Tag Archives: dos attacks

US-CERT warns of NTP Amplification attacks

US-CERT has issued an advisory that warns enterprises about distributed denial of service attacks flooding networks with massive amounts of UDP traffic using publicly available network time protocol (NTP) servers. Known as NTP amplification attacks, hackers are exploiting something known as the monlist feature in NTP servers, also known as MON_GETLIST, which returns the IP address of the last 600 machines interacting with an NTP server. Monlists is a classic set-and-forget feature and is used generally to sync clocks between servers and computers. The protocol is vulnerable to hackers making forged REQ_MON_GETLIST requests enabling traffic amplification. “This response is much bigger than the request sent making it ideal for an amplification attack,” said John Graham-Cumming of Cloudflare. According to US-CERT, the MON_GETLIST command allows admins to query NTP servers for traffic counts. Attackers are sending this command to vulnerable NTP servers with the source address spoofed as the victim. “Due to the spoofed source address, when the NTP server sends the response it is sent instead to the victim. Because the size of the response is typically considerably larger than the request, the attacker is able to amplify the volume of traffic directed at the victim,” the US-CERT advisory says. “Additionally, because the responses are legitimate data coming from valid servers, it is especially difficult to block these types of attacks.” To mitigate these attacks, US-CERT advises disabling the monlist or upgrade to NTP version 4.2.7, which also disables monlist. NTP amplification attacks have been blamed for recent DDoS attacks against popular online games such as League of Legends, Battle.net and others. Ars Technica today reported that the gaming servers were hit with up to 100 Gbps of UDP traffic. Similar traffic amounts were used to take down American banks and financial institutions last year in allegedly politically motivated attacks. “Unfortunately, the simple UDP-based NTP protocol is prone to amplification attacks because it will reply to a packet with a spoofed source IP address and because at least one of its built-in commands will send a long reply to a short request,” Graham-Cumming said. “That makes it ideal as a DDoS tool.” Graham-Cumming added that an attacker who retrieves a list of open NTP servers, which can be located online using available Metasploit or Nmap modules that will find NTP servers that support monlist. Graham-Cumming demonstrated an example of the type of amplification possible in such an attack. He used the MON_GETLIST command on a NTP server, sending a request packet 234 bytes long. He said the response was split across 10 packets and was 4,460 bytes long. “That’s an amplification factor of 19x and because the response is sent in many packets an attack using this would consume a large amount of bandwidth and have a high packet rate,” Graham-Cumming said. “This particular NTP server only had 55 addresses to tell me about. Each response packet contains 6 addresses (with one short packet at the end), so a busy server that responded with the maximum 600 addresses would send 100 packets for a total of over 48k in response to just 234 bytes. That’s an amplification factor of 206x!” Source: http://threatpost.com/us-cert-warns-of-ntp-amplification-attacks/103573

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US-CERT warns of NTP Amplification attacks

How EA, League of Legends & Battle.net Were Brought Down By DDoS Attacks

Last week, a group calling themselves DERP launched DDoS attacks on the servers of a number of the world’s biggest games (and games companies). It seemed like an awfully big list of victims for such a simple and ancient form of attack, but as Ars Technica explain, there was a bit more to it than that. Unlike a standard DDoS attack, which big services like Battle.net and League of Legends would have been able to defeat, the attackers used a new – and obviously incredibly effective – method. “Rather than directly flooding the targeted services with torrents of data”, Ars explains, “an attack group calling itself DERP Trolling sent much smaller sized data requests to time-synchronization servers running the Network Time Protocol (NTP). By manipulating the requests to make them appear as if they originated from one of the gaming sites, the attackers were able to vastly amplify the firepower at their disposal. A spoofed request containing eight bytes will typically result in a 468-byte response to a victim, a more than 58-fold increase.” According to “DoS-mitigation service” Black Lotus, while this sounds bad, it’s easy to protect against. Though, they would say that, wouldn’t they. Source: http://kotaku.com/how-ea-league-of-legends-battle-net-were-brought-dow-1498272633

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How EA, League of Legends & Battle.net Were Brought Down By DDoS Attacks

