Booby-trapped Word documents in the wild exploit critical Microsoft 0day

April 8, 2017 – 5:03 PM

There’s a new zeroday attack in the wild that’s surreptitiously installing malware on fully-patched computers. It does so by exploiting a vulnerability in most or all versions of Microsoft Word.

The attack starts with an e-mail that attaches a malicious Word document, according to a blog post published Saturday by researchers from security firm FireEye. Once opened, exploit code concealed inside the document connects to an attacker-controlled server. It downloads a malicious HTML application file that’s disguised to look like a document created in Microsoft’s Rich Text Format. Behind the scenes, the .hta file downloads additional payloads from “different well-known malware families.”

The attack is notable for several reasons. First, it bypasses most exploit mitigations: This capability allows it to work even against Windows 10, which security experts widely agree is Microsoft’s most secure operating system to date. Second, unlike the vast majority of the Word exploits seen in the wild over the past few years, this new attack doesn’t require targets to enable macros. Last, before terminating, the exploit opens a decoy Word document in an attempt to hide any sign of the attack that just happened.

The zeroday attacks were first reported Friday evening by researchers from security firm McAfee.

Source:
https://arstechnica.com/security/2017/04/booby-trapped-word-documents-in-the-wild-exploit-critical-microsoft-0day/

Fake Font Update on Google Chrome Uses Social Engineering to Infect Users with Ransomware

February 24, 2017 – 8:57 PM

We’ve seen social engineering attacks manipulate users time and time again. From phishing emails, to baiting attempts – this breed of cyberthreat has continued to manipulate users for years. And now a new scam has emerged that utilizes a fake update on Google Chrome to trick users into downloading and infecting themselves with the infamous Spora ransomware.

The trick is simple. First, the attackers insert JavaScript into poorly secured, but legitimate websites to modify the text rendering on them. Then, when victims visit these sites, the script makes the website indecipherable and prompts them to fix the issue by updating their “Chrome font pack.” Essentially, a window pops up, showing, “The ‘HoeflerText’ font wasn’t found,” and users are asked to update the Chrome Font Pack. And if they click, they’re immediately infected with the highly-effective Spora ransomware, instead of an update for their browser.

So why is this attack seeing such easy success? Believe it not, Hoefler Text is, in fact, a real font, adding a sense of legitimacy behind the scam. However, the malware has primarily seen so much success due to its ability to fly under the radar, as it does not get flagged as an infection by a variety of security programs.

What’s worse is that this isn’t the first time this has happened – delivery of malware through the EITest redirect gates has been around since at least 2014. Additionally, the infected sites and samples change all the time and simply blocking URLs, domains, and IP’s at the perimeter would just be playing “whack-a-mole.”

In fact, EITest gates are typically used in combination with the RIG, Angler, and Sundown EK’s to redirect victims to quite a few ransomware strains, including Spora, CryptoShield, CryptoMix, and Cerber, as well as banking Trojans and various other malware types.

Source:
https://securingtomorrow.mcafee.com/business/fake-font-update-google-chrome-uses-social-engineering-infect-users-ransomware/

Announcing the first SHA1 collision

February 24, 2017 – 5:49 AM

Cryptographic hash functions like SHA-1 are a cryptographer’s swiss army knife. You’ll find that hashes play a role in browser security, managing code repositories, or even just detecting duplicate files in storage. Hash functions compress large amounts of data into a small message digest. As a cryptographic requirement for wide-spread use, finding two messages that lead to the same digest should be computationally infeasible. Over time however, this requirement can fail due to attacks on the mathematical underpinnings of hash functions or to increases in computational power.

Today, more than 20 years after of SHA-1 was first introduced, we are announcing the first practical technique for generating a collision. This represents the culmination of two years of research that sprung from a collaboration between the CWI Institute in Amsterdam and Google. We’ve summarized how we went about generating a collision below. As a proof of the attack, we are releasing two PDFs that have identical SHA-1 hashes but different content.

For the tech community, our findings emphasize the necessity of sunsetting SHA-1 usage. Google has advocated the deprecation of SHA-1 for many years, particularly when it comes to signing TLS certificates. As early as 2014, the Chrome team announced that they would gradually phase out using SHA-1. We hope our practical attack on SHA-1 will cement that the protocol should no longer be considered secure.

We hope that our practical attack against SHA-1 will finally convince the industry that it is urgent to move to safer alternatives such as SHA-256.

Source:
https://security.googleblog.com/2017/02/announcing-first-sha1-collision.html

New ASLR-busting JavaScript is about to make drive-by exploits much nastier

February 18, 2017 – 7:01 AM

For a decade, every major operating system has relied on a technique known as address space layout randomization to provide a first line of defense against malware attacks. By randomizing the computer memory locations where application code and data are loaded, ASLR makes it hard for attackers to execute malicious payloads when exploiting buffer overflows and similar vulnerabilities. As a result, exploits cause a simple crash rather than a potentially catastrophic system compromise.

Now, researchers have devised an attack that could spell the end of ASLR as the world knows it now. The attack uses simple JavaScript code to identify the memory addresses where system and application components are loaded. When combined with attack code that exploits vulnerabilities in browsers or operating systems, the JavaScript can reliably eliminate virtually all of the protection ASLR provides. The technique, which exploits what’s known as a side channel in the memory cache of all widely used modern CPUs, is described in a research paper published on Wednesday. The researchers have dubbed the technique ASLR Cache or AnC for short.
“Fundamentally insecure”

The researchers said the side channel attack is much more damaging than previous ASLR bypasses, because it exploits a micro-architectural property of the CPU’s that’s independent of any operating system or application running on it. Whereas heap spraying and other forms of ASLR bypass can often be mitigated by software tweaks, there isn’t much that can stop or lessen the effects of the JavaScript, which targets a CPU’s MMU, or memory management unit. That’s because CPU caching behavior and strong address space randomization are mutually exclusive. (Apple, however, recently hardened its Safari browser to partially mitigate such attacks. It’s also possible to prevent JavaScript from running in a browser, but such blocking often severely degrades a site’s usability.)

Source:
https://arstechnica.com/security/2017/02/new-aslr-busting-javascript-is-about-to-make-drive-by-exploits-much-nastier/

This ‘invisible’ memory-based malware is infiltrating organisations across the globe

February 9, 2017 – 4:53 AM

Cybercriminals are launching ‘invisible’ attacks to infiltrate the networks of organisations to steal login credentials and financial data — and the only tool they’re using is legitimate software.

It’s thought that over 140 organisations including banks, telecommunications companies, and government organisations across the globe have fallen victim to these hidden malware attacks.

Discovered by cybersecurity researchers at Kaspersky Lab, the attacks use widely-available tools, including penetration-testing and administration software as well as the PowerShell framework for task automation in Windows, to hide malware in victims’ computer memory, instead of the more traditional tactic of dropping it onto the hard drive.

This form of attack leaves investigators with almost no evidence that an attack took place, and any indication of an incident is removed when the system is rebooted.

The discovery came after Kaspersky Lab was contacted by banks which had found Meterpreter penetration-testing software in the memory of their servers when it wasn’t supposed to be in that location.

Meterpreter had its code combined with legitimate PowerShell scripts and other utilities, with the aim of stealing administrator passwords and remotely controlling machines and systems. All of these factors indicate the attackers are attempting to make off with credentials about financial processes.

This ‘invisible’ method of attack makes it difficult to uncover details about incidents because a lack of traces of hacker activity mean the normal processes of incident response don’t apply.

Source:
http://www.zdnet.com/article/this-invisible-memory-based-malware-is-infiltrating-organisations-across-the-globe/

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