers to problem solving by trial and error, is used in the computer world to refer to a technique used for detecting unknown viruses.
Any program that changes the browser settings, to make the home page or the default search page, etc. different from the one set by the user.
This is not a virus, but a trick message warning of a virus that doesn’t actually exist.
This is a communication system that allows web pages to be viewed through a browser.
Obtaining confidential user information, such as passwords for accessing services, in order that unauthorized individuals can impersonate the affected user.
System used to handle inbound/outbound information transfers between a group of devices or files.
This is a Microsoft server (Internet Information Server), designed for publishing and maintaining web pages and portals.
This is a system or protocol which allows access to e-mail messages.
A virus is said to be in circulation, when cases of it are actually being detected somewhere in the world.
This is an official list drawn up every month of the viruses reported causing incidents.
This is a folder in e-mail programs which contains received messages.
This refers to the process of a virus entering a computer or certain areas of a computer or files.
The system through which users can interact with the computer and the software installed on it. At the same time, this software (programs) communicates via an interface system with the computer’s hardware.
A signal through which a momentary pause in the activities of the microprocessor is brought about.
An IP address is a code that identifies each computer. The TCP/IP protocol is the system, used in the Internet, that interconnects computers and prevents address conflicts.
These are written conversations over the Internet in which files can also be transferred.
A type of connection for digitally transmitting information (data, images, sound etc).
These are small programs that can be included in web pages to improve the functionality of the page.
A programming language that offers dynamic characteristics (e.g. variable data depending on how and when someone accesses, user interaction, customized features, etc.) for HTML web pages.
This is not a virus, but a trick that aims to make users believe they have been infected by a virus.
This is the central module of an operating system.
This is not a virus, but a trick that aims to make users believe they have been infected by a virus.
A network of interconnected computers in a reasonably small geographical area (generally in the same city or town or even building).
These are parts of a web page, e-mail or document (text, images, buttons, etc.), that when clicked on, take the user directly to another web page or section of the document.
This is a type of virus that modifies the address where a file is stored, replacing it with the address of the virus (instead of the original file). As a result, when the affected file is used, the virus activates. After the computer has been infected, the original file will be unusable.
A set of commands or instructions carried out by a program repeatedly until a certain condition is met.
A macro is a series of instructions defined so that a program, say Word, Excel, PowerPoint, or Access, carries out certain operations. As they are programs, they can be affected by viruses. Viruses that use macros to infect are known as macro viruses.
A virus that affects macros in Word documents, Excel spreadsheets, PowerPoint presentations, etc.
This term is used to refer to all programs that contain malicious code (MALicious softWARE), contain malicious code, whether it is a virus, Trojan or worm.
This is the action of assigning a shared network disk a letter in a computer, just as if it were another drive in the computer itself.
Messaging Application Program Interface. A system used to enable programs to send and receive e-mail via a certain messaging system.
This is a 32 bit number that identifies an IP address in a certain network. This allows the TCP/IP communication protocol to know if a an IP address of a computer belongs to one network or another.
A fundamental characteristic of a virus. This is the way in which a virus infects a computer.
A fundamental characteristic of a virus. This is the way in which a virus spreads from one computer to another.
This is the integrated electronic heart of a computer or IT system e.g. Pentium (I, II, III, IV,...), 486, 386, etc.
This is the set of specifications that allows text and files with different character sets to be exchanged over the Internet (e.g. between computers in different languages).
A peripheral device, also known as MOdulator DEModulator, used to transmit electronic signals (analogical and digital). It is designed to enable communication between computers or other types of IT resources. It is most often used for connecting computers to the Internet.
In IT parlance, this is a set or group of macros in a Word document or Excel spreadsheet, etc.
This operating system, which predates Windows, involves the writing of commands for all operations that the user wants to carry out.
A server for storing data, which is compatible with SQL Server 2000.
This is an organized mail system that receives messages and distributes them to the recipients. MTAs also transfer messages to other mail servers. Exchange, sendmail, qmail and Postfix, for example, are MTAs.
This is a characteristic of a particular type of sophisticated virus, which infects computers by using a combination of techniques used by other viruses.
Some viruses can use a mutex to control access to resources (examples: programs or even other viruses) and prevent more than one process from simultaneously accessing the same resource. By doing this, they make it difficult for antiviruses to detect them. These viruses can ‘carry’ other malicious code in the same way that other types, such as polymorphic viruses, do.
Group of computers or other IT devices interconnected via a cable, telephone line, electromagnetic waves (satellite, microwaves etc), in order to communicate and share resources. Internet is a vast network of other sub-networks with millions of computers connected.
An Internet service through which various people can connect to discuss or exchange information about specific subjects.
A nuke attack is aimed at causing the network connection to fail. A computer that has been nuked may block.
Person or program that launches a nuke attack, causing a computer to block or the network connection to fail.
A standard for embedding and attaching images, video clips, MIDI, animations, etc in files (documents, databases, spreadsheets, etc). It also allows ActiveX controls to be embedded.
System for subscribing or registering via the Internet as a user of a product or services (in this case, a program and associated services).
A set of programs that enables a computer to be used.
