LogJam, Little Sister of FREAK

On May 20, 2015, researchers from the University of Michigan announced a new vulnerability in the Diffie-Hellman key exchange, called LogJam.

The vulnerability resides in the basic design of TLS itself, exposing both clients and servers, including mail servers, to a MitM attack, in which a malicious attacker can downgrade SSL-based connections to 512-bit export-grade cryptography, thus bypassing the basic security mechanism and allowing the attacker to read and modify any exposed traffic.

According to the official publication in weakdh.org, “The attack affects any server that supports DHE_EXPORT ciphers, and affects all modern web browsers. 8.4% of the Top one million domains were initially vulnerable.” Moreover, the flaw exploits a vulnerability in the Diffie-Hellman TLS key-exchange protocol, rather than the RSA key exchange exploited by the FREAK vulnerability.

When a client requests a DHE_EXPORT cipher-suite instead of DHE, the server (if it supports DHE_EXPORT) will pick a small, breakable 512-bit parameter for the secret exchange.

According to a CloudFlare publication, this is the protocol flaw at the heart of LogJam “downgrade attack”:

  • A MitM attacker intercepts a client connection and replaces all the accepted cipher-suites with only the DHE_EXPORT ones.
  • The server picks weak 512-bits parameters, does its half of the computation, and signs the parameters with the certificate’s private key. Neither the Client Hello, the client cipher-suites, nor the chosen cipher-suite are signed by the server.
  • The client is led to believe that the server picked a DHE Key Exchange and just willingly opted for small parameters. From its point of view, it has have no way to know that the server was tricked by the MitM into doing so.
  • The attacker would then break one of the two weak DH shares, recover the connection key, and proceed with the TLS connection with the client.

LogJam_1

Moreover, the researchers have speculated that the LogJam vulnerability provides an explanation for how the NSA cracked VPN connections, saying “a close reading of published NSA leaks shows that the agency’s attacks on VPNs are consistent with having achieved such a break.”

Further to the publication of the LogJam vulnerability, SenseCy monitored its popularity among known hacker groups and cyber hacktivist. A general interest was noted, with some questions on the vulnerability.

LogJam_2

So how should you approach this vulnerability?

The researchers provided some simple answers to this question:

If you run a server:

If you have a web or mail server, you should disable support for export cipher suites and generate a unique 2048-bit Diffie-Hellman group. Step-by-step instructions can be found here.

If you use a browser:

Make sure you have the most recent version of your browser installed, and check for updates frequently (including smartphones).

If you are a system administrator or developer:

Make sure any TLS libraries you use are up-to-date and that you reject Diffie-Hellman Groups smaller than 1024-bit.

You can check if your browser is vulnerable here.

You can download the complete research document from here.

AnonGhost VS Uncle Sam (#OpUSA – May 7, 2015)

Hacking group AnonGhost has published an official video on #OpUSA, its upcoming cyber campaign against the United States. The video, addressed to the U.S. government, does not mention the date of the campaign or the list of targets, but based on the group’s 2013 #OpUSA campaign, it appears that it is set to take place on May 7. The official video’s YouTube page mentions prominent AnonGhost members Mauritania Attacker, An0nx0xtn, DarkCoder, Donnazmi, and Hussein Haxor, all of whom promote the group’s agenda in social networks.

AnonGhost post about #OpUSA

AnonGhost post about #OpUSA

On May 7, 2013, AnonGhost, along with other groups such as the Tunisian Hackers, threatened to hack American government and financial websites. While they were highly motivated, they failed to achieve much other than to deface several websites and leak emails and personal information. A possible reason for their limited success is that several days before the campaign, hackers speculated on social media that #OpUSA was actually a trap set by the federal government in order to expose and arrest the participants.

Partial list of #OpUSA targets in 2013

Partial list of #OpUSA targets in 2013

One of the groups that participated in 2013, N4m3le55 Cr3w, published a long list of recommended DDoS tools at that time, most of which are common hacking tools that are likely to be used in the current campaign as well.

  • HOIC
  • LOIC
  • Slowloris
  • ByteDos
  • TorsHammer, a Python-based DDoS tool created by the group called An0nSec.
  • SYN Flood DOS, a DDoS tool that operates with NMAP and conducts a SYN Flood attack.

