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Thursday, November 24, 2011


1. The term VIRUS is still used in talks amongst the victims of so many threats which are relatively unknown to the normal user.Here I am putting down the commonly known present day threat terminology.I am missing out on the regular ones that include Malware,adware,spyware,spam etc....


2. A remote administration utility which bypasses normal security mechanisms to secretly control a program, computer or network. These utilities may be legitimate, and may be used for legitimate reasons by authorized administrators, but they may also be misused by attackers. A backdoor is usually able to gain control of a system because it exploits vulnerabilities, bugs or undocumented processes in the system's code. 

A Variation: The IRC Backdoor 

3. There also exist IRC backdoors, which are controlled via bots hidden in specific invite-only IRC channels accessible only to the attacker; these bots serve as the client component of the traditional client-server backdoor arrangement. 


4.  A platform-specific type of worm that propagates primarily over a Bluetooth network. This type of worm is almost always designed to function on mobile devices, which make more use of Bluetooth connectivity than computers. 


5. A malicious program that, on being installed onto a computer system, allows the attacker to enslave the system into a network of similarly affected systems known as a botnet. The individual computers in a botnet may also be referred to as a bot or a zombie. 


6.  A portmanteau formed from the words robot and network, a 'botnet' is a network of infected computers that can be remotely controlled by an attacker, usually via a command-and-control (C&C) server. Each infected computer may be known as a bot , a zombie computer , or a zombie . 


7.   A type of web browser plug-in specifically designed for use with the Microsoft Internet Explorer browser. A Browser Helper Object (BHO) executes automatically every time the browser is launched and provides functionality that is not built-in to the browser. 


8.   A type of attack in which malicious scripts are injected into a legitimate website in oder to be served to subsequent site visitors. Cross site scripting (XSS) attacks can result in a variety of effects, including hijacked web browsing sessions, stolen session cookies, information theft and more. As more people become increasingly dependent on web-based services, XSS attacks are becoming increasingly common. 


9.   A type of Internet-based attack that aims to deny legitimate users access to a service (for example, a website or a network) by overloading a relevant computer resource or network device. The most common type of Denial of Service (DoS) attack takes the form of a massive amount of requests being sent from a host machine to the target, for example, a government website server. 

ICMP Flood

10.   The attackers sends out a flood of ICMP_ECHO packets to the target, swamping CPU usage and effectively rendering the target unusable until the flood is ended or the target is reset or restarted. 

Peer to Peer attack

11.   Attacker exploit bugs in peer-to-peer servers and redirect clients from the peer-to-peer server to the target server instead, flooding the target with thousands of connections and overwhelming its resources. 
Application level floods: A DoS attack carried out via particular applications, most commonly Internet chat systems. The most common kind of flood is an IRC flood, which is carried out on the popular IRC chat system. 


12.   A type of attack conducted over the Internet, using the combined resources of many computers to bombard, and frequently crash, a targeted computer system or resource (e.g., a program, website or network). 


13.   A new type of sophisticated detection that is being increasingly used by antivirus programs to identify programs with malicious characteristics. Unlike more traditional detections (also known as signature-based or single-file detections) a Generic Detection does not identify a unique or individual malicious program. Instead, a Generic Detection looks for broadly applicable code or behavior characteristics that indicate a file as potentially malicious, so that a single Generic Detection can efficiently identify dozens, or even hundreds of malware. 


14.   A virus that mutates, or modifies, its own code at various intervals. The changes in code typically occur each time the virus replicates, or infects a new machine. Detection and disinfection of a polymorphic virus can be very challenging, as mutating code makes traditional signature-based detection methods ineffective. Nowadays, many antivirus programs instead use heuristic analysis to identify polymorphic viruses.


15.   The act of a virus 'mutating' parts of its code at various intervals in order to evade detections. By constantly changing its code, a virus ensures that each iteration of its code looks different from the preceding one, making it impossible for traditional signature-based antivirus programs to identify the two iterations as one and the same virus. These so-called 'mutating viruses' can be divided into polymorphic and metamorphic viruses. 

Polymorphic Versus Metamorphic 

16.   A metamorphic virus works performs its mutation routine differently. Rather than using encryption to obfuscate its virus body, a metamorphic virus 'rearranges' entire chunks of actual code between iterations in order to create a seemingly different virus. The changes in code are directed by a metamorphic engine and despite the alterations, do not affect function - that is, the virus is still able to perform the same malicious actions through each iteration. Fortunately, the major code changes performed by a metamorphic virus require a high degree of technical skill from the virus author, and there are very few such viruses in the wild so far.


17.   A type of attack that exploits a recently publicized vulnerability or security loophole, before program vendors or the security community are able to develop a patch for the vulnerability. The period between the public announcement of a vulnerability and the first release of a patch fixing the vulnerability is also sometimes referred to as "zero hour" – even if the actual timespan is longer than an hour. Dealing With Zero-Day attacks A zero-day attack can be very destructive, as vulnerable systems generally have few defenses against it. 


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