2 Lock Down Your Servers Look Before You Load Between 2011 and 2012, ninety-four per cent of all data breaches involved servers in some way. 1 It s hardly surprising for criminals, the simplest route into your network is wherever the weakest point is. Too bad that s often your servers. As the doorways to your company s network, the very functionality of mail and web servers makes them both highly vulnerable and desirable targets. Criminals use a variety of methods to seek out and exploit weak spots, targeting everything from software vulnerabilities to human error, gaining a toehold on your network from which they can launch more extensive attacks or steal vital business information. s pivotal role in business communications has made it a particularly useful attack vector. Every day, 89 billion business s are sent and received worldwide. 2 Kaspersky Lab researchers have found that, as of September 2012, 72.5 per cent of all traffic is spam; malicious files were found to account for 3.4 per cent of all s. Over on the web side of the fence, Google s bots detect 9500 malicious web sites every day. In Q2 of 2012 alone, Kaspersky Lab detected and neutralized over one billion threats and a total of 89.5 million URLs serving malicious code. An estimated 80 per cent of attacks are aimed at web-based systems. 3 Traditional anti-virus software on its own can t deal with today s blended, constantly evolving threats. Nor can IT professionals keep track of everything that s hitting their servers. Best practice calls for a comprehensive approach to server protection, using technology that can, among other things, filter out threats before they hit your network, block malicious content without impeding legitimate information and protect your servers without impacting on performance. Here are some steps you can take and technologies you can implement that can help ensure your mail and web servers run at optimal security and performance levels. 1 Verizon: Data Breach Investigation Report Radicati Statistics Report Top Cyber Security Risks Report, HP TippingPoint DVLabs, SANS Institute and Qualys Research Labs, September 2010
3 PROTECTING YOUR MAIL SERVER s pivotal role in businesses of all sizes makes it the most vital and vulnerable link in the business chain. It s not just a communications tool increased functionality has seen used for document archiving, conferencing and calendaring, among other things. Research undertaken by the Enterprise Strategy Group indicates that up to 75 per cent of intellectual property is sitting in data stores. No wonder servers continue to be such an attractive target for criminals both as entry point to the network and as source of commercially-sensitive information. PROBLEM: As any IT administrator knows, and groupware systems are under almost constant attack from spammers and criminal hackers. Even if they re not successful at stealing data or compromising your network, spammers can cripple bandwidth, while hacks such as relay theft can interfere with effective communications and cause network instability. SOLUTION: Keep spam off your networks before it can cause trouble Effective filtering: The best way to deal with spam is to block it before it hits your networks, minimizing the financial and resource costs associated with it. Intelligent, highquality spam filtering technologies extend well beyond traditional, static keyword or block lists to include: Proactive monitoring: Best practice calls for a solution you can train to know the difference between content you want to block and information you need. This is achieved by constant, automatic monitoring of messages to train the spam engines to learn what can be rejected straight away and what can be quarantined or delivered. Reputation filtering: Spammers change tactics all the time. Even a simple tweak to a keyword can confuse traditional spam filters. Reputation filtering categorizes spam in such a way that it can block new attacks, even if the text of the message has been altered slightly. This not only helps keep you on a proactive footing, with near real-time protection, a high quality solution will allow you to block certain kinds of attack rapidly, without the need for analyst review. This saves you time and resources. Black AND white: DNS-based blacklists are one of the most effective configurations you can use to protect your mail server. These check message sender domains or IP addresses against global lists of known spammers choosing a solution that gives you access to the maximum number of Domain Name System Block List (DNSBL) will enable you to greatly reduce the amount of spam getting through. Features allowing you to configure customized allow/deny lists at both administrator and user levels will give you greater flexibility and granular control over messages. Developing your own local blacklist can take time but is worth the effort, as it will help block spammers who target your servers specifically. Head for the Cloud: Constantly updated lists on a real-time database in the Cloud gives you an additional layer of protection, over and above your local lists and the lists on your solution s update servers. This gives you a rapid anti-spam response stance.
4 Identify targeted attacks: Criminals are increasingly launching attacks specific to an individual business. Highly tailored spam or malware geared towards specific themes or concerns in a given business is becoming a key vector for this kind of attack. As relatively few computers are involved in a targeted attack, there is no infection outbreak that could normally be used to help identify malware early on using statistical methods. Kaspersky Lab s ZETA Shield technology protects against targeted threats by scanning data streams for code fragments that are characteristic of exploits built into legitimate files. ZETA Shield s ability to work with data streams rather than individual files allows for better integration with server applications. A key feature of this technology is its ability to conduct more in-depth analysis of incoming data, identifying non-standard elements and the connections between them, which may be indirect indicators of potential threats; traditional anti-virus solutions break objects into individual components to be studied separately, increasing latency and lowering overall performance. Enforce updates and adopt a zero hour approach: One distinct feature of spamrelated cybercrime is the hit and run nature of most attacks. Roughly half of any spam assault is delivered inside the first 10 minutes, meaning response times have to be just as fast. Kaspersky Lab s new solution integrates intelligent technology with a new Enforced Anti-Spam Update Service, offering rapid delivery of anti-spam database updates. This allows most spam to be quickly and efficiently blocked. PROBLEM: Relay theft Many spammers exploit vulnerabilities in groupware servers to steal the bandwidth they need to distribute massive volumes of spam. In other words, they use your servers to distribute their spam messages passing all the costs and resource problems, not to mention angry customers, onto you. As a final insult, this often results in legitimate business communications being delayed while your overloaded server copes with pushing out the spam messages. SOLUTION: All mail servers allow you to set restrictive mail relay parameters that specify precisely for whom your SMTP protocol should forward mail. Do it. PROBLEM: Denial of Service (DoS) Denial of service attacks can bring your mail (and web)servers and network infrastructure to a complete halt by flooding them with spam, sending more requests than it s able to handle. SOLUTION: Limit the number of connections allowed to your SMTP server. Arriving at optimal numbers for acceptable loads can take time, and will depend on server specifications such as CPU and memory, but you should base parameters for connection limits around the total number of connections, number of simultaneous connections allowed and the maximum number of connections you can support.
