Computer crimes or cybercrimes have been on the rise since the introduction of the Internet. More so with the onset of mobility and the launch of wireless networking, the increase in mischievous computer activities was exponentially high. Since cybercrimes are considered "faceless crimes" where a criminal hacker can do their misdeeds miles or continents away, or set-up a logic bomb a few hours later, it has been more difficult to trace these malicious acts.

             In determining specific categories or types of IT-related attacks, it is noteworthy to examine the lists prepared by Mandia et al. (2001) in the book "Incident Response: investigating Computer Crime:.

             1.Denial-of-service attacks are some of the easiest incidents to respond to, because they do not involve actual intrusions.

             2.Unauthorized uses of resources are typically insiders using their computers in an inappropriate manner. These investigations are often more oriented around personnel rather than technical issues.

             3.Theft of information attacks involves unauthorized read-only access to information. While these are typically solved easily through configuration, it is very difficult to tell through an initial investigation if the attacker's access is read-only or actually involved a full-blown computer intrusion.

             4.Vandalism is really a subset of computer intrusion, because it is not possible without access to the victim system.

             5.Computer intrusions are the "mother of all incidents," in that they require the most involved response.

             The best way to determine unauthorized computer access, downloading, copying and transferring of classified or confidential materials is by examining and evaluating the log files and access control lists. Unless the intruder or attacker is a sophisticated or high-caliber criminal hacker, this is the quickest and simplest method available, otherwise hiring trained professionals who will do computer forensics investigation is necessary to establish criminal liability and culpability.