Cisco Blogs

Threat Research

  • Threat Roundup for June 22-29


    June 29, 2018 - 0 Comments

    Today, Talos is publishing a glimpse into the most prevalent threats we’ve observed between June 22 and June 29. As with previous round-ups, 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. 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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  • Vulnerability Spotlight: VMWare Workstation DoS Vulnerability


    June 29, 2018 - 0 Comments

    Today, Talos is disclosing a vulnerability in VMWare Workstation that could result in Denial of Service.  VMWare Workstation is a widely used virtualization platform designed to run alongside a normal operating system, allowing users to use both virtualized and physical systems concurrently.

    TALOS-2018-0540

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  • Files Cannot Be Decrypted? Challenge Accepted. Talos Releases ThanatosDecryptor


    June 26, 2018 - 0 Comments

    This blog post was authored by Edmund Brumaghin, Earl Carter and Andrew Williams.

    Executive summary

    Cisco Talos has analyzed Thanatos, a ransomware variant that is being distributed via multiple malware campaigns that have been conducted over the past few months. As a result of our research, we have released a new, free decryption tool to help victims recover from this malware. Multiple versions of Thanatos have been leveraged by attackers, indicating that this is an evolving threat that continues to be actively developed by threat actors with multiple versions having been distributed in the wild. Unlike other ransomware commonly being distributed, Thanatos does not demand ransom payments to be made using a single cryptocurrency like bitcoin. Instead, it has been observed supporting ransom payments in the form of Bitcoin Cash (BCH), Zcash (ZEC), Ethereum (ETH) and others.

    Additionally, due to issues present within the encryption process leveraged by this ransomware, the malware authors are unable to return the data to the victim, even if he or she pays the ransom. While previous reports seem to indicate this is accidental, specific campaigns appear to demonstrate that in some cases, this is intentional on the part of the distributor. In response to this threat, Talos is releasing ThanatosDecryptor, a free decryption tool that exploits weaknesses in the design of the file encryption methodology used by Thanatos. This utility can be used by victims to regain access to their data if infected by this ransomware.

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  • Threat Roundup for June 16-22


    June 22, 2018 - 0 Comments

    Today, Talos is publishing a glimpse into the most prevalent threats we’ve observed between June 1 and June 15. As with previous round-ups, 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. 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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  • My Little FormBook


    June 20, 2018 - 1 Comment

    Cisco Talos has been tracking a new campaign involving the FormBook malware since May 2018 that utilizes four different malicious documents in a single phishing email. FormBook is an inexpensive stealer available as “malware as a service.” This means an attacker can purchase a compiled piece of malware based on their desired parameters. This is commonplace with crimeware and stealer type malware such as FormBook. It is able to record keystrokes, steal passwords (stored locally and in web forms) and can take screenshots.

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  • Vulnerability Spotlight: Multiple Remote Vulnerabilities In Insteon Hub PubNub


    June 19, 2018 - 0 Comments

    Cisco Talos is disclosing twelve new vulnerabilities in Insteon Hub, ranging from remote code execution, to denial of service. The majority of the vulnerabilities have their root cause in the unsafe usage of the strcpy() function, leading either to stack overflow or global overflow.

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  • Threat Roundup for June 1-15


    June 15, 2018 - 0 Comments

    Today, Talos is publishing a glimpse into the most prevalent threats we’ve observed between June 1 and June 15. As with previous round-ups, 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. 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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  • Vulnerability Spotlight: TALOS-2018-0523-24 – Multiple Vulnerabilities in Pixars Renderman application


    June 14, 2018 - 0 Comments

    Talos is disclosing two denial-of-ervice vulnerabilities in Pixar’s Renderman application. Renderman is a rendering application used in animation and film production. It is widely used for advanced rendering and shading in many large-scale environments. Both vulnerabilities are due to the lack of proper validation during the parsing process of network packets.

    Pixar remedied these vulnerabilities in RenderMan version 21.7

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  • Vulnerability Spotlight: TALOS-2018-0545 – Microsoft wimgapi LoadIntegrityInfo Code Execution Vulnerability


    June 13, 2018 - 0 Comments

    Talos is disclosing a remote code execution vulnerability in the Microsoft wimgapi library. The wimgapi DLL is used in the Microsoft Windows operating system to perform operations on Windows Imaging Format (WIM) files. WIM is a file-based disk image format created by Microsoft to simplify the deployment of Windows systems. If an attacker creates a specially crafted WIM file, they could be able to execute malicious code with the same access rights as the logged-in user, or just crash the system with a denial-of-service attack. The vulnerability is related to the file header parsing, which means it gets triggered even on simple operations. WIM files do not have a registered file type handler by default, which means that this vulnerability cannot be triggered by tricking a user into double-clicking a WIM file — at least not without registering a file-handler first.

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  • Microsoft Patch Tuesday – June 2018


    June 12, 2018 - 0 Comments

    Executive Summary

    Microsoft has released its monthly set of security advisories for vulnerabilities that have been identified and addressed in various products. This month’s advisory release addresses 50 flaws, with 11 of them rated “critical,” and 39 rated “important.” These vulnerabilities impact Microsoft Edge, Internet Explorer, Chakra Scripting Engine, Windows DNSAPI, Microsoft Office, Windows Kernel and more.

    In addition to the 50 vulnerabilities referenced above, Microsoft has also released a critical update advisory, ADV180014, the June 2018 Adobe Flash Security Update, which addresses the vulnerabilities described in the security bulletin.

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