intrusion Hear it!

intrusion Definition

in·trusion (in tro̵̅o̅′z̸hən)

noun

    1. the act of intruding
    2. Law the illegal entering upon another's land without right to possession
  2. Geol.
    1. the invasion, as of liquid magma, into or between solid rock
    2. the body of rock resulting from such invasion

Etymology: ME < OFr < ML intrusio < L intrusus: see intrusive

intrusion Synonyms

intrusion

n.

interruption, forced entrance, trespass, intervention, interposition, meddling, obtrusion, encroachment, invasion, incursion, inroad, infraction, overrunning, unwelcome suggestion, overstepping, impingement, imposition, transgression, nose-in*, horn-in*, muscle-in*; see also interference 2.

Intrusion Hacker Definition

To compromise a computer system by breaking the security of such a system or causing it to enter into an insecure state. The act of intruding—or gaining unauthorized access to a system—typically leaves traces that can be discovered by intrusion detection systems. One of the goals of intruders is to remain undetected for as long as possible so that they can continue with their malicious activity ­undisturbed.

Security professionals need to take steps when a system breach is suspected. First, suspicious accounts should be disabled immediately. Then, the suspicious accounts need to be reviewed to assess who set up the account and for what reasons. Because audit logs will indicate who created the account, finding the time and date on which the account was created will be very useful information. If the account is the outcome of a crack attack, the system reviewer will have a particular time frame in which to determine whether other audit log events are “of interest.”

If the reviewer wants to determine whether a suspicious application is indeed being used by a cracker to listen for incoming connections—a potential “back door” into the system—the reviewer is well advised to consider using a tool such as TCPView. The TCPView tool will tell the system reviewer what applications are using open system ports. Because crackers can put Trojan horses in place of the netstat and Isof programs, the reviewer should scan the attacked system from a different computer. This feat can be accomplished by using a service such as the free insecure.org nmap port scanner.

Malware can also be triggered from the operating system’s job scheduler. A system reviewer can see what jobs—legitimate or otherwise—are scheduled to be executed in the system by typing AT at the command prompt.

See Also: Audit Trail; Back or Trap Door; Cracking; Exploit; Log; Malware; Vulnerabilities of Computers.

Haberstetzer, V. Thwarting Hacker Techniques: Signs of a Compromised System. [Online, March 21, 2005.] TechTarget Website. http://searchsecurity.techtarget.com/tip/ 0,289483,sid14_gci1069097,00.html?track=NL-35.

intrusion Usage Examples

Preposition: into

  • grief: Some may welcome sympathetic media interest especially if a suicide occurs in unusual circumstances, but avoid unnecessary intrusion into grief and family privacy.
  • privacy: Be ethical How much information is an intrusion into privacy?

Converse of object

  • resent: He seemed to resent the intrusion of a human being in such an unfrequented spot.
  • detect: The shaman journeys or passes his/her hands over the client's body to detect intrusions.
  • minimize: The design places great emphasis on minimizing intrusion on the landscape.
  • justify: It has even used people's very natural fear of terrorism to justify intrusions that having nothing to do with tackling that threat.

Adjective modifier

  • igneous: There are also a number of igneous intrusions into the Coal Measures.
  • unwarranted: The synagogue later apologized to Rabbi Carr for " unwarranted intrusion into aspects of her private life.
  • unwelcome: During bereavement a break can seem a daunting prospect, even an unwelcome intrusion.
  • granitic: Minerals Mineralization may occur around the small number of granitic intrusions of the area.
  • unauthorized: Such systems could be targeted through unauthorized intrusions, DDoS attacks, worms, Trojan horse programs, or malicious insiders.
  • saltwater: Saltwater intrusion into the aquifer compounded the water shortage problem.

Modifies a noun

  • detection: Network intrusion detection sensors are usually built around low level models of network traffic.
  • prevention: Intrusion prevention measures are required, corresponding to the state of the art for web applications.
  • attempt: It also provides a proper hardware firewall to protect your LAN from any intrusion attempts or attacks.

Noun used with modifier

  • dolerite: Millions of years ago there was a volcanic dolerite intrusion into the overlying rock.
  • cyber: We are also seeing the increased use of cyber intrusions by criminal groups who attack systems for purposes of monetary gain.
  • collateral: In doing so they must address the possibility of collateral intrusion.
  • granite: Granite intrusion by time from 295 to 270 million years.
  • hacker: Similar hacker intrusions are regularly experienced by all other US military services and government agencies.