Proses Serangan terhadap Jaringan Komputer
Feb 24, 2016
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
Registrant: PT Kompas Media Nusantara Jalan Palmerah Selatan 26-28 Jakarta, Jakarta 10270 ID
Domain name: KOMPAS.COM
Administrative Contact: Division, Internet [email protected] Jalan Palmerah Selatan 26-28 Jakarta, Jakarta 10270 ID 1(888)811-8681 Technical Contact: Administration, VIC DNS [email protected] P.O. Box 31571 Knoxville, TN 37930 US 865 470 7851 Fax: 865 470 7369
Registration Service Provider: Virtual Interactive Center, [email protected] 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
KOMPAS.COM
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 replyTarget alive Intruder
Querying multiple hosts – Ping sweep is fairly slowExamples UNIX – fping and gping
WINDOWS - Pinger
Broadcast ICMPIntruder Network
ICMP ECHO request
ICMP ECHO reply
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 ICMPExample 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
ServerClient
C(SYN:PortNo & ISN)
S (SYN & ISN) + ACK[ C (SYN+!) ]
RESET (not active)
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() ScanSYN 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
14
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