DDoS Attacks: What They Are, and How to Defend Against Them

You may have heard of a DDoS (distributed denial-of-service) attack in the news as a method used by malicious hackers to attack a website. It’s possible you’ve even experienced the effects of a DDoS attack yourself. If you host a website or other online service, being aware of the dangers of a DDoS attack can help you prevent one, or mitigate the damage they can incur. Here’s a brief explanation of what a DDoS attack is, what it accomplishes and how to avoid one. How does a DDoS attack work? Denial of service through server flooding can be thought of as simply filling up a pipe with enough material to prevent anything else from getting through. Denial of service may occur unintentionally if a server receives more traffic than it was designed to handle. This happens frequently, such as when a low-trafficked website suddenly becomes popular. In this case, the server is still functioning, and is not damaged, but is unreachable from the Internet. It’s been effectively knocked offline, and will be until the DDoS attack either stops or is outgunned by more servers being brought online. Malicious denial of service involves deliberately flooding a server with traffic. The easiest way to do so is to distribute the attacking computers among hundreds, even thousands of computers, which simultaneously bombard the target server with (often useless) requests for information. Think of multiple pipes from various locations eventually connecting into one large pipe, and massive volumes of material eventually colliding from the origin points into the main pipe. While the electronic connections that make up the Internet are not technically “pipes,” there is a limit to the amount of data that can be transferred through any given network. Put enough in there, and a server’s pipes will be clogged. Cybercriminals use large systems of “zombie” computers, or computers infected with malware that allow a central controller to use them, in DDoS attacks. Hacktivist groups like Anonymous, on the other hand, recruit volunteers who install software on their own machines to take part in DDoS attacks. Anonymous has used DDoS attacks against the websites of credit-card companies, dictatorial foreign governments and even the CIA, FBI and U.S. Department of Justice. What does a DDoS attack accomplish? Unlike other forms of malicious computer activity, there is usually no immediate or direct gain for the attacker. The primary goal of a DDoS attack is simply to disrupt a service. A DDoS attack will not in itself allow hackers to access any secure information on its own. There is no network penetration or database breach involved. A DDoS attack can result in a loss of income for a company that does business online. Most of the large online retailers and social networks have hardened their servers to resist DDoS attacks. DDoS attacks by Anonymous and other hacktivist groups are often intended to be a form of protest. In January 2012, attacks on several government agencies and recording labels were staged by hacktivist groups as a form of protest against the Stop Online Piracy Act (SOPA) and the seizure of the file-sharing site MegaUpload by the FBI. Over the past decade, hundreds of DDos attacks have been performed by independent activists, political groups and even government agencies. How can you avoid or mitigate a DDoS attack? Unfortunately, there is little that can be done to avoid becoming the victim of a DDoS attack. Unlike other attacks, it is a brute-force strike that uses a public utility — the Internet itself — to overwhelm a system. Anti-virus software and filtering tools such as firewalls will not stop the effectiveness of the attack. The primary method of dealing with these attacks from the perspective of a host is to increase the capability of the system. Load-balancing tools can distribute requests among many servers scattered across a wide geographical area, and as the system grows to handle more requests, the attackers will need to use a stronger attack to overwhelm it. Methods to limit the amount of traffic allowed to and from the server can be enabled in some routers and switches, and some responsive systems can disconnect a network from the Internet before the attack brings the entire system down. The latter method will still result in the network being inaccessible from the Internet, but will generally result in a faster return to service. Source: http://www.tomsguide.com/us/ddos-attack-definition,news-18079.html

