Today, Talos is publishing a glimpse into the most prevalent threats we’ve observed between Oct 11 and Oct 18. As with previous roundups, this post isn’t meant to be an in-depth analysis. Instead, this post will summarize the threats we’ve observed by highlighting key behavioral characteristics, indicators of compromise, and discussing how our customers are automatically protected from these threats.

As a reminder, the information provided for the following threats in this post is non-exhaustive and current as of the date of publication. Additionally, please keep in mind that IOC searching is only one part of threat hunting. Spotting a single IOC does not necessarily indicate maliciousness. Detection and coverage for the following threats is subject to updates, pending additional threat or vulnerability analysis. For the most current information, please refer to your Firepower Management Center, Snort.org, or ClamAV.net.

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Reference:

TRU10182019 – This is a JSON file that includes the IOCs referenced in this post, as well as all hashes associated with the cluster. The list is limited to 25 hashes in this blog post. As always, please remember that all IOCs contained in this document are indicators, and that one single IOC does not indicate maliciousness. See the Read More link above for more details.

Attackers are capitalizing on the recent discovery of a new vulnerability that exists across legacy iOS hardware. Cisco Talos recently discovered a malicious actor using a fake website that claims to give iPhone users the ability to jailbreak their phones. However, this site just prompts users to download a malicious profile which allows the attacker to conduct click-fraud.

Checkm8 is a vulnerability in the bootrom of some legacy iOS devices that allows users to control the boot process. The vulnerability impacts all legacy models of the iPhone from the 4S through the X. The campaign we’ll cover in this post tries to capitalize off of checkra1n, a project that uses the checkm8 vulnerability to modify the bootrom and load a jailbroken image onto the iPhone. Checkm8 can be exploited with an open-source tool called “ipwndfu” developed by Axi0mX.

The attackers we’re tracking run a malicious website called checkrain[.]com that aims to draw in users who are looking for checkra1n.

This discovery made headlines and caught the attention of many security researchers. Jailbreaking a mobile device can be attractive to researchers, average users and malicious actors. A researcher or user may want to jailbreak phones to bypass standard restrictions put in place by the manufacturer to download additional software onto the device or look deeper into the inner workings of the phone. However, an attacker could jailbreak a device for malicious purposes, eventually obtaining full control of the device.

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Today, Talos is publishing a glimpse into the most prevalent threats we’ve observed between Oct 4 and Oct 11. As with previous roundups, this post isn’t meant to be an in-depth analysis. Instead, this post will summarize the threats we’ve observed by highlighting key behavioral characteristics, indicators of compromise, and discussing how our customers are automatically protected from these threats.

As a reminder, the information provided for the following threats in this post is non-exhaustive and current as of the date of publication. Additionally, please keep in mind that IOC searching is only one part of threat hunting. Spotting a single IOC does not necessarily indicate maliciousness. Detection and coverage for the following threats is subject to updates, pending additional threat or vulnerability analysis. For the most current information, please refer to your Firepower Management Center, Snort.org, or ClamAV.net.

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Reference:

TRU10112019 – This is a JSON file that includes the IOCs referenced in this post, as well as all hashes associated with the cluster. The list is limited to 25 hashes in this blog post. As always, please remember that all IOCs contained in this document are indicators, and that one single IOC does not indicate maliciousness. See the Read More link above for more details.

Cisco Talos has a new plugin available for IDA Pro that provides a new disassembler for TileGX binaries. This tool should assist researchers in reverse-engineering threats in IDA Pro that target TileGX.

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Today, Talos is publishing a glimpse into the most prevalent threats we’ve observed between Sep. 27 to Oct 4. As with previous roundups, this post isn’t meant to be an in-depth analysis. Instead, this post will summarize the threats we’ve observed by highlighting key behavioral characteristics, indicators of compromise, and discussing how our customers are automatically protected from these threats.

As a reminder, the information provided for the following threats in this post is non-exhaustive and current as of the date of publication. Additionally, please keep in mind that IOC searching is only one part of threat hunting. Spotting a single IOC does not necessarily indicate maliciousness. Detection and coverage for the following threats is subject to updates, pending additional threat or vulnerability analysis. For the most current information, please refer to your Firepower Management Center, Snort.org, or ClamAV.net.

