Proses Serangan terhadap Jaringan Komputer

Reconnaissance dan footprinting Scanning Enumerasi Mendapatkan Akses Eskalasi Membuat Backdoor dan menyembunyikan jejak

Reconnaissance Fase persiapan awal Mencari informasi sebanyak-banyaknya mengenai target/korban sebelum melakukan serangan Informasi bisa didapat dari target/korban maupun tempat lain yg terkait dengan terkait/korban

footprinting Cetak biru dari profile korban/target Fase ini memakan waktu 90% dari attacker dalam melakukan aksinya (10% untuk menyerang target) Foot-printing perlu dibuat secara sistematik untuk memastikan semua informasi yg terkumpul dan akan digunakan terkait dengan target

KOMPAS.COM Registrant: PT Kompas Media Nusantara Jalan Palmerah Selatan 26-28 Jakarta, Jakarta 10270 ID Domain name: KOMPAS.COM Administrative Contact: Division, Internet admin@vic.com 1(888)811-8681 Technical Contact: Administration, VIC DNS hostmaster@vic.com P.O. Box 31571 Knoxville, TN 37930 US 865 470 7851 Fax: 865 470 7369 Registration Service Provider: Virtual Interactive Center, admin@vic.com 865 524 8888 865 524 0740 (fax) Please contact us for domain login/passwords, DNS/Nameserver changes, and general domain support questions. Registrar of Record: TUCOWS, INC. Record last updated on 09-Dec-2004. Record expires on 17-Dec-2006. Record created on 18-Dec-1995. Domain servers in listed order: NS.VIC.COM 64.203.64.10 NS2.VIC.COM 64.203.64.11 Domain status: ACTIVE

Scanning Scanning can be compared to a thief checking all the doors and windows of a house he wants to break into. Scanning- The art of detecting which systems are alive and reachable via the internet and what services they offer, using techniques such as ping sweeps, port scans and operating system identification, is called scanning. The kind of information collected here has to do with the following: 1) TCP/UDP services running on each system identified. 2) System architecture (Sparc, Alpha, x86) 3) Specific IP address of systems reachable via the internet. 4) Operating System type.

PING SWEEPS ICMP SWEEPS ICMP ECHO request ICMP ECHO reply Intruder Target alive Querying multiple hosts – Ping sweep is fairly slow Examples UNIX – fping and gping WINDOWS - Pinger

Broadcast ICMP Intruder Network ICMP ECHO reply ICMP ECHO request ICMP ECHO reply ICMP ECHO reply Can Distinguish between UNIX and WINDOWS machine UNIX machine answers to requests directed to the network address. WINDOWS machine will ignore it.

PING SWEEPS NON – ECHO ICMP Example ICMP Type 13 – (Time Stamp) Originate Time Stamp - The time the sender last touched the message before sending Receive Time Stamp - The echoer first touched it on receipt. Transmit Time Stamp - The echoer last touched on sending it.

PING Sweeps TCP Sweeps Client Server When will a RESET be sent? C(SYN:PortNo & ISN) S (SYN & ISN) + ACK[ C (SYN+!) ] RESET (not active) Client Server S(ISN+1) When will a RESET be sent? When RFC does not appear correct while appearing. RFC = (Destination (IP + port number) & Source( IP & port number))

Port Scanning Types TCP Connect() Scan SYN packet SYN/ACK listening RST/ACK (port not listening) SYN/ACK A connection is terminated after the full length connection establishment process has been completed

Enumeration Enumeration extracts information about: Resources or shares on the network User names or groups assigned on the network Last time user logged on User’s password Before enumeration, you use Port scanning and footprinting To Determine OS being used Intrusive process