FireEye Blog

Threat Research, Analysis, and Mitigation

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Election Cyber Threats in the Asia-Pacific Region In democratic societies, elections are the mechanism for choosing heads of state and policymakers. There are strong incentives for adversary nations to understand the intentions and preferences of the people and parties that will shape a country's future path and to reduce uncertainty about likely winners. Mandiant Threat Intelligence regularly observes cyber espionage operations we believe to be seeking election-related information targeting governments, civil society, media, and technology organizations around the globe. We have also seen disruptive and destructive cyber atta...
Purgalicious VBA: Macro Obfuscation With VBA Purging
WOW64!Hooks: WOW64 Subsystem Internals and Hooking Techniques Microsoft is known for their backwards compatibility. When they rolled out the 64-bit variant of Windows years ago they needed to provide compatibility with existing 32-bit applications. In order to provide seamless execution regardless of application bitness, the WoW (Windows on Windows) system was coined. This layer, which will be referred to as ‘WOW64’ from here on out, is responsible for translating all Windows API calls from 32-bit userspace to the 64-bit operating system kernel. This blog post is broken up into two sections. First we start by diving deep into the WOW64 ...
Unhappy Hour Special: KEGTAP and SINGLEMALT With a Ransomware Chaser Throughout 2020, ransomware activity has become increasingly prolific, relying on an ecosystem of distinct but co-enabling operations to gain access to targets of interest before conducting extortion. Mandiant Threat Intelligence has tracked several loader and backdoor campaigns that lead to the post-compromise deployment of ransomware, sometimes within 24 hours of initial compromise. Effective and fast detection of these campaigns is key to mitigating this threat. The malware families enabling these attacks previously reported by Mandiant to intelligence subscribers inc...
Live off the Land? How About Bringing Your Own Island? An Overview of UNC1945 Through Mandiant investigation of intrusions, the FLARE Advanced Practices team observed a group we track as UNC1945 compromise managed service providers and operate against a tailored set of targets within the financial and professional consulting industries by leveraging access to third-party networks (see this blog post for an in-depth description of “UNC” groups). UNC1945 targeted Oracle Solaris operating systems, utilized several tools and utilities against Windows and Linux operating systems, loaded and operated custom virtual machines, and employed techniques to evade...
In Wild Critical Buffer Overflow Vulnerability in Solaris Can Allow Remote Takeover — CVE-2020-14871 FireEye Mandiant has been investigating compromised Oracle Solaris machines in customer environments. During our investigations, we discovered an exploit tool on a customer’s system and analyzed it to see how it was attacking their Solaris environment. The FLARE team’s Offensive Task Force analyzed the exploit to determine how it worked, reproduced the vulnerability on different versions of Solaris, and then reported it to Oracle. In this blog post we present a description of the vulnerability, offer a quick way to test whether a system may be vulnerable, and suggest mitigati...
Ransomware Protection and Containment Strategies: Practical Guidance for Endpoint Protection, Hardening, and Containment UPDATE (Oct. 30, 2020): We have updated the report to include additional protection and containment strategies based on front-line visibility and response efforts in combating ransomware. While the full scope of recommendations included within the initial report remain unchanged, the following strategies have been added into the report: Windows Firewall rule configurations to block specific binaries from establishing outbound connections from endpoints Domain Controller isolation and recovery planning steps Proactive GPO permissions review and monitoring...
Welcome to ThreatPursuit VM: A Threat Intelligence and Hunting Virtual Machine Skilled adversaries can deceive detection and often employ new measures in their tradecraft. Keeping a stringent focus on the lifecycle and evolution of adversaries allows analysts to devise new detection mechanisms and response processes. Access to the appropriate tooling and resources is critical to discover these threats within a timely and accurate manner. Therefore, we are actively compiling the most essential software packages into a Windows-based distribution: ThreatPursuit VM. ThreatPursuit Virtual Machine (VM) is a fully customizable, open-sourced Windows-based distri...
Flare-On 7 Challenge Solutions We are thrilled to announce the conclusion of the seventh annual Flare-On challenge. This year proved to be the most difficult challenge we’ve produced, with the lowest rate of finishers. This year’s winners are truly the elite of the elite! Lucky for them, all 260 winners will receive this cyberpunk metal key. We would like to thank the challenge authors individually for their great puzzles and solutions: fidler – Nick Harbour (@nickharbour) garbage – Jon Erickson Wednesday – Blaine Stancill (@MalwareMechanic) report – Moritz Raabe (@m_r_tz) TKApp – Moritz ...
FIN11: Widespread Email Campaigns as Precursor for Ransomware and Data Theft Mandiant Threat Intelligence recently promoted a threat cluster to a named FIN (or financially motivated) threat group for the first time since 2017. We have detailed FIN11's various tactics, techniques and procedures in a report that is available now by signing up for Mandiant Advantage Free. In some ways, FIN11 is reminiscent of APT1; they are notable not for their sophistication, but for their sheer volume of activity. There are significant gaps in FIN11’s phishing operations, but when active, the group conducts up to five high-volume campaigns a week. While many finan...