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Reference:

TRU10042019 – This is a JSON file that includes the IOCs referenced in this post, as well as all hashes associated with the cluster. The list is limited to 25 hashes in this blog post. As always, please remember that all IOCs contained in this document are indicators, and that one single IOC does not indicate maliciousness. See the Read More link above for more details.

By Warren Mercer and Paul Rascagneres.

Introduction

Cisco Talos recently observed attackers changing the file formats they use in an attempt to thwart common antivirus engines. This can happen across other file formats, but today, we are showing a change of approach for an actor who has deemed antivirus engines perhaps “too good” at detecting macro-based infection vectors.  We’ve noticed that the OpenDocument (ODT) file format for some Office applications can be used to bypass these detections. ODT is a ZIP archive with XML-based files used by Microsoft Office, as well as the comparable Apache OpenOffice and LibreOffice software.

There have recently been multiple malware campaigns using this file type that are able to avoid antivirus detection, due to the fact that these engines view ODT files as standard archives and don’t apply the same rules it normally would for an Office document. We also identified several sandboxes that fail to analyze ODT documents, as it is considered an archive, and the sandbox won’t open the document as a Microsoft Office file. Because of this, an attacker can use ODT files to deliver malware that would normally get blocked by traditional antivirus software.

We only found a few samples where this file format was used. The majority of these campaigns using malicious documents still rely on the Microsoft Office file format, but these cases show that the ODT file format could be used in the future at a more successful rate. In this blog post, we’ll walk through three cases of OpenDocument usage. The two first cases targets Microsoft Office, while the third one targets only OpenOffice and LibreOffice users. We do not know at this time if these samples were used simply for testing or a more malicious context.

Read more at Talosintelligence.com

Today, Talos is publishing a glimpse into the most prevalent threats we’ve observed between Sep. 20 to Sep 27. As with previous roundups, this post isn’t meant to be an in-depth analysis. Instead, this post will summarize the threats we’ve observed by highlighting key behavioral characteristics, indicators of compromise, and discussing how our customers are automatically protected from these threats.

As a reminder, the information provided for the following threats in this post is non-exhaustive and current as of the date of publication. Additionally, please keep in mind that IOC searching is only one part of threat hunting. Spotting a single IOC does not necessarily indicate maliciousness. Detection and coverage for the following threats is subject to updates, pending additional threat or vulnerability analysis. For the most current information, please refer to your Firepower Management Center, Snort.org, or ClamAV.net.

Read More

Reference:

TRU272019 – This is a JSON file that includes the IOCs referenced in this post, as well as all hashes associated with the cluster. The list is limited to 25 hashes in this blog post. As always, please remember that all IOCs contained in this document are indicators, and that one single IOC does not indicate maliciousness. See the Read More link above for more details.

Executive summary

Cisco Talos recently discovered a new malware loader being used to deliver and infect systems with a previously undocumented malware payload called “Divergent.” We first dove into this malware after we saw compelling data from Cisco Advanced Malware Protection’s (AMP) Exploit Prevention.

This threat uses NodeJS — a program that executes JavaScript outside of a web browser — as well as the legitimate open-source utility WinDivert to facilitate some of the functionality in the Divergent malware. The use of NodeJS is not something commonly seen across malware families.

The observed malware campaigns associated with Divergent feature the use of persistence techniques most commonly associated with “fileless” malware, leaving behind few artifacts for researchers to look at. This malware can be leveraged by an attacker to target corporate networks and appears to be primarily designed to conduct click fraud. It also features several characteristics that have been observed in other click-fraud malware, such as Kovter.

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Cisco Talos recently discovered a threat actor attempting to take advantage of Americans who may be seeking a job, especially military veterans. The actor, previously identified by Symantec as Tortoiseshell, deployed a website called hxxp://hiremilitaryheroes[.]com that posed as a website to help U.S. military veterans find jobs. The URL is strikingly close to the legitimate service from the U.S. Chamber of Commerce, https://www.hiringourheroes.org. The site prompted users to download an app, which was actually a malware downloader, deploying malicious spying tools and other malware.

This is just the latest actions by Tortoiseshell. Previous research showed that the actor was behind an attacker on an IT provider in Saudi Arabia. For this campaign Talos tracked, Tortoiseshell used the same backdoor that it has in the past, showing that they are relying on some of the same tactics, techniques and procedures (TTPs).

Read more at Talosintelligence.com