5 ANTI-SPAM + EFFECTIVE ANTI-MALWARE = COMPREHENSIVE SERVER SECURITY Spam isn t just a performance and resources issue as Kaspersky Lab s spam analysts have found, it s becoming more and more dangerous. Recent developments include the increased use of malware that can infect an computer simply by opening and . Spam also increasingly contains malicious links and fraudulent messages. Malware in s today is also likely to be highly mutated, with no known signature or behavior pattern, meaning that an average web or spam filer won t pick them up until it s too late. In July 2012, Kaspersky Lab noted a 50 per cent increase in the number of mails containing malicious files. Malware often opens up an entry point onto the network following a successful, well-targeted spam attack, such as a phishing that persuades a user to click a seemingly legitimate link or open a seemingly legitimate file. The high profile RSA attack in 2011, for example, was executed via an infected Flash file embedded in an Excel spreadsheet entitled 2011 Recruitment Plan. This mail was sent to only four, well targeted employees. The one person who opened the attachment retrieved the mail from their junk mail folder. Viruses, worms, spyware and other malicious programs Spam 61% 65% 56% 60% Phishing attacks 35% 35% Network intrusion / hacking 23% 23% Theft of mobile devices (smartphones/tablets) 20% Denial of service (DoS), Distributed denial-of-sevice attacks (DDoS) 18% 17% Theft of other hardware 13% Corporate espionage 11% 13% Targeted attacks aimed specifically at our organization / brand 8% 9% Criminal damage (including fire/arson) 4% 4% None 9% 8% % Of Organizations Experiencing An Event That Affected Security The most common threats faced by IT specialists are malicious programs and spam.
6 An anti-spam/anti-malware combination can give you the strength in depth you need to keep criminals off your server and network infrastructure. To complement your anti-spam stance, look out for features such as: On-demand malware scanning: Scan messages and attachments before they reach your mail server or endpoint. Scan documents shared using collaboration tools such as Microsoft s Sharepoint or Lotus Domino. Real-time protection/zero-hour capabilities: Frequent, automatic updates, real-time scanning and protection and access to a global, constantly updated global malware signature database will keep your anti-malware stance optimized. Keep it quiet: End users are quick to complain and will often seek to disable or bypass any processes they perceive to impact on system performance. Choose a solution that allows scans to run in the background, without interrupting users, allowing them to get on with their work. WWW Mail Traffic Web Traffic Quarantine Users Kaspersky s Mail & Web security solutions filter out malicious s, web sites and spam before they reach the endpoint.
