Protecting your business from d do s attacks

Protecting Your Business from DDoS Attacks How effect to DOS attach to the company – what are the DOS attacks, how it effect to the company, how to overcome this problem etc. Saptha Wanniarachchi MBCS,MCSE<MCITP

Introduction
Overview of DDoS Attack ?
How it works
Impact of business
Mitigation
Prevention
Challengers
Q&A

DDoS Attack Overview
Type of attack causes your computer/Network to crash or to become so busy processing data that you are unable to use it
Main objective of committing such attacks does not provide the attacker with any escalated system access; it makes a computer resource unavailable to its intended users.

What Is a DDoS Attack?
uses a network of zombie computers
tells all the computers on his botnet to contact a specific server or Web site repeatedly.
The sudden increase in traffic can cause the site to load very slowly for legitimate users.

Types of DDoS Attacks
Direct Attacks - In a DDoS attack there is at least an attacker, a victim, and an amplifying network .
Remote Attacks – Organized Attack using botnet
Reflected attack – Traffic directed from known host using reflection machenisum
Ping of Death - bots create huge electronic packets and sends them on to victims
Mailbomb - bots send a massive amount of e-mail, crashing e-mail servers
Smurf Attack - bots send Internet Control Message Protocol (ICMP) messages to reflectors
Teardrop - bots send pieces of an illegitimate packet; the victim system tries to recombine the pieces into a packet and crashes as a result

What Is a DDoS Attack?

How it works A botnet is a network of computers that have been infected and can be used remotely by hackers in order to carry out various attacks. Botnets: nearly 1/4 of all computers have them. They use your computer to send spam, collect personal information, or take down websites, all without your knowledge

Site Before the attack begin

Attacked

Server Statistics

Tools efficiency
HTTP Flood Test Report
Date: 10/13/2011 12:51:31 PM
Target URL: www.srilankatravelhub.com
Target Port: 80
Duration: 4 minutes, 14 seconds
Requests Issued: 81907
Responses Received: 58
Requests Lost: 99.93%
Request Rate: 322.47 requests per second

Trend of attacks
DDoS Attacks Continue to Grow
Attackers today are a lot more sophisticated
Every organization online is a potential DDoS Target

Who will conduct DDoS Attacks? & Why?
Personal reasons - target specific computers for revenge
Prestige - gain respect of hacker community
Material gain - damage resources
Political reasons - compromise enemy’s resources

Legal
DDoS is a federal Crime and its illegal in the united states under national information infrastructure protection act 1996
It’s illegal in many countries now
Legal battle to protect DDoS
There’s no such thing as a DDoS attack. A DDoS is a protest, it’s a digital sit-it. It is no different than physically occupying a space. It’s not a crime, it’s speech.
Nothing was malicious, there was no malware, no Trojans. This was merely a digital sit-in. It is no different from occupying the Woolworth’s lunch counter in the civil rights era.

DDOS Tools

Mobile DDoS

Business Impact Business impact System Impact Cost Of Prevention Customer Satisfaction/ Business Connectivity

Victim
Application - exploit some feature of a specific application on victim host - disables legitimate client use of that application and possibly strains resources - indistinguishable from legitimate packets - semantics of application must be heavily used in detection
Host - disable access to the target machine completely by overloading or disabling its communication mechanism (ex: TCP SYN attack) - attack packets carry real destination address of target host
Network Attacks - consume incoming bandwidth of a target networks - attack packets have destination addresses within address space of network - high volume makes detection easy
Infrastructure - target some distributed service that is crucial for the global Internet operation or operation of a sub-network - ex: DNS server attacks

Protecting Your Business from DDoS Attacks
Business disruptions
Estimates from Forrester, IDC, and the Yankee Group predict the cost of a 24-hour outage for a large e-commerce company would approach US$30 million.
Capacity
Ensure that you have adequate bandwidth on your Internet connection. You'll be able to foil many low-scale DDoS attacks by simply having enough bandwidth (and processing power) to service the requests.
Deploy DDoS Mitigation Plan
Hire Experts , draft and implement plan to mitigate the risk of been attacked
Prevention
Deploy an intrusion prevention system

DDoS Mitigation Plan
Create a DDoS Response team
On-Premises DDoS Defenses are Imperative
Protect Your DNS Servers
Know Your Real Customers
Maintain Continuous Vigilance

Prevention (Technical)
Proper Firewall Configuration
Accept Only dedicated ports
Such as port 80 is reachable directly
Update Subscription
Class Based Queuing
Function of the Linux kernel
Setup different traffic queues
Determines what packets to put in what queue
Assign a bandwidth to each of the queue

Prevention
Traffic Monitor
Monitor
Monitors in and out packet
Checks the hashtable
Server thread
Manager
Analyzes the supplied data
Sorts the IPs in one of several classes

Prevention
Traffic generated by reflector
Reflector enable filtering
Deploy trace back mechanism
IDS/IPS

More Tips to prevent…….
Keep an audit trail that describes what was changed and why.
Create interdepartmental Standard Operating Procedures (SOPs) and Emergency Operating Procedures (EOPs).
Network monitoring isn't enough; your administrators must know your configuration in detail.
Test yourself both locally and over the Internet.
Your processes can harm you just like as hackers.
Keep people aware of old configurations and their purpose.
When something is different, ask why.
Know the trade-offs between simplicity, cost, and survivability.
Protect yourself against hackers.

Practical Challengers
Distributed response needed at many points on Internet
- attacks target more than one host
- wide deployment of any defense system cannot be enforce because Internet is administered in a distributed manner
Economic and social factors
- distributed response system must be deployed by parties that do not suffer direct damage from DDoS attacks
- many good distributed solutions will achieve only sparse deployment
Lack of detailed attack information
- attacks scenarios are unique
Lack of defense system benchmarks
- currently no benchmark suite of attack scenarios that would enable comparison between defense systems
Difficulty of large-scale testing
- defenses need to be tested in a realistic environment
- lack of large-scale testbeds

Thank You !
Q&A

Protecting your business from d do s attacks

by slimsl on Jan 30, 2012

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