DDoS trojan ferrets SMB data

A new distributed-denial-of-service (DDoS) bot has been discovered targeting real estate companies and other small and medium-sized businesses. Arbor Networks researcher Dennis Schwarz found the malware after receiving a tip-off from a Twitter user. A relatively small number of unique samples and command and control servers were uncovered, making it difficult to judge just how dangerous the new threat could be. These samples are written in the Delphi programming language but most likely originate from Russia, said Schwarz, who added that the bot’s self-preservation tools include UPX packing, string obfuscation, anti-virtual machine, anti-bugging measures, self-modifying code and process hollowing. Command and control is done over HTTP. The analyst firm has a ‘fairly complete picture’ of what the bot represents, but admitted concerns on how Trojan.Ferret is being distributed. “Trojan.Ferret is a new Russian DDoS bot. It stood out to me due to the silly ferret theme and that we have a fairly complete picture of it,” said Schwarz, adding that the company had tracked a sample of bot, the C&C panel view and live C&C traffic. “It is a traditional DDoS bot focusing on the ‘core’ set of DDoS attacks, such as HTTP, UDP and TCP. It lacks the common application layer attacks such as Slowloris, Apache Killer, and RUDY. “A major missing component that we’re unsure of is how this particular Trojan is being distributed–whether by exploit kit, malware-laced spam, or via one of the many ‘dropper/downloader’ networks.” Schwarz said that the Trojan is targeting the UK, the US, Germany, Russia and the Netherlands, as well as Kazakhstan, and said that attacks have hit property companies, an electronics shop, a wedding dress shop and even a politician in Panama. Malwarebytes malware intelligence analyst Adam Kujawa said the information security industry is still coming to grips with the threat posed by the new DDoS bot. “It is likely of Russian origin, uses an array of specialised malware tricks to hide it from detection and of course is used as a DDOS bot,” said Kujawa. “Ferret will infect as many systems as it can to recruit them into the Botnet and then use each of those systems to attack a single server at the same time,” he added, commenting, “A single system cannot perform a successful DDOS attack but a botnet of thousands can.” Source: http://www.scmagazine.com.au/News/368168,ddos-trojan-ferrets-smb-data.aspx

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DDoS trojan ferrets SMB data

7 Security Trends to Expect in 2014

Computer systems, in many peoples’ eyes, are there to be hacked — and that means fraudsters are always working on new ways to exploit vulnerabilities. So what does 2014 have in store? Here are seven security predictions for the New Year. DDoS Attacks Get Sneaky DDoS attackers will go from simple volumetric attacks to ones which take advantage of a site’s specific performance characteristics. That’s the prediction of security researchers at Neohapsis, a security and risk management consulting company. DDoS attacks that intelligently target bottlenecks in performance, such as pages with a high server load (like database writes) or specific network bottlenecks (like login and session management), can magnify the impact over attacks which are simply volume-based and request the homepage of a site. So it’s likely that we will begin to see the spread of tools which profile specific targets. The result? DDoS attacks that have more impact, and involve less network traffic, than the ones enterprises have become accustomed to mitigating against. Insider Threats Remain Major Security Problem According to a CyberSecurity Watch survey insiders were found to be the cause in 21 percent of security breaches, and a further 21 percent may have been due to the actions of insiders. More than half of respondents to another recent survey said it’s more difficult today to detect and prevent insider attacks than it was in 2011, and 53 percent were increasing their security budgets in response to insider threats. While a significant number of breaches are caused by malicious or disgruntled employees – or former employees – many are caused by well-meaning employees who are simply trying to do their job. BYOD programs and file sharing and collaboration services like Dropbox mean that it will be harder than ever to keep corporate data under corporate control in the face of these well-meaning but irresponsible employees. Defending against insider threats requires a multi-layered use of technological controls, including system-wide use of data encryption and establishment of policies stressing prevention of data loss. Security Worries Drive Cloud Consolidation Organizations will look to buy more solutions from a single vendor and demand greater integration between solutions to automate security, according to Eric Chiu, president of HyTrust, a cloud security company. The fact that securing cloud environments is very different from securing traditional physical environments will drive greater consolidation in the market, he says. Legacy Systems Cause More Security Headaches The spate of IT failures in banks and other high profile companies highlights a simple fact: Many of them are running legacy systems which are so old and out of date that they are becoming almost impossible to maintain. That’s because there are few people with the skills and expert knowledge that would be needed to run them securely – even if they were updated to eliminate know vulnerabilities, which they frequently are not. They often aren’t updated because no-one knows what impact that would have. It’s inevitable that we’ll see hackers going after such systems, exploiting vulnerabilities that can’t easily be fixed. Encryption Will Be Revisited In the wake of revelations about the NSA, many companies are realizing that encryption many be the only thing that is protecting their data, and it may not be as strong as they imagined. What’s more, if hackers are led to believe there is a weakness in a particular system – either accidental or intentional – they will pound on it until they find it. As a result, many companies will look to improve the way they use encryption. Look for particular attention to be paid to cryptographic block modes like CBC and OFB, and authenticated modes like EAX, CCM and GCM, advise the experts at Neohapsis. In addition to the encryption methods themselves, look for insights and innovations around key management and forward security. ‘Stuxnets’ Become More Common State-sponsored malware like Stuxnet – which is widely attributed to the United States, Israel or both – has proved to be far more sophisticated and effective than anything that a couple of hackers can develop. Expect more of this type of malware from the likes of China, Russia, Iran, India, Brazil and Pakistan. It’s probably already out there, even if it hasn’t yet been detected. 2014 could be the year that its prevalence becomes apparent. Bitcoin Drives New Malware The Bitcoin virtual currency is growing in popularity with legitimate businesses, and that’s likely to continue. That’s because Bitcoin payments offer significant attractions: They are quick and cheap, and there is no possibility of a chargeback. But Bitcoin wallets make attractive targets for criminals, because stolen coins can be cashed out instantly, without a middleman or launderer taking a cut. And many Bitcoin users are relatively unsophisticated, protecting their wallets with very little security. So expect Trojans and other malware that specifically look for and target Bitcoin stashes, as well as ransomware that demands Bitcoins in return for decrypting data. Source: http://www.esecurityplanet.com/network-security/7-security-trends-to-expect-in-2014.html

