Hacker’s Strategies Revealed WEST CHESTER UNIVERSITY Computer Science Department Yuchen Zhou March 22, 2002.

Hacker’s Strategies Revealed

WEST CHESTER UNIVERSITY

Computer Science Department

Yuchen Zhou

March 22, 2002

Requirements:• Hardware: -Two computers

-One hub

-Internet access

• Software: -Windows 98/2000

-Trojan horse (Glacier 6.0)

-Sniffer ( password monitor)

-Port scanner (Fluxay IV)

Case 1: Trojan Horse:

• Suppose a Trojan horse (server.exe) was installed on computer A already.

• One can execute a control program(client.exe) on computer B to control computer A.

Planting a Trojan Horse

• Direct execution of a Trojan horse• Sent as an e-mail attachment• Link an icon (as a “bait”) to a Trojan Horse• Guess password of a user and then use remote execution

Hacking Remotely

• Run a client program to control the compromised system remotely

Searching...

port

delay time

domain

begin from

to

Victim found

All folders and filesin computer A. We cancopy, rename, run or delete them remotely.

All folders and filesin computer A. We cancopy, rename, run or delete them remotely.

Computer A’s basic information

System informationof computer A.

System informationof computer A.

Passwordrelated commands

Controlrelatedcommands

Networkrelatedcommands

All the passwords in computer A's cache.

Password in cache

Monitoring computer A’s screen

Controlling Computer A’s screen

Other operations you can use to control computer A

• Find/copy/delete files from computer A

• Share a directory

• Kill a process

• Change the registry

• Record the keyboard

• Shut/restart the computer

All commandswe can use

Case 2: Sniff a Password

• If computer A transmits some data frames to a server machine D via an Ethernet, every computer will receive a copy.

• Only computer D should accept it; others should discard the data frames.

• However, a sniffer running on machine B or C receives it and analyzes it even B or C is not the destination.

The URL computer A visiting

username

password

Computer A’s IP address

log on time

monitoring NIC

When the password was detected, it will display here.

When the password was detected, it will display here.

This file’s name is “webfilter.txt”, “pwmonitor” need this file to identify the URLs. That is to say, only when the URL computer A visiting is in this filter file can the passwords be sniffed. Because this sniffer is created in China, most of the URLs located in China, but we can find yahoo.com here.

This file’s name is “webfilter.txt”, “pwmonitor” need this file to identify the URLs. That is to say, only when the URL computer A visiting is in this filter file can the passwords be sniffed. Because this sniffer is created in China, most of the URLs located in China, but we can find yahoo.com here.

Case 3: Hack a Server

• Computer A is a server, B is a client

• Scans the ports of computer A

• Guesses the password of admin.

• After the computer is compromised, a hacker can plant some backdoor software to the server and execute it remotely.

Hosts’ typeHosts’ type

username password hosts

Flaxuy is the most popular ports scanner used in China these days.It scans all services (ports) of the servers provide, once it finds a certain service (FTP, telnet...), it will try to find the users and guess the passwords...

Flaxuy is the most popular ports scanner used in China these days.It scans all services (ports) of the servers provide, once it finds a certain service (FTP, telnet...), it will try to find the users and guess the passwords...

Scan from

to

Host type

Guess password

Display password if get

Scanning...

Now we get thepassword.

Computer 144.26.30.40’s Administrator is “TopTooler”,the password is “toptooler”, we can establish a IPC connection.

Computer 144.26.30.40’s Administrator is “TopTooler”,the password is “toptooler”, we can establish a IPC connection.

password

Using this command, we can log on to the server as an administrator.

Using this command, we can log on to the server as an administrator.

Then copy a Trojan horse to a server

Then copy a Trojan horse to a server

The Trojan horse will be started automatically

at 13:50p.m. on the server.

The Trojan horse will be started automatically

at 13:50p.m. on the server.