BlackMatter ransomware group announces shutdown. But for how long?

The BlackMatter ransomware gang has announced they are going to shut down their operation, citing pressure from local authorities. And pressure there is. Only two weeks ago, we wrote about a warning that the Federal Bureau of Investigation FBI, the Cybersecurity and Infrastructure Security Agency...

CVE-2021-3455

Disconnecting L2CAP channel right after invalid ATT request leads freeze. Zephyr versions = 2.4.0, = 2.5.0 contain Use After Free CWE-416. For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7g38-3x9v-v7vp...

Design/Logic Flaw

Disconnecting L2CAP channel right after invalid ATT request leads freeze. Zephyr versions = 2.4.0, = 2.5.0 contain Use After Free CWE-416. For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7g38-3x9v-v7vp...

CVE-2021-3455 Disconnecting L2CAP channel right after invalid ATT request leads freeze

Disconnecting L2CAP channel right after invalid ATT request leads freeze. Zephyr versions = 2.4.0, = 2.5.0 contain Use After Free CWE-416. For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7g38-3x9v-v7vp...

Protect yourself from BlackMatter ransomware: Advice issued

Despite promises made by the BlackMatter ransomware gang about which organizations and business types they would avoid, multiple US critical infrastructure entities have been targeted. Now, the Federal Bureau of Investigation FBI, in conjunction with the Cybersecurity and Infrastructure Security...

Zephyr 资源管理错误漏洞

Zephyr is an open source, small, scalable, real-time operating system. Zephyr 2.4.0 and later, 2.5.0 and later are vulnerable to a resource management error that stems from disconnecting the L2CAP channel immediately after an invalid ATT request causes a freeze. No detailed vulnerability details...

BlackMatter Ransomware

Summary Actions You Can Take Now to Protect Against BlackMatter Ransomware • Implement and enforce backup and restoration policies and procedures. • Usestrong, unique passwords. • Usemulti-factor authentication. • Implement network segmentation and traversal monitoring. Note: this advisory uses t...

Tenacity 2.0 – Emulating Threat groups

Introduction The previous article: Tenacity – An Adversary Emulation Tool for Persistence, walked us through the working of Tenacity, techniques it supports, and how it can help organizations and individuals to validate the risk posture. As with the second installment of the series, this post wil...

What's New in InsightIDR: Q3 2021 in Review

This post offers a closer look at some of the recent updates and releases in InsightIDR, our extended detection and response solution, from Q3 2021. Welcome IntSights to the Rapid7 Insight Platform family! As you may have seen in recent communications, Rapid7 acquired IntSights, a leading provide...

The Ransomware Killchain: How It Works, and How to Protect Your Systems

Much ado has been made by this very author on this very blog! about the incentives for attackers and defenders around ransomware. There is also a wealth of information on the internet about how to protect yourself from ransomware. One thing we want to avoid losing sight of, however, is just how w...

Operation ‘Harvest’: A Deep Dive into a Long-term Campaign

ARCHIVED STORY Operation ‘Harvest’: A Deep Dive into a Long-term Campaign By Christiaan Beek · September 14, 2021 A special thanks to our Professional Services’ IR team, ShadowServer, for historical context on C2 domains, and Thomas Roccia/Leandro Velasco for malware analysis support. Executive...

Operation ‘Harvest’: A Deep Dive into a Long-term Campaign

ARCHIVED STORY Operation ‘Harvest’: A Deep Dive into a Long-term Campaign By Christiaan Beek · September 14, 2021 A special thanks to our Professional Services’ IR team,ShadowServer, for historical context on C2 domains, and Thomas Roccia/Leandro Velasco for malware analysis support. Executive...

Holy Grail of Security: Answer to ‘Did X Work?’ – Podcast

Get a glass. Pour in one shot of VERIS, aka the Vocabulary for Event Recording and Incident Sharing engine that generates Verizon’s funny, well-written, incredibly useful, annual Database Investigations Report DBIR. Next, add a shot of MITRE ATT&CK: the curated knowledge repository of reported...

AT&T Labs Xmill 缓冲区错误漏洞

AT&T Labs Xmill is a new tool for efficiently compressing XML data from AT&T Labs, USA. A security vulnerability exists in AT&T Labs Xmill due to a boundary error in the xml parsing ParseAttribs function. A remote attacker could exploit the vulnerability could send a specially crafted XML file,...

AT&T Labs Xmill 缓冲区错误漏洞

AT&T Labs Xmill is a new tool for efficiently compressing XML data from AT&T Labs, USA. A buffer error vulnerability exists in AT&T Labs Xmill due to a boundary error in the command line parsing HandleFileArg function in memcpy. A local user can use a specially crafted command line argument to...

AT&T Labs Xmill 数字错误漏洞

AT&T Labs Xmill is a new tool for efficiently compressing XML data from AT&T Labs. A numeric error vulnerability exists in AT&T Labs Xmill that stems from a memory corruption vulnerability in the parsing CreateLabelOrAttrib function. A specially crafted XML file could result in a heap buffer...

Optimize Your Incident Response Planning with the MITRE Framework

Threat research experts discuss the evolving landscape and how the MITRE ATT framework can help optimize incident response across your organization...

AT&T Labs Xmill 缓冲区错误漏洞

AT&T Labs Xmill is a new tool for efficiently compressing XML data from AT&T Labs, USA. A security vulnerability exists in the XML Decompression PlainTextUncompressor::UncompressItem function in AT&T Labs Xmill version 0.7. An attacker could exploit the vulnerability to remotely execute code...

Tenacity – An Adversary Emulation Tool for Persistence

Persistence is one of the more sought-after techniques of an attacker or adversary. Persistence is achieved through a set of tactics or techniques that adversaries use to maintain their foothold on compromised systems across restarts, changed credentials, and other interruptions that could cut of...

Dorothy - Tool To Test Security Monitoring And Detection For Okta Environments

Created by David French @threatpunter at Elastic Security Dorothy is a tool to help security teams test their monitoring and detection capabilities for their Okta environment. Dorothy has several modules to simulate actions that an attacker might take while operating in an Okta environment and...