Tag Archives: virus

Email Security – A Buyer’s Guide

All IT professionals know that most of the cyber attacks begin with an email. Actually, according to statistics of Phishme Defense Guide 2017, 91% of cyber attacks began with an email. It is not surprise, since all we know that the human is the weakest part of cyber defense. If the users have not enough awareness – this might be the IT professionals’ fault of course – and especially, with today’s carefully designed phishing emails, users can easily download the malicious content or steal their identity. These phishing attacks and users make it easier to breach an organization for cyber criminals, instead of scanning the vulnerabilities on websites, and applying complex techniques to obtain the same gain.

As we told at the beginning, most of the successful attacks begin with phishing emails. Attackers may send a malicious content directly via email, or a link to a phishing site to download the malicious content or to a CnC server. Sometimes, to bypass the security devices, attackers may leave the back of the link empty at the beginning, then add the malicious content, so the users can download it once the link bypassed the security controls.

Traditional signature-based or reputation-based email security controls cannot stop these types of attacks. Signature-based controls cannot stop 0-day threats, and criminals uses unique malwares, URLs or phishing sites to bypass these signature-based security control mechanisms.

Most of the antispam solutions work like that, with including an antivirus to their solution. As explained, even if it is not enough, spam is also a very big problem against organizations, since more than 90% of emails reaching to an organization are spam emails. So, while choosing an email protection solution, antispam feature is one of the most important capabilities you have to check. If you do not stop known spam mails, it will be very difficult to combat against more sophisticated email attacks while trying to manage too many spam messages.

Feature 1: Antispam
As explained top, more than 90% of emails are spam in an organization. Most of these spam mails do not contain malicious content and just contain information about a sales campaign. Reputation database mostly used in cloud with intelligence of the vendor and other customers’ feedback. So, both intelligence capability and size of the customer becomes important for the vendor. It is important to note that some vendors use different black lists for more protection.

Also, antispam engine must be tested carefully, especially if the most used language in the organization’s is not English. Tool’s antispam engine capability may differ for different languages.  

Although spam mails are not very dangerous, they are annoying, due to the volume and content of some of them.A good antispam engine and reputation capability stopping these spam mails also provides a better analysis chance on remeining emails by reducing the number of the emails with stopping at the edge.

Feature 2: Antivirus
Like antispam feature, a signature-based antivirus feature can stop most of the known malicious contents sent to organization. Different email security vendors use different antivirus solutions in their solution, so even if you do not trust directly to the antivirus feature, it is important to use a well known vendor’s solution here.

Feature 3: Sandbox
With today’s developing attack types and more aggressive and focused attackers, sandboxes became mandatory for organizations. I do not want to explain the features of the sandboxes here but today, a sandbox that analyzing emails became very important. In traditional antispam solutions, antivirus engine can only stop known malwares. Organizations need a sandbox for analyzing both unknown files and URLs. For suspicious URLs, masking feature also can be used. So, users’ direct Access to the suspicious URL could be blocked.

Sandboxes for email protection can be completely from a different vendor from antispam solution, can be positioned after these antispam products to analyze remaining email after antispam or a cloud solution if the organization does not have a regulations against using cloud solutions.

Feature 4: Quick Response
Organizations receive thousands of alerts everyday. Most of the organizations do not have enough analysts to determine all these alerts whether they are true attacks or false positive. Even worse, most email security solutions do not give enough information to determine the alert. For responding quickly, a solution giving more detailed analysis about the content should be choosen.

Feature 5: End User Quarantine
One of the worst parts of email security gateway solutions is the false positive rates. Since attackers create more realistic emails to cheat the users, stricker rules may be required. The stricker rules mean more false positives. Emails required fort he work of the user lso begin to be blocked. Of course, this situation leaves IT professionals in trouble. This situation leads they leave all their important tasks and have to spend time clearing emails from quarantine. So, the end user quarantine feature that allows the user to manage their own quarantine and release the emails they think is clean is as important as the false positive rate.

