Bot or not? The fake CAPTCHA trick spreading Lumma malware.

Today we are joined by Crystal Morin, Cybersecurity Strategist from Sysdig, as she is sharing their work on "UNC5174’s evolution in China’s ongoing cyber warfare: From SNOWLIGHT to VShell." UNC5174, a Chinese state-sponsored threat actor, has resurfaced with a stealthy cyber campaign using a new arsenal of customized and open-source tools, including a variant of their SNOWLIGHT malware and the VShell RAT. Sysdig researchers discovered that the group targets Linux systems through malicious bash scripts, domain squatting, and in-memory payloads, indicating a high level of sophistication and espionage intent. Their evolving tactics, such as using spoofed domains and fileless malware, continue to blur attribution and pose a significant threat to research institutions, critical infrastructure, and NGOs across the West and Asia-Pacific regions. The research can be found here: UNC5174’s evolution in China’s ongoing cyber warfare: From SNOWLIGHT to VShell Learn more about your ad choices. Visit megaphone.fm/adchoices

This week, we are joined by Nick Cerne, Security Consultant from Bishop Fox, to discuss "Rust for Malware Development." In pursuit of simulating real adversarial tactics, this blog explores the use of Rust for malware development, contrasting it with C in terms of binary complexity, detection evasion, and reverse engineering challenges. The author demonstrates how Rust's inherent anti-analysis traits and memory safety features can create more evasive malware tooling, including a simple dropper that injects shellcode using lesser-known Windows APIs. Through hands-on comparisons and decompiled output analysis, the post highlights Rust’s growing appeal in offensive security while noting key OPSEC considerations and tooling limitations. The research can be found here: Rust for Malware Development Learn more about your ad choices. Visit megaphone.fm/adchoices

This week, we are sharing an episode of our monthly show, Only Malware in the Building. We invite you to join Dave Bittner and cohost Selena Larson as they explore "The new malware on the block." Welcome in! You’ve entered, Only Malware in the Building. Join us each month to sip tea and solve mysteries about today’s most interesting threats. Your host is Selena Larson, Proofpoint intelligence analyst and host of their podcast DISCARDED. Inspired by the residents of a building in New York’s exclusive upper west side, Selena is joined by N2K Networks Dave Bittner —and our newest totally unbiased co-host, Archy, a highly sophisticated AI robot who swears they have no ulterior motives (but we’re keeping an eye on them just in case). Being a security researcher is a bit like being a detective: you gather clues, analyze the evidence, and consult the experts to solve the cyber puzzle. On this episode, we talk about the latest shake-ups in the fake update threat landscape, including two new cybercriminal actors, fresh Mac malware, and the growing challenge of tracking these evolving campaigns. Learn more about your ad choices. Visit megaphone.fm/adchoices

Zach Edwards from Silent Push is discussing their work on "New Lazarus Group Infrastructure, Acquires Sensitive Intel Related to $1.4B ByBit Hack and Past Attacks." Silent Push analysts uncovered significant infrastructure used by the Lazarus APT Group, linking them to the $1.4 billion Bybit crypto heist through the domain bybit-assessment[.]com registered just hours before the attack. The investigation revealed a pattern of test entries, VPN usage, and fake job interview scams targeting crypto users, with malware deployment tied to North Korean threat actor groups like TraderTraitor and Contagious Interview. The team also identified numerous companies being impersonated in these scams, including major crypto platforms like Coinbase, Binance, and Kraken, to alert potential victims. The research can be found here: Silent Push Pivots into New Lazarus Group Infrastructure, Acquires Sensitive Intel Related to $1.4B ByBit Hack and Past Attacks Learn more about your ad choices. Visit megaphone.fm/adchoices

This week, we are joined by Jon Williams, Vulnerability Researcher from Bishop Fox, discussing "Tearing Down (Sonic)Walls: Decrypting SonicOSX Firmware." Bishop Fox researchers reverse-engineered the encryption protecting SonicWall SonicOSX firmware, enabling them to access its underlying file system for security research. They presented their process and findings at DistrictCon Year 0 and released a tool called Sonicrack to extract keys from VMware virtual machine bundles, facilitating the decryption of VMware NSv firmware images. This research builds upon previous work, including techniques to decrypt static NSv images and reverse-engineer other encryption formats used by SonicWall. The research can be found here: Tearing Down (Sonic)Walls: Decrypting SonicOSX Firmware Learn more about your ad choices. Visit megaphone.fm/adchoices

