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Screenshots of VirusTotal.com showing file properties of original GoldMax malware and the new variant

Combing through the fuzz: Using fuzzy hashing and deep learning to counter malware detection evasion techniques

Today’s cybersecurity threats continue to find ways to fly and stay under the radar. Cybercriminals use polymorphic malware because a slight change in the binary code or script could allow the said threats to avoid detection by traditional antivirus software ... continue reading
When coin miners evolve, Part 1: Exposing LemonDuck and LemonCat, modern mining malware infrastructure

When coin miners evolve, Part 1: Exposing LemonDuck and LemonCat, modern mining malware infrastructure

[Note: In this two-part blog series, we expose a modern malware infrastructure and provide guidance for protecting against the wide range of threats it enables. Part 1 covers the evolution of the threat, how it spreads, and how it impacts ... continue reading
Protecting customers from a private-sector offensive actor using 0-day exploits and DevilsTongue malware

Protecting customers from a private-sector offensive actor using 0-day exploits and DevilsTongue malware

The Microsoft Threat Intelligence Center (MSTIC) alongside the Microsoft Security Response Center (MSRC) has uncovered a private-sector offensive actor, or PSOA, that we are calling SOURGUM in possession of now-patched, Windows 0-day exploits (CVE-2021-31979 and CVE-2021-33771). Private-sector offensive actors are ... continue reading
Microsoft discovers threat actor targeting SolarWinds Serv-U software with 0-day exploit

Microsoft discovers threat actor targeting SolarWinds Serv-U software with 0-day exploit

Microsoft has detected a 0-day remote code execution exploit being used to attack SolarWinds Serv-U FTP software in limited and targeted attacks. The Microsoft Threat Intelligence Center (MSTIC) attributes this campaign with high confidence to DEV-0322, a group operating out ... continue reading
Screenshot of command line showing extraction of filesystem from the firmware

Microsoft finds new NETGEAR firmware vulnerabilities that could lead to identity theft and full system compromise

The continuous improvement of security solutions has forced attackers to explore alternative ways to compromise systems. The rising number of firmware attacks and ransomware attacks via VPN devices and other internet-facing systems are examples of attacks initiated outside and below ... continue reading
Behind the scenes of business email compromise: Using cross-domain threat data to disrupt a large BEC campaign

Behind the scenes of business email compromise: Using cross-domain threat data to disrupt a large BEC campaign

Microsoft 365 Defender researchers recently uncovered and disrupted a large-scale business email compromise (BEC) infrastructure hosted in multiple web services. Attackers used this cloud-based infrastructure to compromise mailboxes via phishing and add forwarding rules, enabling these attackers to get access ... continue reading
Breaking down NOBELIUM’s latest early-stage toolset

Breaking down NOBELIUM’s latest early-stage toolset

As we reported in earlier blog posts, the threat actor NOBELIUM recently intensified an email-based attack that it has been operating and evolving since early 2021. We continue to monitor this active attack and intend to post additional details as ... continue reading
World map showing global distribution of Phorpiex botnet ativity

Phorpiex morphs: How a longstanding botnet persists and thrives in the current threat environment

Phorpiex, an enduring botnet known for extortion campaigns and for using old-fashioned worms that spread via removable USB drives and instant messaging apps, began diversifying its infrastructure in recent years to become more resilient and to deliver more dangerous payloads ... continue reading
Business email compromise campaign targets wide range of orgs with gift card scam

Business email compromise campaign targets wide range of orgs with gift card scam

Cybercriminals continue to target businesses to trick recipients into approving payments, transferring funds, or, in this case, purchasing gift cards. This kind of email attack is called business email compromise (BEC)—a damaging form of phishing designed to gain access to ... continue reading
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Surface expands its Secured-core portfolio with the new Surface Laptop 4 powered by AMD Ryzen™ Mobile Processors

As operating systems are becoming more secure and resistant to compromise, advanced vectors like firmware, kernel and hardware direct memory access (DMA) have emerged as new favored targets for threat actors. Recent trends indicate a substantial growth in the number ... continue reading