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Chapter 9 Intruders and Viruses Henric Johnson Blekinge Institute of Technology, Sweden http://www.its.bth.se/staff/hjo/ [email_address]
Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Intruders ,[object Object],[object Object],[object Object],[object Object]
Intrusion Techniques ,[object Object],[object Object],[object Object],[object Object]
Intrusion Techniques ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
UNIX Password Scheme Loading a new password
UNIX Password Scheme Verifying a password file
Storing UNIX Passwords ,[object Object],[object Object]
” Salt” ,[object Object],[object Object],[object Object],[object Object]
Password Selecting Strategies ,[object Object],[object Object],[object Object],[object Object]
Markov Model
Transition Matrix ,[object Object],[object Object],[object Object]
Spafford (Bloom Filter) ,[object Object],[object Object],[object Object],[object Object]
Spafford (Bloom Filter) ,[object Object],[object Object]
Performance of Bloom Filter
The Stages of a Network Intrusion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Intusion Detection ,[object Object],[object Object],[object Object]
Profiles of Behavior of Intruders and Authorized Users
Intrusion Detection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Measures used for Intrusion Detection  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Distributed Intrusion Detection Developed at University of California at Davis
Distributed Intrusion Detection
Viruses and ”Malicious Programs” ,[object Object],[object Object]
Taxanomy of Malicious Programs Need Host Program Independent Trapdoors Logic Bombs Trojan Horses Viruses Bacteria Worms Malicious Programs
Definitions ,[object Object],[object Object],[object Object],[object Object]
Definitions ,[object Object],[object Object],[object Object],[object Object]
Virus Phases ,[object Object],[object Object],[object Object],[object Object]
Virus Protection Have a well-known  virus protection program, configured to scan disks and downloads automatically for known viruses. Do not execute programs (or "macro's") from unknown sources (e.g., PS files, Hypercard files, MS Office documents,  Avoid the most common operating systems and email programs, if possible.
Virus Structure
A Compression Virus
Types of Viruses ,[object Object],[object Object],[object Object],[object Object],[object Object]
Macro Viruses ,[object Object],[object Object],[object Object]
Antivirus Approaches ,[object Object],[object Object],[object Object],[object Object]
Advanced Antivirus Techniques ,[object Object],[object Object],[object Object],[object Object],[object Object]
Advanced Antivirus Techniques
Recommended Reading and WEB Sites ,[object Object],[object Object],[object Object]

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Intruders and Viruses in Network Security NS9