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7 Security Trends to Expect in 2014

DDoS attacks lead to 18 percent of data center outages

Maintaining top-of-the-line server performance is a delicate balancing act between power consumption, user accessibility and a variety of other factors both physical and abstract that can affect how well employees do their jobs or how quickly and effectively IT-related tasks are accomplished. Yet in many cases, even the most stringent attempts to keep the data center operating without issue can run afoul due to external forces. In the past, distributed-denial-of-service (DDoS) attacks were a small fraction of the reasons that businesses experienced outages in their IT infrastructure. However, recent findings from the Ponemon Institute reveal that they now account for 18 percent of these problems. This is up from only 2 percent in 2010, when Ponemon last studied the phenomenon. Data centers get caught in the cross-fire Often enough, these attacks are not even targeting data centers, 451 Research analyst Eric Hanselman told Network Computing. Rather, hackers are attempting to shut down the applications hosted in the IT infrastructure, and the servers become collateral damage in the process. Furthermore, due to the heightened sophistication of DDoS attacks, which are now both faster and more effective due to the amount of traffic that can be generated, these assaults are even harder to stop or recover from than ever. “It appears that these attacks are much more frequent and more difficult to contain than other root causes of data center outages,” Larry Ponemon, founder of the privacy and security think tank that bears his name, said in an email interview with Network Computing. Preventative measures begin with server monitoring Due to the problems associated with these attacks, decision-makers should try and stop them as early as possible. Noticing suspicious activity before it causes an outage can help immensely, but that requires businesses to implement server monitoring tools that can notice suspicious activity such as an uptick in traffic. “The most surprising factor was the lack of readiness or preparedness of companies,” Ponemon told Network Computing. “In general, we found several companies completely unprepared to deal with this type of outage event.” The high cost of a DDoS-based outage Those companies that fail to prevent or ready themselves for a DDoS-based outage may find themselves paying $822,000 on average to deal with the problem, second only to the average cost of outages caused by equipment failure ($959,000), according to Network Computing. This is more than double the expense of dealing with problems originating with human error, which typically only amount to $380,000. These costs relate to lost work time, reduced revenue and the repairs themselves, though overall business disruption amounts to 80 percent of the expenses. While an outage may not be quite as expensive to a smaller business, one could cause relatively similar amounts of damage, and all companies should be ready to quickly get back on their feet after these types of incidents. “The cost of unplanned downtime – whether it is the entire data center or one rack of servers – can be a huge unplanned cost for most organizations,” Ponemon told Network Computing. While Ponemon noted that businesses should expect a data center outage at some point, companies should still strive to minimize the possibility of a breach or attack. Putting in the proper safeguards and having a robust disaster recovery plan in place can reduce the amount of time that servers spend out of service. By implementing the right tools to notice and stop suspicious activity that may be the result of a DDoS attack, decision-makers may also potentially prevent about one-fifth of possible outage causes. Source: http://copperegg.com/ddos-attacks-lead-to-18-percent-of-data-center-outages/