One bad thing about end user quarantine, users can really release suspicious emails to themselves. So, this feature should be used very carefully. Workload or security? One more thing to think on for deciders.  

Feature 6: Scalability
With developing business models and growing organizations, scalability is always an important point. Not only email protection but also all security products should be scalable. These should be especially discussed during PoCs. Again, for the organizations do not have a regulation agains cloud usage, scalability becomes easier for native cloud solutions.

Questions To Ask
While choosing an email security gateway product, it is better to ask these questions to the vendors;
1-    Does the solution use multiple Technologies also including AI?
2-    Does the solution provides intelligible reports against suspicious or malicious activities for responding quickly?
3-    Which technologies does the solution have for identifying 0-day attacks?
4-    What is the false positive rate of the solution?
5-    Is the solution fed from any intelligence source?
6-    What is the quality of these intelligence sources?
7-    Can it be quickly updated against new threats?
8-    What is the success rate in preventing suspicious URLs?
9-    Can the solution share threat information with other security tools positioned at the organization?
10- What is the scalability capacity of the solution?

Fall of A Hero – Rise and Fall of AV

All IT Security experts surely faced with such situations that anyone who does irrelevant with security, know only AV about computer security. AVs was the hero of our security for long times.

Legendary Times
AVs begin their advanture as signature based protection against known viruses and worms. With the development of the threats; fisrtly with script kiddies, than financially motivated hacker groups, it was enough to update signatures weekly or every few days. Today, things work a little differently. Actually, much more differently. As mentioned in the “A Guide to Choose EDR” blog before, with the explosion of the connectivity between PCs and mobile devices, usage of cloud more day by day, threats have also changed. Attackers now have the ability to bypass signature based detection and protection technologies. For dealing with these situations, heuristics detection skills have been added to AVs. Machine learning and behavior monitoring added for detecting and blocking suspicious behaviors. Also, AV vendors added host based IDS/IPS, hostbase firewall and device control skills, and these features become very useful for admins, to use all of these features within one agent, while this agent is already deployed in all PCs.

Fall of the Hero
Despite all these new features, researches conducted after 2018 say that AV products misses more than %50 of attacks. Besides, false positives caused by constantly updates causes difficult situations fort he IT professionals.
Everyone accepts that there is no any solution providing %100 security. With this approach, speed of response and visibility become the key features against threats. This is the reason SIEMs must be used to complement to AV. Yet there are also caveats that it is not enough and advanced tools like endpoint detection and response (EDR) solutions must be implemented alongside AV. That must be true, at least we see that AV vendors are also now developing such solutions beside their AV solutions. You can access to a more detailed review of EDR solutions; what they must include and how to choose them here.

What is next?

Now, AV vendors thich are also developing EDR solution, suggest that the customers must implement these solutions beside the AV. Meanwhile, the vendors developing only EDR solutions, or vendors which entered endpoint field with EDR, say that customers can change their AV with EDR solutions peace of mind. But is it so easy to replace AV with EDR? Or simply, is it easy to change any AV with something else.
As mentioned before, companies are now using their AV agents for device control, host IDS/IPS, host firewall, application control and whitelisting. For replacing the AV, the new product must support these features, even if the solution is very success in detecting and responding. Meanwhile, event if the solution has these features, there are too many policies, rules and exceptions for all. I am sure all IT Professionals will be afraid of this replacement since these policies. Until overcoming these problems, it seems better to use EDR beside AV solution. For now, it is also important to use a vendor that have enough working experience with commonly used AVs.

A Guide to Choose EDR

As spoken in all security events in last decade, the attacker’s purposes and methods have changed greatly and become more complex. As if this is not enough, increase in the number of the mobile devices used in the organizations and moving some (or most of the) services to cloud made endpoints’ protection more difficult. With the expanded cloud usage and development of the mobile technologies, more users are coming less to the Office. This situation makes management, monitoring and protecting more difficult for the endpoints.

