Author Archives: Talos Group

Threat Roundup for May 22 to May 29

Today, Talos is publishing a glimpse into the most prevalent threats we’ve observed between May 22 and May 29. 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

20200529-tru.json – 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.

The post Threat Roundup for May 22 to May 29 appeared first on Cisco Blogs.

Dynamic Data Resolver (DDR) — IDA Plugin 1.0 beta

Executive summary

Static reverse-engineering in IDA can often be problematic. Certain values are calculated at run time, which makes it difficult to understand what a certain basic block is doing. If you try to perform dynamic analysis by debugging a piece of malware, the malware will often detect it and start behaving differently. Today, Cisco Talos is releasing the 1.0 beta version of Dynamic Data Resolver (DDR) — a plugin for IDA that makes reverse-engineering malware easier. DDR is using instrumentation techniques to resolve dynamic values at runtime from the sample. For the 1.0 release, we have fixed a couple of bugs, ported it to the latest IDA version, added multiple new features, plus a new installer script that automatically resolves all dependencies.

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Vulnerability Spotlight: Memory Corruption Vulnerability in GNU Glibc Leaves Smart Vehicles Open to Attack

By Sam Dytrych and Jason Royes.

Executive summary

Modern automobiles are complex machines, merging both mechanical and computer systems under one roof. As automobiles become more advanced, additional sensors and devices are added to help the vehicle understand its internal and external environments. These sensors provide drivers with real-time information, connect the vehicle to the global fleet network and, in some cases, actively use and interpret this telemetry data to drive the vehicle.

 These vehicles also frequently integrate both mobile and cloud components to improve the end-user experience. Functionality such as vehicle monitoring, remote start/stop, over-the-air-updates and roadside assistance are offered to the end-user as additional services and quality of life improvements.

 All these electronic and computer systems introduce a lot of different attack vectors in connected vehicles – Bluetooth, Digital Radio (HD Radio/DAB), USB, CAN bus, Wi-Fi and, in some cases, cellular. However, like any other embedded system, connected vehicles are exposed to cyber attacks and security threats. Some of the threats that connected vehicles face include software vulnerabilities, hardware-based attacks and even remote control of the vehicle. During some recent research, Cisco’s Customer Experience Assessment & Penetration Team (CX APT) discovered a memory corruption vulnerability in GNU libc for ARMv7, which leaves Linux ARMv7 systems open to exploitation. This vulnerability is identified as TALOS-2020-1019/CVE-2020-6096.

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The post Vulnerability Spotlight: Memory Corruption Vulnerability in GNU Glibc Leaves Smart Vehicles Open to Attack appeared first on Cisco Blogs.

The Wolf Is Back…

Cisco Talos has discovered a new Android malware based on a leak of the DenDroid malware family. We named this malware “WolfRAT” due to strong links between this malware (and the command and control (C2) infrastructure) and Wolf Research, an infamous organization that developed interception and espionage-based malware and was publicly described by CSIS during VirusBulletin 2018. We identified infrastructure overlaps and string references to previous Wolf Research work. The organization appears to be shut down, but the threat actors are still very active.We identified campaigns targeting Thai users and their devices. Some of the C2 servers are located in Thailand. The panels also contain Thai JavaScript comments and the domain names also contain references to Thai food, a tactic commonly employed to entice users to click/visit these C2 panels without much disruption.

We identified a notable lack of sophistication in this investigation such as copy/paste, unstable code, dead code and panels that are freely open.

Read more >>>

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Threat Roundup for May 8 to May 15

Today, Talos is publishing a glimpse into the most prevalent threats we’ve observed between May 8 and May 15. 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

20200515-tru.json – 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.

The post Threat Roundup for May 8 to May 15 appeared first on Cisco Blogs.

Threat Spotlight: Astaroth – Maze of Obfuscation and Evasion Reveals Dark Stealer

By Nick Biasini, Edmund Brumaghin and Nick Lister.

Executive summary

The threat landscape is littered with various malware families being delivered in a constant wave to enterprises and individuals alike. The majority of these threats have one thing in common: money. Many of these threats generate revenue for financially motivated adversaries by granting access to data stored on end systems that can be monetized in various ways. To maximize profits, some malware authors and/or malware distributors go to extreme lengths to evade detection, specifically to avoid automated analysis environments and malware analysts that may be debugging them. The Astaroth campaigns we are detailing today are a textbook example of these sorts of evasion techniques in practice.

The threat actors behind these campaigns were so concerned with evasion they didn’t include just one or two anti-analysis checks, but dozens of checks, including those rarely seen in most commodity malware. This type of campaign highlights the level of sophistication that some financially motivated actors have achieved in the past few years. This campaign exclusively targeted Brazil, and featured lures designed specifically to tailor to Brazilian citizens, including COVID-19 and Cadastro de Pessoas Físicas status. Beyond that, the dropper used sophisticated techniques and many layers of obfuscation and evasion before even delivering the final malicious payload. There’s another series of checks once the payload is delivered to ensure, with reasonable certainty, that the payload was only executed on systems located in Brazil and not that of a researcher or some other piece of security technology, most notably sandboxes. Beyond that, this malware uses novel techniques for command and control updates via YouTube, and a plethora of other techniques and methods, both new and old.

This blog will provide our deep analysis of the Astaroth malware family and detail a series of campaigns we’ve observed over the past nine to 12 months. This will include a detailed walkthrough of deobfuscating the attack from the initial spam message, to the dropper mechanisms, and finally to all the evasion techniques astaroth has implemented. The goal is to give researchers the tools and knowledge to be able to analyze this in their own environments. This malware is as elusive as it gets and will likely continue to be a headache for both users and defenders for the foreseeable future. This will be especially true if its targeting moves outside of South America and Brazil.

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The post Threat Spotlight: Astaroth – Maze of Obfuscation and Evasion Reveals Dark Stealer appeared first on Cisco Blogs.

Threat Roundup for May 1 to May 8

Today, Talos is publishing a glimpse into the most prevalent threats we’ve observed between Apr 24 and May 1. 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

20200508-tru.json – 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.

The post Threat Roundup for May 1 to May 8 appeared first on Cisco Blogs.