Category: Infosec

Windows Defender Detects Malicious Macros in Real time.

We are seeing an increasing trend of Microsoft office files are being used as Trojans to download malicious payloads by using legitimate features like VB Macros.

If you are running Windows Defender as your default AV, check out this video as how Defender uses its client side ML with AMSI to detect malicous VB macro and blocks it in real time.

This feature doesn’t require any definition.

let me know what you think.

Cheers

 



Artificial Intelligence and Machine Learning for NextGen Threat Protection

Traditionally detecting and responding to cyber threats always relied on understanding precedence, matching patterns, writing definitions and configuring rules based actions for mitigations.

Given the kind of sophistications, polymorphism and expedited rate of change in threat landscape seen nowadays, traditional methods involving human touch at each and every point proving to be inadequate and inefficient.

Rule based action can only scale up to manage commodity attacks but whenever there is a slight difference in the attack technique the whole rule falls apart.

Machine learning and Artificial Intelligence can achieve high rate of precision of detecting and responding to a threat by analyzing various datasets with lots of dimension which human cannot scale.

Just to give you an idea and how polymorphic pattern of threats are emerging :

Machine Learning models can uncover blind spots by removing human bias that comes with expertise, such as confirmation bias to reveal greater insights.

Machine learning for building Threat Intelligence: The Intelligence Security Graph (ISG)

In reducing the time it takes to detect an attack and its techniques, enterprise companies are struggling with a contradictory dilemma between having too much security-related data to process yet still not having enough information to separate the signal from the noise and understand an incident quickly.

The challenge here is not just sheer volume, but also separation. Many indicators of attack either seem innocent on their own, or are separated by industries, distances and timeframes. Without clear insight into the whole dataset, early detection becomes a game of chance. Even the largest enterprise companies are facing these limitations:

  • Real threat intelligence requires more data than most organizations can acquire on their own.
  • Finding patterns and becoming smarter in that huge data pool requires advanced techniques like machine learning along with massive computing power.
  • Ultimately, applying new intelligence so that security measures and technologies constantly improve requires human experts who can understand what the data is saying, and take action.

As a platform and services company, Microsoft’s has a wider optics of threat and activity data comes from all points in the technology chain, across every vertical industry, all over the world. This enables us to diagnose attacks, reverse engineer advanced threat techniques, and apply that intelligence across the platform.

Following image shows how ML can see various signals across the technology chain and helps building threat Intelligence which can help detect attacks much faster and help mitigate.

For nearly two decades, Microsoft has been turning threats into useful intelligence that can help fortify its platform and protect customers. Since the Security Development Lifecycle born from early worm attacks like Blaster, Code Red and Slammer, to modern security services woven into our platforms and services, the company has continually built processes, technologies and expertise to detect, protect, and respond to evolving threats.

These threat intelligence has helped Microsoft to work with law enforcements in various countries in taking down some of the major global botnets like Citadel, Ramnit, Dorkbot, and very recently Gamarue.

Today, with the immense computing advantages afforded by the cloud, the Machine learning and Artificial Intelligence is finding new ways to use its rich analytics engines and by applying a combination of automated and manual processes, machine learning and human experts, we are able to create an intelligent security graph that learns from itself and evolves in real-time, reducing our collective time to detect and respond to new incidents.



The Game of Phishing – How to beat your Opponent

With more than 1.4 Billion clear text user credentials accumulated and up for grabs in the dark web clearly indicates that the hunt for credentials from genuine users/Organizations is the most important phase of the the cyber kill chain.

Verizon Data Breach Investigation report 2017 says that 81{133ac7b6b546e3a9292346674892cfa2a474ed03d372a26bd3c9b466588878a9} of breaches that have occurred involved compromised credentials and in 75{133ac7b6b546e3a9292346674892cfa2a474ed03d372a26bd3c9b466588878a9} of them perpetrators were outsiders.

Phishing emails are proving to be most effective way to grab credentials of users and then use them to carry out attacks on them and their organization.

If you are new to this term, This should help.

image

The Mind Game

Over the years, the art of phishing has evolved and adversaries are now using more sophisticated ways to trick human mind in making a wrong judgement.

If you are fan of National Geographic’s popular show “Brain Games” like me, they’ve showed how amazing ways human brain functions. How a part of brain questions everything, sees with suspicion before making any decision and how another part of brain which simply accepts the fact and assumes it as true and takes the action.

For E.g, When you are about to cross the road, A part of brain looks at this scenario with suspicion and caution. It only makes decision to cross the road after determining that there is no threat to life from incoming vehicle. Lets call this part of the brain – Part 1

However on a different scenario, when you pickup a TV remote and about the press the power button, does you brain sees this act with same level of caution and suspicion? No, right? This time the other part of the brain makes the decision by assuming that when you press the button, the TV will turn on and nothing bad will happen. Lets call the part of the brain Part-2.

Adversaries are now using various physometeric tactics to let your Part 2 of brain acts and makes you take quick decision to act swiftly on the email and supress your other side of the brain which makes you question it.

Lets play a game.

Can you tell which of the following screenshot of the Office 365 Logon Page is a Phishing Page and which one is authentic webpage?

Fig.1

Fig 2

If you happen to land on one of these webpages and provide your credentials, You have just made a life of a attacker easy by handing over one of your organizations critical asset, your Username and Password.

So what could really happen when someone else have your credentials?

1. They can logon to your mailbox and use your email account to send with emails with Malicious attachments to all your colleagues. Since all your colleagues trusts you they will not use their Part 1 of brain to think twice before opening those attachments.

2. They can use your mailbox to attack your friends/family similar way.

3. They can use your mailbox to spear phish senior leaders of your organization to grab their credentials and elevate privileges.

4. They can VPN and connect to your corporate network as you and initiate exploration and then exploitation activities or just spreading a worm based ransomware in the network.

5. and much more Smile

How to be better than the game?

Detecting Signs on a Phishing Email

1. Sense of Urgency – Look for the sense of urgency in the email. If the email is asking you take an action in hurry with words like immediately, Urgently etc, be cautious.

2. Grammatical errors or spelling mistakes- More often or not, attackers from non native English speaking regions tend to make spelling or grammatical mistakes in their emails or on the Phishing site.

3. Spoofed Email Sender – Do not trust the email sender name on your email header. While it might look its coming from known sender but when you expand the Email Name, you may see a different email address (spoofed)

4. Obfuscated URLs : What you see my not be what you get. Hover your mouse on the Links to see the actual URL its taking you to. If you see Base64 in URL, move away.

5. Detailed Email Header – If you are ready to dive deep, Look at the detailed email header to review the complete mail flow and sender Info including IP address and Sender Domain.

6. Email formatting – Emails coming from various reputated organizations goes through multiple review w.r.t formatting. if the email looks weirdly formatted it may be anomalous.

 

Detecting Signs of a Phishing website.

If you do end up on a site by clicking on those URLs in your email, following tips can help detecting it a Phishing Site.

Yes, it would be really taxing to check every email with suspicion and open every links in the email and verify the webpage for signs of phishing.

If you are an Office 365 customers,  Advanced Threat protection of O365 protects against phishing attacks by analyzing the URLs in the emails and blocks the access to the malicious website at the time of click.

If you’d like to see a short demo on how Office 365 ATP Safe link protects against Phishing attack, check this video

To learn more about the Safe Link capabilities of Office 365 ATP, check here

PS: If you have not been able to figure out yet, Figure 2 is a phishing page 🙂

Cheers

 

Originally Published On https://blogs.technet.microsoft.com/iftekhar/