MitM Attacks Pick Up Speed – A Russian Coder Launches a New Web Injection Coding Service

In a successful MitM attack, the hacker infiltrates a web session between a bank and a bank customer, intercepts the messages they are exchanging, including credentials and classified information, and injects new messages, all without arousing the suspicion of either party.

In most cases, the injections are tailored to the victim. In other words, the victim sees a website purporting to belong to the specific bank whose site the victim is attempting to access. The injections are delivered via banking Trojans such as Zeus. On closed forums, injections are sold as separate modules for banking malware.

Web injections are sold on a Russian underground forum

Web injections are sold on a Russian underground forum

On one of the leading Russian-language cybercrime forums, we recently discovered a new thread offering web-injection services. The author was selling a large variety of injections for banks and online services in the United States and Canada.

According to the thread, the service includes an administration panel for managing the infected machines and stolen data, the ability to change the victim’s banking account balance (after a money transfer was performed), the ability to grab answers to security questions, and many other features.

The prices are quite affordable and vary from $50 to $150, though it should be noted that anyone wishing to carry out an MitM attack should already possess a botnet of machines infected with banking Trojans. When the victim tries to access his bank account, the attacker intercepts the session and displays a fake webpage that is very similar to the real bank’s site. The victim is asked to fill in login credentials, answer security questions, provide credit card data, and more. The attacker immediately receives the information through the administration panel and can use it to transfer the money, while the victim receives a connection error and simply tries to connect to the bank’s website one more time.

Detecting such an attack can be difficult, since one failed connection to the bank website or minor differences between the design of the fake page and that of the real page do not usually arouse the victim’s suspicions. In addition, as mentioned above, the account balance that the victim sees does not change after the money has been stolen.

The seller has launched a website to promote sales of the injections he coded. The site contains samples of injections for banks in the United States and Canada and for online services such as PayPal and Ebay. The targeted banks are Wells Fargo, HSBC, Citizens Bank, Scotiabank, RBC Bank, and many more. There was a section in the site indicating that European institutions will be targeted in the future.

Example of injection for a bank, published on the dedicated website

 

Intelligence Review of #OpIsrael Cyber Campaign (April 7, 2015)

Starting at the end of last week, hacktivist groups from around the Muslim world tried to attack Israeli websites, particularly those of government institutions, as part of the #OpIsrael cyber campaign. In the past twenty-four hours they stepped up their activity, but we have seen no signs of major attacks. Despite all the publicity prior to the campaign, the hackers’ successes were limited to defacing several hundred private websites and leaking the email addresses of tens of thousands of Israelis, many of them recycled from previous campaigns. Several dozen credit card numbers were also leaked on information-sharing websites, but our examination shows that some were recycled from past leaks.

AnonGhost, which initiated the campaign, was the main actor behind it. However, other groups of hackers, such as Fallaga, MECA (Middle East Cyber Army), Anon.Official.org, and Indonesian and Algerian groups also participated in the attacks. As the campaign progressed, we saw an increasing number of posts and tweets about it (over 3,000), but this is still significantly less than last year, when there were tens of thousands.

As we noted in previous updates, the campaign was conducted primarily on social networks, especially Facebook and Twitter. IRC channels opened for the campaign were barely active, partly because hackers feared spying by “intelligence agents.” On closed forums and Darknet platforms, we saw no activity related to #OpIsrael.

Participants discuss why the campaign is smaller than in 2013

Participants discuss why the campaign is smaller than in 2013

Following is a summary of the main results of the attacks that we have identified so far:

  • Defacing of hundreds of websites. Victims included Meretz (an Israeli political party), various Israeli companies, sub-domains of institutions of higher education, municipalities, Israeli artists, and more.
  • Leaking of tens of thousands of email addresses and personal information of Israelis. A significant portion of the information was recycled from previous campaigns. Databases from third-party websites were also leaked. In addition, two files were leaked and according to the hackers, one had 30,000 email addresses and the other 150,000 records.
  • Publication of details from dozens of credit cards, some of them recycled.

