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WinRAR Zero-day Abused in Multiple Campaigns

WinRAR, an over 20-year-old file archival utility used by over 500 million users worldwide, recently acknowledged a long-standing vulnerability in its code-base. A recently published path traversal zero-day vulnerability, disclosed in CVE-2018-20250 by Check Point Research, enables attackers to specify arbitrary destinations during file extraction of ‘ACE’ formatted files, regardless of user input. Attackers can easily achieve persistence and code execution by creating malicious archives that extract files to sensitive locations, like the Windows “Startup” Start Menu folder. While this vulnerability has […]

SilkETW: Because Free Telemetry is…Free!

In the following example, we will collect process event data from the Kernel provider and use image loads to identify Mimikatz execution. We can collect the required data with this command: SilkETW.exe -t kernel -kk ImageLoad -ot file -p C:Usersb33fDesktopmimikatz.json With data in hand it is easy to sort, grep and filter for the properties […]

Breaking the Bank: Weakness in Financial AI Applications

Currently, threat actors possess limited access to the technology required to conduct disruptive operations against financial artificial intelligence (AI) systems and the risk of this targeting type remains low. However, there is a high risk of threat actors leveraging AI as part of disinformation campaigns to cause financial panic. As AI financial tools become more […]

APT40: Examining a China-Nexus Espionage Actor

FireEye is highlighting a cyber espionage operation targeting crucial technologies and traditional intelligence targets from a China-nexus state sponsored actor we call APT40. The actor has conducted operations since at least 2013 in support of China’s naval modernization effort. The group has specifically targeted engineering, transportation, and the defense industry, especially where these sectors overlap […]

FLARE Script Series: Recovering Stackstrings Using Emulation with ironstrings

This blog post continues our Script Series where the FireEye Labs Advanced Reverse Engineering (FLARE) team shares tools to aid the malware analysis community. Today, we release ironstrings: a new IDAPython script to recover stackstrings from malware. The script leverages code emulation to overcome this common string obfuscation technique. More precisely, it makes use of our flare-emu tool, […]

Bypassing Network Restrictions Through RDP Tunneling

Remote Desktop Services is a component of Microsoft Windows that is used by various companies for the convenience it offers systems administrators, engineers and remote employees. On the other hand, Remote Desktop Services, and specifically the Remote Desktop Protocol (RDP), offers this same convenience to remote threat actors during targeted system compromises. When sophisticated threat […]