A program -or network connection- used to offer services via the Internet (usually file sharing), which viruses and other types of threats can use to spread. Some examples of this type of program are KaZaA, Emule, eDonkey, etc.
An operation in which a group of files (or just one) are put into another file, thus occupying less space. Packaging is similar to file compression, but is the usual way of referring to this in Unix/Linux environments. The difference between packaging and compression are the tools used. For example, a tool called tar is normally used for packaging , while zip or gzip -WinZip- are used for compressing.
A variable piece of data indicating how a program should behave in any given situation.
A division of a computer’s hard disk which enables the operating system to identify it as if it were a separate disk. Each partition of a hard disk can have a different operating system.
An area of a disk containing information about the sections or partitions, that the disk is divided into.
This is a sequence of characters used to restrict access to a certain file, program or other area, so that only those who know the password can enter.
A program that obtains and saves confidential data, such as user passwords (using keyloggers or other means). This program can publish the list, allowing third-parties to use the data to the detriment of the affected user.
The effects of a virus.
A pocket-sized, portable computer (also called palmtops). Like other computers, they have their own operating system, have programs installed and can exchange information with other computers, the Internet, etc. Well-known brands include Palm, PocketPC, etc.
This is the process that some antivirus programs carry out of continually scanning any files that are used in any operations (albeit by the user or the operating system.) Also known as sentinel or resident.
Phishing involves massive sending of emails that appear to come from reliable sources and that try to get users to reveal confidential banking information. The most typical example of phishing is the sending of emails that appear to come from an online bank in order to get users to enter their details in a spoof web page.
Refers to an operating system, in a specific environment and under certain conditions (types of programs installed, etc.).
A program that adds new functionality to an existing system.
A technique used by viruses to encrypt their signature in a different way every time and even the instructions for carrying out the encryption.
List of options that is displayed when clicking on a certain item or area of a window in a program with the secondary mouse button (usually the right). These options are shortcuts to certain functions of a program.
A window that suddenly appears, normally when a user selects an option with the mouse or clicks on a special function key.
Point through which a computer transfers information (inbound / outbound) via TCP/IP.
Program that is installed without express permission from the user and carries out actions or has characteristics that can reduce user control of privacy, confidentiality, use of computer resources, etc.
This is a technique used by viruses for infecting files by adding their code to the beginning of the file. By doing this, these viruses ensure that they are activated when an infected file is used.
A feature in e-mail programs that allows the content of the message to be viewed without having to open the e-mail.
This is the document that sets out the procedures, rules, and data security practices of a company to guarantee the integrity, confidentiality and availability of data collected from clients and other interested parties in accordance with applicable legislation, IT security needs and business objectives.
Ability to protect the computer against unknown malware by analyzing its behavior only, and therefore not needing a virus signature file periodically updated.
A program that ends actions or processes that are running (active) on a computer, which could pose a threat.
Elements that allow operations to be performed. A program is normally a file with an EXE or COM extension.
Set of instructions, orders, commands and rules that are used to create programs. Computers understand electronic signals (values 0 or 1). Languages allow the programmer to specify what a program must do without having to write long strings of zeros and ones, but using words (instructions) that are more easily understood by people.
A system of rules and specifications that enables and governs the communication between to computers or IT devices (data transfer).
The area next to the Windows Start button or menu, which contains shortcut icons to certain items and programs: e-mail, Internet, antivirus, etc.
This is a computer's main memory, in which files or programs are stored when they are in use.
This is a section or folder on the hard disk where deleted files are stored (provided they haven’t been permanently deleted).
The action of gaining access to a user’s computers (with or without the user’s consent) from a computer in a different location. This access could pose a threat if it is not done correctly or for legitimate purposes.
Among other things, the action by which a virus propagates or makes copies of itself, with the aim of furthering the spread of the virus.
A program or file is referred to as resident when it is stored in the computer’s memory, continuously monitoring operations carried out on the system.
A system governing privilege levels in a microprocessor, controlling the operations that can be performed and its protection. There are various levels: Ring0 (administrator), Ring1 and Ring2 (administrator with less privileges), Ring3 (user).
This is a type of memory which under normal circumstances cannot be written on, and therefore its content is permanent.
A program designed to hide objects such as processes, files or Windows registry entries (often including its own). This type of software is not malicious in itself, but is used by hackers to cover their tracks in previously compromised systems. There are types of malware that use rootkits to hide their presence on the system.
Invariable sequence of instructions, that make up part of a program and can be used repeatedly.
Any illegal plot or fraud in which a person or group of persons are tricked into giving money, under false promises of economic gain (trips, vacations, lottery prizes, etc.).
The action of identifying the communications ports and/or IP addresses of a computer and getting information about their status. This action can sometimes be considered an attack or threat.
These files, which have the extension SCR, could be Windows screensavers or files written in Script language.
This is a program that displays pictures or animations on the screen. These programs were originally created to prevent images from burning onto the screen when the computer wasn’t used for a while.
Set of additional files applied to a software program or application to resolve certain problems, vulnerabilities or flaws.
This covers anything that can have negative consequences for the user of the computer. For example, a program for creating viruses or Trojans.
