Fileless Multi-Stage Remcos RAT: From Phishing to Memory-Resident Execution

Fileless Multi-Stage Remcos RAT: From Phishing to Memory-Resident Execution By Madhini Muralidharan · March 11, 2026 Traditional malware campaigns rely heavily on dropping executable files to disk—artifacts that defenders can scan, quarantine, and analyze with signature-based security tools. Mode...

Fileless protection explained: Blocking the invisible threat others miss

Most antivirus software for personal users scans your computer for malware hiding in files. This is, after all, how most malware is traditionally spread. But what about attacks that never create files? Fileless malware is a fast-growing threat that evades traditional antivirus software, because...

China-Linked Hackers Exploit Windows Shortcut Flaw to Target European Diplomats

A China-affiliated threat actor known as UNC6384 has been linked to a fresh set of attacks exploiting an unpatched Windows shortcut vulnerability to target European diplomatic and government entities between September and October 2025. The activity targeted diplomatic organizations in Hungary,...

NSIS Abuse and sRDI Shellcode: Anatomy of the Winos 4.0 Campaign

Co-authored byAnna Širokova and Ivan Feigl Executive summary Rapid7 has been tracking a malware campaign that uses fake software installers disguised as popular apps like VPN and QQBrowser—to deliver Winos v4.0, a hard-to-detect malware that runs entirely in memory and gives attackers remote...

New VPN Backdoor

A newly discovered VPN backdoor uses some interesting tactics to avoid detection: When threat actors use backdoor malware to gain access to a network, they want to make sure all their hard work can't be leveraged by competing groups or detected by defenders. One countermeasure is to equip the...

New PoC Exploit for Apache OfBiz Vulnerability Poses Risk to ERP Systems

Cybersecurity researchers have developed a proof-of-concept PoC code that exploits a recently disclosed critical flaw in the Apache OfBiz open-source Enterprise Resource Planning ERP system to execute a memory-resident payload. The vulnerability in question is CVE-2023-51467 CVSS score: 9.8, a...

Attackers Use Event Logs to Hide Malware

Researchers have discovered a malicious campaign utilizing a never-before-seen technique for quietly planting fileless malware on target machines. The technique involves injecting shellcode directly into Windows event logs. This allows adversaries to use the Windows event logs as a cover for...

What is fileless malware?

Unlike traditional malware, which relies on a file being written to a disk, fileless malware is intended to be memory resident only, ideally leaving no trace after its execution. The malicious payload exists in the computer’s memory, which means nothing is ever written directly to the hard drive...

CVE-2020-0856

An information disclosure vulnerability exists when Active Directory integrated DNS ADIDNS mishandles objects in memory. An authenticated attacker who successfully exploited this vulnerability would be able to read sensitive information about the target system. To exploit this condition, an...

Memhunter - Live Hunting Of Code Injection Techniques

Memhunter is an endpoint sensor tool that is specialized in detecing resident malware, improving the threat hunter analysis process and remediation times. The tool detects and reports memory-resident malware living on endpoint processes. Memhunter detects known malicious memory injection...

Stealthy Microsoft SQL Server Backdoor Malware Spotted in the Wild

Cybersecurity researchers claim to have discovered a previously undocumented backdoor specifically designed for Microsoft SQL servers that could allow a remote attacker to control an already compromised system stealthily. Dubbed Skip-2.0 , the backdoor malware is a post-exploitation tool that run...

Fileless malware: getting the lowdown on this insidious threat

Traditionally, malware attacks as we have always known them are files written to disk in one form or another that require execution in order to carry out their malicious scope. Fileless malware, on the other hand, is intended to be memory resident only, ideally leaving no trace after its executio...

Iron Rain: What Defines a Cyber Insurgency?

“A fool pulls the leaves. A brute chops the trunk. A sage digs the roots.” - Pierce Brown The western world is currently grappling with a cyber insurgency. The widespread adoption of the “kill-chain” coupled with the use of memory resident malware has fueled the cyber-attack wild fire. The securi...

Tools Used by Lamberts APT Found in Vault 7 Dumps

Links have emerged connecting targeted attacks going back a decade against high-profile government, industrial and financial targets around the world to hacking tools and documents leaked in the Vault 7 dump. Researchers at Kaspersky Lab today published a technical report on the activities of a...

Microsoft SQL 2000 Slammer Worm Denial of Service (CVE-2002-0649)

Slammer is a memory resident worm targeted to attack Microsoft SQL 2000. By propagating rapidly, the worm can cause a denial of service condition on affected targets...

CVE-2006-3648

Unspecified vulnerability in Microsoft Windows 2000 SP4, XP SP1 and SP2, Server 2003 and 2003 SP1, allows remote attackers to execute arbitrary code via unspecified vectors involving unhandled exceptions, memory resident applications, and incorrectly "unloading chained exception."...

CVE-2006-3648

Unspecified vulnerability in Microsoft Windows 2000 SP4, XP SP1 and SP2, Server 2003 and 2003 SP1, allows remote attackers to execute arbitrary code via unspecified vectors involving unhandled exceptions, memory resident applications, and incorrectly "unloading chained exception."...