This week, we are joined by Tom Hegel, Principal Threat Researcher from SentinelLabs research team, to discuss their work on "Ghostwriter | New Campaign Targets Ukrainian Government and Belarusian Opposition." The latest Ghostwriter campaign, linked to Belarusian government espionage, is actively targeting Ukrainian military and government entities as well as Belarusian opposition activists using weaponized Excel documents. SentinelLabs identified new malware variants and tactics, including obfuscated VBA macros that deploy malware via DLL files, with payload delivery seemingly controlled based on a target’s location and system profile. The campaign, which began preparation in mid-2024 and became active by late 2024, appears to be an evolution of previous Ghostwriter operations, combining disinformation with cyberattacks to further political and military objectives. The research can be found here: Ghostwriter | New Campaign Targets Ukrainian Government and Belarusian Opposition Learn more about your ad choices. Visit megaphone.fm/adchoices

Jim Walter, Senior Threat Researcher on SentinelLabs research team, to discuss their work on "HellCat and Morpheus | Two Brands, One Payload as Ransomware Affiliates Drop Identical Code." Over the past six months, new ransomware groups like FunkSec, Nitrogen, and Termite have emerged, while established threats such as Cl0p and LockBit 4.0 have resurfaced. Two prominent Ransomware-as-a-Service (RaaS) operations, HellCat and Morpheus, have gained traction, with research indicating that affiliates of both are using nearly identical ransomware payloads. Despite similarities in their encryption techniques and ransom notes, there is no conclusive evidence linking HellCat and Morpheus to the Underground Team, though shared tools or affiliates may be involved. The research can be found here: HellCat and Morpheus | Two Brands, One Payload as Ransomware Affiliates Drop Identical Code Learn more about your ad choices. Visit megaphone.fm/adchoices

This week we are joined by Silas Cutler, Principal Security Researcher at Censys, asking the important question of "Will the Real Volt Typhoon Please Stand Up?" The FBI's disruption of the KV Botnet in December 2023, attributed to the Chinese threat group Volt Typhoon, targeted infected systems but did not affect the botnet's control infrastructure. Despite law enforcement efforts and technical exposure, the botnet's infrastructure has remained largely stable, with only changes in hosting providers, raising questions about whether another party operates the botnet. Censys scanning data from 2024 shows a shift in the botnet's control servers, indicating a response to disruption attempts, while the botnet's operators have shown limited efforts to obscure their infrastructure. The research can be found here: Will the Real Volt Typhoon Please Stand Up? Learn more about your ad choices. Visit megaphone.fm/adchoices

This week we are joined by Phil Stokes, threat researcher at SentinelOne's SentinelLabs, discussing their work on "macOS FlexibleFerret | Further Variants of DPRK Malware Family Unearthed." Apple recently pushed an update to its XProtect tool, blocking several variants of the DPRK-linked Ferret malware family, which targets victims through the "Contagious Interview" campaign. The malware uses fake job interview processes to trick users into installing malicious software, and new variants, including FlexibleFerret, remain undetected by XProtect. SentinelOne's research reveals a deeper investigation into this malware, which uses social engineering to expand its attack vectors, including targeting developers through platforms like GitHub. The research can be found here: macOS FlexibleFerret | Further Variants of DPRK Malware Family Unearthed Learn more about your ad choices. Visit megaphone.fm/adchoices

This week, we are joined by Selena Larson from Proofpoint, and co-host of the "Only Malware in the Building" podcast, as she discusses the research on "Why Biasing Advanced Persistent Threats over Cybercrime is a Security Risk." The cybersecurity industry has historically prioritized Advanced Persistent Threats (APTs) from nation-state actors over cybercrime, but this distinction is outdated as cybercriminals now employ equally sophisticated tactics. Financially motivated threat actors, especially ransomware groups, have evolved to the point where they rival state-backed hackers in technical capability and impact, disrupting businesses, infrastructure, and individuals on a massive scale. To enhance security, defenders must shift focus from an APT-centric mindset to a broader approach that equally prioritizes combating cybercrime, which poses an immediate and tangible risk to global stability. The research can be found here: Why Biasing Advanced Persistent Threats over Cybercrime is a Security Risk Learn more about your ad choices. Visit megaphone.fm/adchoices