IT system (computer) that offers certain services and resources (communication, applications, files, etc.) to other computers (known as clients), which are connected to it across a network.
Evaluation versions of a software product that allow users to try out a product for a period of time before buying it. Shareware versions are normally free or significantly cheaper than complete versions.
This is like the virus passport number. A sequence of characters (numbers, letters, etc.) that identify the virus.
This is a protocol used on the Internet exclusively for sending e-mail messages.
Files, programs, applications and operating systems that enable users to operate computers or other IT systems. These are the elements that make the hardware work.
Unsolicited e-mail, normally containing advertising. These messages, usually mass-mailings, can be highly annoying and waste both time and resources.
A program that allows the mass-mailing of unsolicited, commercial e-mail messages. It can also be used to mass-mail threats like worms and Trojans.
This attack uses phishing techniques but is aimed at a specific target. The creator of this type of attack will never use spam to obtain a massive avalanche of personal user data. The fact that it is targeted and not massive implies careful preparation in order to make it more credible and the use of more sophisticated social engineering techniques..
Programs that collect information about users' browsing activity, preferences and interests. The data collected is sent to the creator of the application or third-parties, and can be stored in a way that it can be recovered at another time. Spyware can be installed with the user consent and awareness, but sometimes it is not. The same happens with the knowledge or lack of knowledge regarding data collected and the way it is used.
A standard programming language aimed at enabling the administration and communication of databases. It is widely used in the Internet (e.g. Microsoft SQL Server, MySQL, etc).
A sample of malware has statistics whenever its infection percentage is among the 50 most active threats.
A section that appears at the bottom of the screen in some Windows programs with information about the status of the program or the files that are in use at the time.
A technique used by viruses to infect computers unnoticed by users or antivirus applications.
Each of the sub-groups into which a type is divided. In this case, a group of viruses or threats within the same category or type, with certain characteristics in common.
These are the actions or effects that a virus could have when it infects a computer including trigger conditions.
Attacks aimed specifically at a person, company or group and which are normally perpetrated silently and imperceptibly. These are not massive attacks as their aim is not to reach as many computers as possible. The danger lies precisely in the customized nature of the attack, which is designed especially to trick potential victims.
A list of all programs and processes currently active (normally in the Windows operating system).
The real name of a virus, which also defines its class or family.
This is a file that defines a set of initial characteristics that a document should have before starting to work with it.
All programs that monitor the actions of users on the Internet (pages visited, banners clicked on, etc.) and create a profile that can be used by advertisers.
Strictly speaking, a Trojan is not a virus, although it is often thought of as such. Really they are programs that, enter computers appearing to be harmless programs, install themselves and carry out actions that affect user confidentiality.
A characteristic that allows certain programs to stay in memory after having run.
A technique used by some viruses to foil antivirus protection.
Antiviruses are constantly becoming more powerful and adapting to the new technologies used by viruses and virus writers. If they are not to become obsolete, they must be able to detect the new viruses that are constantly appearing. To do this, they have what is called a Virus Signature File
This is a file compression tool (Ultimate Packer for eXecutables) which also allows programs compressed with this tool to be run without having to be decompressed.
An antivirus technique that allows file information to be stored, and posible infections detected when a change is noted in the file.
A variant is a modified version of an original virus, which may vary from the original in terms of means of infection and the effects that it has.
Viruses are programs that can enter computers or IT systems in a number of ways, causing effects that range from simply annoying to highly-destructive and irreparable.
A malicious program intended to create new viruses without having any programming skills, as it has an interface that allows to choose the characteristics of the created malware: type, payload, target files, encryption, polymorphism, etc.
This file enables the antivirus to detect viruses.
This is a partition of a hard disk, or a reference to a complete hard disk. This term is used in many networks where there are shared disks.
A network of interconnected computers over a large geographical area, connected via telephone, radio or satellite.
This is the main area of Windows that appears when you start up the computer. From here you can access all tools, utilities and programs installed on the computer, via shortcut icons, options in the Windows Start menu, the Windows taskbar, etc.
program or application available in Windows to administer the files available on the computer. It is very useful for getting an organized view of all directories.
This is a file that stores all configuration and installation information of programs installed, including information about the Windows operating system.
These are sections of the Windows Registry that store information regarding the system’s settings and configuration.
Area in the Windows taskbar (usually in the bottom right corner of the screen), which contains the system clock, icons for changing system settings, viewing the status of the antivirus protection, etc.
This is a bar that appears at the bottom of the screen in Windows. The bar contains the Start button, the clock, icons of all programs resident in memory at that moment and shortcuts that give direct access to certain programs.
A service for determining names associated with computers in a network and allowing access to them. A computer contains a database with IP addresses (e.g. 188.8.131.52) and the common names assigned to each computer in the network (e.g. SERVER1).
One of the computers connected to a local network that uses the services and resources in the network. A workstation does not normally provide services to other machines in the network in the same way a server does.
This is similar to a virus, but it differs in that all it does is make copies of itself (or part of itself).
These rights or permissions allow a user or a program to write to a disk or other type of information storage unit.
This is a technique used to allow files on a disk or other storage device to be read but to prevent users from writing on them.
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