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DDoS attacks lead to 18 percent of data center outages

$183,000 fine for man who joined Anonymous attack for ‘one minute’

Authorities in the US have shown their intolerance for so-called ‘hacktivism’ by sentencing a 38-year-old Wisconsin man to two years’ probation and an $183,000 fine for joined an online attack for just a single minute. Eric J. Rosol participated in a Distributed Denial of Service attack (DDoS) against the website for American multinational Koch Industries. DDoS attacks ‘take down’ websites by repeatedly loading them using automatic software. The attack was organised by the hacker group Anonymous and succeed in taking the website offline for only 15 minutes. Rosol pleaded guilty to one misdemeanour count of accessing a protect computer, and although both parties agree that the direct loss to Koch Industries (the second largest privately owned company in the US) was less than $5,000, because the corporation had hired a consulting group to protect its web territory for fees of $183,000 – this was the sum that Rosol must now pay. Koch Industries works in a number of industries including petroleum and manufacturing and reported revenues of $115 billion in 2013. The company is controlled by brothers Charles and David Koch (the world’s sixth and seventh richest men) who inherited it from their deceased father Fred C. Koch, the company’s founder. Koch Industries is often the subject of controversy in the US for its financial support of right-wing Tea Party and its opposition to the green energy industry. The brothers have also donated more than $120m to groups working to discredit climage change science. The DDoS attack which Rosol took part in was organized in opposition to Koch Industries’ reported weakening of trade unions. Source: http://www.independent.co.uk/life-style/gadgets-and-tech/183000-fine-for-man-who-joined-anonymous-attack-for-one-minute-8995609.html

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$183,000 fine for man who joined Anonymous attack for ‘one minute’

Introducing the DDDoSA: Disguised DDoS Attack

The Distributed Denial of Service (DDoS) attack is becoming the crowbar of the online criminal. In the past we have got rather used to DDoS attacks being one of the favoured approaches of hacktivists, with perhaps the Low Orbit Ion Cannon (LOIC) and later the High Orbit Ion Cannon (HOIC) as used by Anonymous to take down sites being the best known examples. However, recent evidence suggests that taking down a site is increasingly no longer the be all and end all of a DDoS attack, instead it’s just a means to a much more profitable end. A couple of weeks ago I reported how a Bitcoin bank robbery took place under the smokescreen of a DDoS attack. I’ve now learned that a DDoS attack on another Bitcoin-related site, the Bitcointalk.org online forum, could also have been implemented as a smokescreen tactic. Information Week reports the site was actually targeted for a password-stealing exercise with some 176,584 users login credentials at risk. Indeed, as TK Keanini (CTO at Lancope) points out there is an established marketplace out there selling the DDoS capability to anyone with the cash, and relatively little of it is needed to attack a smaller company, so the bad guys don’t even need a DDoS strike capability as a core competency any more. “It is almost always the case these days that DDoS attacks leverage blended methods, where the volumetric technique is included, but not the primary objective” Keanini says, adding “this is a sign of what is to come in 2014 as more adversaries just put together a multi faceted compostable attack and instead of having to have all this expertise in-house, they will be able to outsource via these marketplaces that sell these capabilities.” Jag Bains, CTO at DDoS mitigation experts DOSarrest says that his company has been seeing DDoS attacks sending huge amounts of traffic to a website to overwhelm key points in its infrastructure to send the security team scrambling to fight it off as something of a trend. “This serves as a distraction for the security personnel and aims to weaken the underlying infrastructure” Bains explains “once the security operations are no longer cohesive, criminals can use other methods to target intrusion prevention systems to get in and steal information”. All of which just goes to reinforce that maintaining the focus of core operations during a DDoS attack is an ever increasing problem for IT operations. “As DDoS continues to be used as part of a 1-2 punch in cybercrime and data theft attempts” Bains concludes “IT professionals have become stressed in keeping up with the ever increasing size and sophistication of DDoS attacks”. All of which can influence an organisation to resort to what you might call non-standard, or panicked, practices to deal with the ongoing attack. Things such as disabling their IDS platform for example. Things that further compromise the overall security of the network and enable the attackers to pull off the primary attack with ease.

