Presentation on theme: "COMPUTER CRIMES - THE LAW ENFORCMENT PERSPECTIVE By: Wilfred A Nathan Computer Forensic Branch Criminal Investigation Department Singapore Police Force."— Presentation transcript:
COMPUTER CRIMES - THE LAW ENFORCMENT PERSPECTIVE By: Wilfred A Nathan Computer Forensic Branch Criminal Investigation Department Singapore Police Force BLACK HAT BRIEFINGS SINGAPORE APR 2000
SCOPE Computer Crime Trends Definition of Computer Crime Case Studies Computer Misuse Act
INTRODUCTION Definition of Computer Crime When there is unauthorised access into a computer system in order to : Destroy data or programs Commit other offences
CASE STUDY ONE The Perfect Computer Crime System Analyst used Trojan horse program to capture colleagues password and used it to modify the Lucky Draw Program. Also gained root access whilst auditing computer system and replaced Lucky Program with fake program that allowed 3 friends to ‘win’ $485,000
CASE STUDY TWO Crashing of Factory Computer SystemDisgruntled system administrator inserted logic bomb that replaced system files with damaged files during backup process. Also used another logic bomb to time backing up process while he was on holiday. Caused entire company’s system to crash and halted production lines. After his dismissal, he asked a computer illiterate colleague to crash system files.
CASE STUDY THREE Smart Card Scam - Managers of Cinema Chain modified Daily Cashiers’ Reports on computer system and siphoned off cash. Also topped up used Smart cards illegally and sold them to cinema touts. Enlisted help of a computer service engineer to load program into a branch so as to further the crime.
CASE STUDY FOUR Distribution of user-ids and passwords - Two youths stole user-ids and passwords of unsuspecting users of an ISP during IRC sessions and displayed the user-ids and passwords on a web site stating that the ISP’s system security had been breached.
Hacking of Television's Stations web-site Two teenagers obtained illegal access to a Television Station web-site by accident and modify several of the web pages with “hacker slogans”. CASE STUDY FOUR
LESSONS LEARNT Lack of òPhysical Security òElectronic Security òGood Security Practices òRegular System Audit òComputer Incident Management
COMPUTER MISUSE ACT Section 3 - Unauthorised Access to Computer Material Section 4 - Access with Intent to Commit or Facilitate Commission of Further Offence Section 5 - Unauthorised Modification of Contents of Computer
Section 6 - Unauthorised Use/Interception of Computer Service Section 7 - Unauthorised obstruction of Use of Computer Section 8 - Unauthorised Disclosure of Access Code Section 9 - Enhanced punishments -Territorial Scope COMPUTER MISUSE ACT
CCB & CFB Computer Crime Investigation Computer Related Crime Investigation Telecommunication Frauds Investigation Training Computer Searches Computer Seizures Computer Forensic Examination Training
COMPUTER CRIME INVESTIGATIONS Preliminary Investigation Evidence Analysis Forensic laboratory and staff for examination of storage media Technical Support from Industry experts Vendors’ information
COMPUTER CRIME INVESTIGATIONS Implications of Police Investigation’ Evidence in police custody till conclusion of the case Commitment of time and resources Adverse publicity
PREVENTION & INCIDENT MANAGEMENT Setting up a Security Team Implement Preventive Measures Incident Management
PREVENTION & INCIDENT MANAGEMENT Preventive Measures Installation and maintenance of Intrusion Detection applications, e.g., Firewall, Intrusion Detection System Proper documentation of computer systems Conduct regular system audit Password management
PREVENTION & INCIDENT MANAGEMENT Preventive Measures Establish links with SingCERT, etc Simulation Excercises Tracking software/hardware for bugs & vulnerabilities
PREVENTION & INCIDENT MANAGEMENT Incident Management - Respond swiftly Collation of essential information and facts Gathering of evidence caller id records, system access logs
PREVENTION & INCIDENT MANAGEMENT Incident Management Ensure system and storage media not tampered document any tampering Report fast to Computer Crime Branch
CONCLUSION Report the incident as early as possible Record all irregularities Do not allow anyone to meddle with the computer Do not restore the affected system