#OpIsrael Campaign – April 7, 2015: Cyber Intelligence Review

Background

This is the third round of the anti-Israel cyber campaign called #OpIsrael. The hacktivists are highly motivated to attack Israel, and they have been gradually building their campaign infrastructures on social media networks. Many have been posting videos with threatening messages in the leadup to April 7. AnonGhost, which is behind the campaign, has announced that it will cooperate with three anti-Israel groups known from previous campaigns: Fallaga, MECA (Middle East Cyber Army), and Anon Official Arabe.

Official announcement from AnonGhost on future cooperation

Official announcement from AnonGhost on future cooperation

Most of the social media discussions about the campaign are taking place in the Middle East, North Africa, Southeast Asia, Western Europe, and the United States (the attackers appear to be using proxy services). In addition, during March 2015 the number of Twitter tweets about the campaign increased by hundreds per day. Nevertheless, it is important to note that during the campaign, there will likely be several thousand or even tens of thousands of tweets a day, as was the case during previous campaigns.

Increase in the number of tweets about #OpIsrael per day in March 2015

Increase in the number of tweets about #OpIsrael per day in March 2015

Prominent Participants

At the time of writing, the number of participants is about 5,000. The most prominent groups in the campaign are from North Africa, the Middle East, and Southeast Asia. Groups of hackers from South America, such as Anonymous Chile and Anon Defense Brasil, and hackers affiliated with Anonymous have also expressed support for the campaign. We have not yet seen evidence of active involvement or public support for the campaign by cyberterrorist groups.

Attack Targets

The attack targets recommended by those participating in the campaign are government websites, financial websites such as the Tel Aviv Stock Exchange’s or the Bank of Israel’s, academic websites, telecom websites, and media websites. These lists are familiar from previous anti-Israel campaigns.

In addition, AnonGhost and Fallaga leaked a list of hundreds of telephone numbers of Israeli officials from an unknown source to point out potential targets for anti-Israel text messages or phishing attacks, such as those that took place during #OpSaveGaza.

Post from AnonGhost threatening to send messages to Israeli telephone numbers

Post from AnonGhost threatening to send messages to Israeli telephone numbers

Attack Tools

The attack tools we have identified so far mostly appear in lists that include links for downloading the tools. Most of these lists are well-known from previous anti-Israel campaigns. However, we identified several unique self-developed tools created specifically for the campaign:

  • AnonGhost DDoS – A DDoS tool developed by AnonGhost, which initiated the campaign.
  • LOIC Fallaga – A DDoS tool developed by Fallaga. This tool was developed for an anti-Israel hacktivist operation that took place on March 20 of this year, but we expect that hacktivists will use it in the #OpIsrael campaign as well.

School Is Now in Session – The Spread of Hacking Tutorials in the Deep and Dark Web

One of the most common posts seen on hacker forums is “Hello, I’m new and I want to be a hacker.” Any aspiring hacker must learn coding, networking, system security, and the like, and increasingly, hacking forums are responding to this demand and providing tutorials for those who wish to learn the basics quickly.

Hacking forums have two main kinds of tutorial sections, one open to any forum member and the other exclusively for VIP members. In this post we will review two case studies from closed forums, one from the onion network and the other from the Deep Web.

Case Studies

The first tutorial, taken from a closed forum in the onion network, is actually four tutorials wrapped together to teach POS (point-of-sale) hacking. It includes a list of essential malware and software for POS hacking. While it starts with a basic overview of POS and of RAM (random-access memory) scraping, it very quickly dives into explanations that require an advanced understanding of hacking.

POS tutorial in the onion network

POS tutorial in the onion network

The second tutorial is a basic PayPal hacking tutorial, taken from a closed forum on the Deep Web and oriented toward noobs (beginners). It is actually more about scamming than hacking. It notes that one way to get user details is to hack vulnerable shopping sites using SQL injections and explains how to check whether the stolen user details are associated with a PayPal account. It also mentions that user details can simply be acquired from posts on the forum.

PayPal tutorial on closed forum

PayPal tutorial on closed forum

What is really interesting is that this practical forum has many tutorial sections and sub-sections (we counted six), which raises an interesting question: Why do hackers share?