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Introducing the DDDoSA: Disguised DDoS Attack

Bitcoin Password Grab Disguised As DDoS Attack

Attacks against bitcoin users continue, as online forum Bitcointalk.org warns users their passwords might have been stolen in distributed denial of service hack. Aficionados of the cryptographic currency known as Bitcoin might have gotten more than they bargained for recently, after a distributed denial-of-service (DDoS) attack appeared to be used as a smokescreen for launching a password-stealing attack against users of Bitcointalk.org. Michael Marquardt (a.k.a. “Theymos”), one of the administrators of the popular bitcoin discussion forum, Sunday warned its 176,584 members of the attack. He said the attack had been traced to a flaw in the systems of domain registration firm AnonymousSpeech, which specializes in anonymous email, as well as running hosting servers outside the United States and the European Union. Attackers hacked AnonymousSpeech to change the bitcoin discussion forum’s DNS settings to an attacker-controlled server. According to Marquardt, the DNS redirection attack was spotted Sunday by forum manager Malmi Martti (a.k.a. Sirius), who immediately moved the domain to a different registrar. “However, such changes take about 24 hours to propagate,” he warned, meaning that users remained at risk unless they logged on to the forum using its IP address, rather than trusting domain name servers to resolve to the non-malicious site. What was the risk to forum users? “Because the HTTPS protocol is pretty terrible, this alone could have allowed the attacker to intercept and modify encrypted forum transmissions, allowing them to see passwords sent during login, authentication cookies, [personal messages], etc.,” Marquardt said. “Your password only could have been intercepted if you actually entered it while the forum was affected. I invalidated all security codes, so you’re not at risk of having your account stolen if you logged in using the ‘remember me’ feature without actually entering your password.” In other words, anyone who logged into the forum between Sunday and Monday, and who entered a password, should assume that it was compromised by attackers. What were the bitcoin forum attackers gunning for? The most likely explanation would be participants’ usernames and passwords, which — if reused on other sites — might have allowed attackers to drain people’s online bitcoin wallets. Likewise, attackers might have been interested in gathering email addresses of people who are interested in bitcoins to target them — via phishing attacks — with malware designed to find and steal bitcoins from their PCs. The DNS hack and DDoS attack against Bitcointalk are just the latest exploits in a long string of attacks targeting bitcoin e-wallet services and payment systems. Last month, Denmark-based bitcoin payment processor Bitcoin Internet Payment System suffered a DDoS attack that allowed the attackers to hide their real target: online wallets storing 1,295 bitcoins, which they successfully stole. At the time, their haul was valued at nearly $1 million. As that haul suggests, the rise in bitcoin-related attacks can be attributed to the bitcoin bubble, which has seen the value of the cryptographic currency rise from a low of $1 per bitcoin in 2011, to $1,200 per bitcoin as of Wednesday. The rise in bitcoin’s value has lead to a number of malicious attacks, as well as a rise in efforts of a different nature. Last week, for example, Malwarebytes researcher Adam Kujawa warned in a blog post that a number of free toolbars and search agents have begun including bitcoin-mining software, which can consume massive amounts of system resources, slowing PCs to a crawl. Bitcoin mining isn’t inherently suspect. In fact, it’s crucial to the success of bitcoins, because it’s what records the chain of bitcoin transactions. Furthermore, the bitcoin system is set up to reward — with bitcoins — anyone who successfully solves related cryptographic puzzles that help maintain the public bitcoin ledger known as the “block chain.” But some people have begun turning PCs into nodes in their personal bitcoin-mining empire, such as online gaming company E-Sports, which was recently hit with a related $325,000 fine by the New Jersey state attorney general’s office. In the case of toolbars and search agents with built-in mining software, however, users who agree to the accompanying end-user license agreement (EULA) might be authorizing a third party to turn their PC into a bitcoin-mining platform. “So take note if your system is running especially slow or if a process is taking up massive amounts of your processing power; it might be malware or even a [potentially unwanted program] running a miner on your system,” said Kujawa at Malwarebytes. “Looks like the bad guys are adapting all of their various technical attacks and business models to the bitcoin world,” CounterHack co-founder and SANS Institute hacking instructor Ed Skoudis said in a recent SANS email newsletter, responding to the Malwarebytes report. “Given the stakes for rapid money-making here, we’ll surely see even more creative bitcoin-related attacks in the near future.” Source: http://www.informationweek.com/security/attacks-and-breaches/bitcoin-password-grab-disguised-as-ddos-attack—-/d/d-id/1112919