7 PROTECTING WEB TOO Web servers are highly targeted by criminals. Many IT administrators take steps to protect the company website from attack but leave the server hosting it (and all the applications and network connections associated with it) vulnerable. Here are just a few tips for locking down your Web server: Disable unnecessary services and application extensions: You re pressed for time. You don t have the resources. So you install the operating system on its default settings and hope for the best The problem with doing this is that many network services you don t need are left running, keeping ports open and using up system resources unnecessarily. Common culprits here include remote registry services, remote access and printer servers. Don t just switch them off, disable them ensuring that they don t re-start the next time you have to re-boot the server. Keep a tight grip on remote access: This is difficult when workforces are increasingly mobile, but where possible, only ever log into your web server locally. If you have to do so remotely, use tunneling and encryption to at least ensure the connection is secure. Where possible, restrict remote access to a specific number of IP addresses and accounts. Test in private: You re testing out the new web site or the application you re working on. You know it s full of vulnerabilities, so why have you left it sitting in a public directory, helpfully named test or new application for anyone to find and hack into? Test out new projects on a server that isn t network connected and keep it well away from business-critical databases. Keep permissions to a minimum: Assign the bare minimum of privileges needed for any specific service to run that way, even if a hacker or a malicious piece of code gets a toehold, they can t use that compromised service to carry out other tasks on your server. Patch early, patch often: Keep your system as secure as possible by ensuring you re running the latest version of the operating system, complete with all the latest security patches. Best practice here involves choosing a solution that will allow you to automate and enforce updates, so your server security is always up-to-the-minute. Monitor everything: Check logs regularly for suspicious activity. A centralized, single-pane-ofglass view of your network and web server will help you keep a close eye on what s going on Trojan-Downloader.SWF.Voleydautor.h Hoax.HTML.FraudLoad.i AdWare.Win32.IBryte.x Trojan-Downloader.JS.Iframe.czo Hoax.HTML.FakeAntivirus.ds Trojan-Downloader.JS.Agent.gsv AdWare.Win32.Screensaver.e Backdoor.MSIL.Agent.gyb Trojan-Dropper.VBS.Agent.bp Trojan-Downloader.JS.Iframe.dal Web-borne exploits: Out-of-date, insecure web browsers can leave organizations exposed to attack from malicious sites or other malware. Kaspersky Lab research has found that many older malicious programmes are still in use because they re still efficient. The key reason for this is continued use of out-of-date browsers and other web-based software and applications. Kaspersky research found that, in 2012, more than one-fifth of users were running out-of-date versions of their web browser
8 SECURING THE WEB EXPERIENCE Effective anti-malware software adds an additional layer of security to web gateways, ensuring secure web access for everyone in your organization. Best practice requires automated removal of potentially malicious programs in HTTP(S), FTP, SMTP and POP3 traffic, but it s important that you also select a solution with load balancing capabilities, reducing the workload on your server or gateway and ensuring that everything runs smoothly. Optimized, intelligent scanning takes a lot of strain off your servers and gateways flexible solutions allow you to be flexible about what you scan, and when, increasing performance and reducing resources needed for effective scanning. It s not just about scanning, however. Management tools and other features can drive an even more effective, secure web experience for both administrators and users: Combined URL and content filtering: As Google s bots have shown, many web sites contain malicious code. It s not just compromised web sites on a daily basis, criminals launch and remove new, deliberately infected sites to catch unsuspecting users out. Users often don t even have to download anything simply visiting the site is enough to infect them through unpatched vulnerabilities in their browser or other web applications. End users may not know the risks, but IT administrators do. You can t lock down the web, but a combination of URL and content filtering means you can control not only how your end users interact with the web, but how the web interacts with your networks. URL filters recognize malicious sites and prevent users connecting with them. Content filters allow you to control what sort of content users can access, or limit the functionality of sites that may have been infected. You can do both without impacting on system performance and with complete end user transparency. Apply your roles-based security policies based around: Individual Group policy Category Web content. Ensure that both your global URL and Content filtering databases and services are automatically updated from a constantly monitored, real-time database.. Monitoring and reporting: Gain complete insight into what s happening on your network by running a solution that allows you to easily access information such as: Blocks per day: Number of blocked requests over any selected period of time. Top categories by connection: The most frequently addressed web filter categories by the number of requests. Top users by block: The most frequently blocked users. Top users by connections: Display your top users by request numbers. Effective monitoring gives you insight into how your users interact with the web, facilitating more effective policy refinement. It also enables you to support productivity initiatives within the business while ensuring strained resources aren t further burdened by bandwidth-hungry-yet-unproductive end user activity.
9 AN INTELLIGENT RESPONSE TO THREATS Organizations need intelligent security technologies to protect their data and they also need intuitive and uncomplicated IT efficiency tools. Kaspersky Lab s 2,500 employees are driven to meet those needs for the 300 million plus systems they protect and the 50,000 new systems a day that are added to their number. Kaspersky Mail and Web Security solutions offer world class security for mail servers and internet gateways. Both are components of Kaspersky Endpoint Security for Business. Combining award-winning anti malware and anti-spam, IT policy enforcement tools, centralized management and cloud-assisted protection, Kaspersky s business security products are the right choice for your organization. Talk to your security reseller about how Kaspersky can bring secure configuration to your servers, gateways and the networks they run on and more!
10 Kaspersky Lab ZAO, Moscow, Russia All about Internet security: Find a partner near you: Kaspersky Lab ZAO. All rights reserved. Registered trademarks and service marks are the property of their respective owners. Lotus and Domino are trademarks of International Business Machines Corporation, registered in many jurisdictions worldwide. Linux is the registered trademark of Linus Torvalds in the U.S. and other countries. Google is a registered trademark of Google, Inc.
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Devising a Server Protection Strategy with Trend Micro A Trend Micro White Paper Trend Micro, Incorporated» A detailed account of why Gartner recognizes Trend Micro as a leader in Virtualization and Cloud
HOW TO PREVENT SPAM AND MALWARE IN MAIL MOST EFFECTIVELY Index 1. Battling the increase in malware 2 2. Addressing the surplus of spam 3 3. The mail server A critical vulnerability 4 3.1 Denial of Service
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Contents Paul Bunyan Net Email Filter 1 What is the Paul Bunyan Net Email Filter? 1 How do I get to the Email Filter? 1 How do I release a message from the Email Filter? 1 How do I delete messages listed
Comprehensive Anti-Spam Service Chapter 1: Document Scope This document describes how to implement and manage the Comprehensive Anti-Spam Service. This document contains the following sections: Comprehensive
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