As said at the beginning, with the new advanced techniques of the attackers (like advanced malwares, fileless malwares or exploits), it is very difficult to protect endpoints with only traditional endpoint security solutions. Neverthless, as the subject of another discussion, this does not mean that signature based antivirus, host IPS, host firewall or other conventional endpoint security solutions meaningless anymore.
Meanwhile, while talking about traditional security solutions, we have to touch what endpoint is. Because, attack surface increased against today’s organizations, since IoT and OT are parts of the endpoints’ of them. Now, we need to expand endpoint security solutions as covering mobile phones, POS, wearable devices, sensors, cameras, HVAC, and cars, since they can access both to internet – even if confined with the cloud – and organization’s network, wherever they are and whenever they want.
According to this traditional endpoint security solutions, EDR solutions have malicious activity detection, containment of the endpoint, investigation of the incident and remediation capabilities fort he endpoint. With this capabilities, they can reduce the impact of an incident in the organization and provides intelligence for responding faster.
EDR systems use an agent on each endpoint system. EDR vendors feed these agents with their intelligence services, global customer data, firewalls, network and/or e-mail based APT devices, etc. With these intelligence data, the agent provides deep and real-time monitoring on the endpoint, discovery and response.
An EDR system must use at least a few monitoring methods such;
IOC Detection, means that the agent is comparing the system changes with its Indicator of Compromises. This IOCs can be feed from other devices of the vendor in the same network, or global customers and intelligence services.
Anolmaly Detection, means checking the system for anormal states.
Behavior Detection, means checking the system for bad or malicious behaviours.
Machine Learning and AI, means that the solution has the ability to determine the malicious activities without being explicitly programmed.
For an effective tussle against threats, time is the most important thing. Your EDR solution should help you detect, investigate and response  as quickly as possible. For doing this, first, your EDR should detect the threat as soon as possible. Right here, the power of the tools mentioned above shows the importance of their capabilities.
Power of the intelligence services of your EDR solution’s vendor, shows the power of the IOCs. A vendor should feed customers’ EDR with fast and effective intelligences. Also, as community data, vendors can feed their customers with other customers’ known bad data. This means, bigger community helps you better.
Also, integration with other security tools in the network is a key point. If an EDR solution can be fed with the other network tools, endpoints can be ready for the threats seen elsewhere, like in network traffic or in an e-mail. When we think that the malicious software reaches to the endpoint via e-mail or network channel, this feature becomes very important. With the integration and the advanced search capabilities in the EDR solution, a threat that seen in network anywhere can be catch quickly in the endpoint. From here, we also must see that an EDR solution must include an advanced search feature, searching the endpoint by many different options. These advanced searching options helps admin searching his clients against possible threats.
An EDR solution must provides clear and meaningful explanations about the threats. Only determining a threat is not enough for admins. The solutions must help them responding to these threats. For responding quickly and correctly, admins must understand the content of the threat. Also, containment is an important feature fort he EDR solutions, a time-saving feature for the admins, while they are working on the threat. An endpoint has a malicious content should be contained during the analysis, so other endpoints prevented against spreading of this malicious content.

Also, for investigation, EDR solution must provide a full state output of the endpoint, for the timezone that the malicious thing happen. A full or specific memory dump information, states of the services, etc. An automatic creation of these information is critical during the investigation processes.
From the experiences, I know that the endpoint is the most boring and difficult part of the security. Distribution problems, slowing machines after distributing, user complaints, etc. Most of the security admins don’t like to deal with the endpoint security. But as shown in most studies, thousands of threats are produced every day. Just protecting the network and a-mail channel is not enough for these new threats. We have to give the necessary importance to the endpoints. So, with all these problems of endpoints, choosing the right vendor becomes the most important thing. An endpoint security solution must not obstruct end users’ business. Even for security, business must go on. At this point, vendor’s experience is very important to choose. Also, getting a quick answer during a problem must be evaluated, during the selection process of the EDR solution.