Motives

There is no one answer to this question, but we can divide hackers’ motivations into four categories:

  • Self-promotion – One of the differences between regular hackers and good hackers is reputation. The most obvious way for hackers to improve their reputation is of course to perform a good hack, but they can also enhance their reputation by being part of a well-known hacking team or displaying vast knowledge, such as by publishing tutorials. It appears that Red, a junior member of the onion network forum who is not known and has a small number of posts, is increasing his value in the eyes of other forum members and site administrators by publishing tutorials, including the POS tutorial. This improved reputation can give him new privileges, such as access to the forum’s VIP sections. In most cases, tutorials shared for this reason range from beginner to intermediate level and can be understand by almost any beginner.
  • Site promotion – Commerce in hacking forums hiding deep in the Internet works like any other free market: if you have the right goods, people will come and your business will boom, but if your shop does not look successful, customers will stay away. Hacking forums, like other businesses, compete for the attention of their target audience. The PayPal tutorial was published by BigBoss, a site administrator, who was probably seeking publicity for the site. To ensure that there is a large number of tutorials on the site, the administrators publish their own from time to time. These can be very simple (as in this case) or very specialized and technical (such as those offered in closed forum sections).
  • Financial gain – As we noted, these forums are businesses, and like any business, they need to sell products in order to make a profit. They can do this by creating VIP sections with unique content (such as special tutorials) open to paying members only, as opposed to VIP sections based on reputation or Individual members also use the forums for financial gain and sell more concrete items—malware, credit cards, and the like—or more abstract items, like knowledge in the form of tutorials or lessons. In most cases the tutorials are very advanced, with extensive details, so that their creators can charge for them.
A forum member selling his knowledge

A forum member selling his knowledge

  • Knowledge sharing — Sometimes, people share their knowledge without any ulterior motive. This is usually done in a closed section of a forum and only with prime members or a group of friends. In this case, the knowledge shared varies according to the group and can be state-of-the-art or very simple.

Conclusions

In a society based heavily on information, we cannot escape the frequently rehashed concept that “knowledge is power.” As the technology world continues to evolve and the hacker community along with it, the need for “how to” knowledge is growing. Tutorials provide beginners with an effective gateway into the world of hacking and expose advanced users to new methods of operation. For us, the observers, they provide a small glimpse into developing trends, attack methods, methods of assessing hacker knowledge, and much more.

How Hackers Use Social Media Networks to Put Your Organization at Risk

SenseCy’s teams monitor underground and password-protected forums and communities in many languages – Russian, Arabic, Persian, Chinese, Portuguese, English, and more. By gaining access to the Deep Web and Darknet, we identify suspicious activity and new hacker tools and enable our clients to mitigate or eliminate cyber threats.

Hacker communities on social networks continue to evolve. More and more communities are creating Twitter accounts as well as pages and groups in popular social networks such as Facebook and VKontakte (a Russian social network) to share information, tools, and experience.

In the past, hackers came together on social networks to hold operational discussions, share targets, and join forces for DDoS attacks, but less to upload or download hacking tools. Since this is changing, we are now monitoring hacking tools offered for download on Twitter, Facebook, and VKontakte.

Source code published on Twitter

Source code published on Twitter

These hacker communities can be classified into three main categories:

  1. Open public groups and accounts that make common, well-known tools available.

    Open Facebook group of well-known Arab hackers

    Open Facebook group of well-known Arab hackers

  2. Closed, secret groups sharing rare or sector-related tools or programs in a specific language.

    Secret Facebook group from Southeast Asia

    Secret Facebook group from Southeast Asia

  3. Groups sharing or even selling self-developed tools.
    Facebook post in closed Asian hacker group

    Facebook post in closed Asian hacker group

    A prominent example is the self-developed DDoS tool created by hacker group AnonGhost for the #OpIsrael cyber campaign, which is expected to take place on April 7, 2015. This tool uses three flooding methods, TCP, UDP, and HTTP and can operate through a proxy if needed. AnonGhost posted its new tool on its official Facebook page with a link to a tutorial on YouTube, and soon it was widely distributed among hacktivists through social media.

    From AnonGhost's official Facebook Page

    From AnonGhost’s official Facebook Page

    We regularly monitor trends and developments in social networks, since they are becoming the preferred platform for groups of hackers to share and improve attack tools. SenseCy also takes part in these communities, which gives us the edge in preventing attacks in real time. We continue to track new trends and developments to detect cyber threats for our clients.