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Bitcoin Password Grab Disguised As DDoS Attack

5 DDoS defence strategies every company should know

If there is any one fact that remains consistent when it comes to distributed denial of service (DDoS) attacks, it is this: whatever mitigation solution your security engineers implement today, hackers will find a way to defeat it within the next two years. The pain of re-engineering a security program every 24 months is dwarfed by the potential pain of DDoS-provoked outages. In 2011, these attacks cost businesses more than a billion dollars, according to the Yankee Group. So how can companies defend themselves against attacks that are growing larger in scale, more complex in nature and more damaging to corporate reputations? Start with these five strategies: 1. Get educated, and be prepared Attackers are highly educated and highly motivated. Whether they shut sites down for financial gain or idealistic causes, the hackers who may target you today will do so with complex attacks at the application layer, Layer 7, where they can deplete your server resources by imitating legitimate users. They are likely to attack websites that rely on SSL by exploiting a Web server’s limited ability to handle large amounts of HTTPS sessions. These are not the straightforward DNS reflection attacks or TCP SYN floods of yesterday 2. Learn which attacks can be defeated with which solutions In order to combat increasingly sophisticated DDoS attacks, your company needs to learn what methods attackers are embracing today and continually research the most effective tools and services for addressing them. For example, you can defeat the OSI model, and Layer 3 and 4 attacks at the network and service layers with access control lists (ACLs), policies and commercially available DDoS mitigation solutions. On the other hand, you’ll need inspection by proxy to identify and fight Layer 7 attacks. 3. Ignore attacker inquiries It’s not unusual for a hacker to contact a company as he is assaulting its websites. You might receive demands if the motive behind the attack is pure financial extortion. If the attacker views himself as more of an activist, he might contact you simply to taunt the company during the outage. The best reaction to these communications is no reaction. Ignore them. Doing so generally lowers the probability that the attack will occur, if it hasn’t already, or that it will continue, if it’s already in progress. 4. Build secure networks Let start with the basics: avoid firewalls. This old security standby maintains the connection state which can be quickly filled by an attacker, rending the system useless and making it easier to take the server offline. This makes even the largest firewalls vulnerable to even the smallest attacks. Look for a hosting provider that can manage and secure your servers or build proxies using load balancers. Load balancers such as nginx or haproxy enable your host to dampen the effect of low-and-slow Layer 7 attacks, which is particularly critical if you are on a Windows Server. Finally, it’s worth it to upgrade your networks to modern equipment. Make sure your service contracts are up to date and purchase products that have a reputation for withstanding prolonged attacks. 5. Have a contingency plan Because hackers are constantly learning and DDoS attacks are constantly changing, you could make all the right decisions and still find your company under fire. That’s why a holistic approach is important. Your business should have secure network and system architecture, onsite packet filters, additional mitigation capacity with a third-party service, and skilled security staff. If you don’t have an in-house security expert, it is all the more essential that you have a DDoS mitigation service on call. Such a partner should be available on short notice and dedicated to helping you during a worst-case-scenario attack. Effective DDoS mitigation doesn’t come down to one solution, one partner or one vendor. Defending your company against attacks requires that you stay educated, stay prepared and stay vigilant. A hosting service with the right DDoS partner can be a valuable asset in your company’s business continuity plan (BCP). Whether you decide to manage your security on-site or outsource it, make sure that you build a DDoS mitigation strategy that accounts for your company’s specific needs, as well as the ever-evolving nature of attack scenarios. Source: http://www.itproportal.com/2013/12/03/5-ddos-defence-strategies-every-company-should-know/