How ransomware operators try to stay under the radar

An often heard remark is that when your security solution notices a ransomware attack, it’s already too late. Theres a lot of truth in that, if you consider the encryption process to be the ransomware attack. However, these days encryption is just a part of many ransomware attacks. Some of the...

A New Face of AsyncRAT Utilizes WSF Scripts to Spread

Summary: AsyncRAT is a remote access trojan RAT malware known for stealing credentials and executing various malicious activities since 2019. Its recent variant, distributed through WSF script files, employs sophisticated fileless techniques, emphasizing the importance of user caution and robust...

NimExec - Fileless Command Execution For Lateral Movement In Nim

Basically, NimExec is a fileless remote command execution tool that uses The Service Control Manager Remote Protocol MS-SCMR. It changes the binary path of a random or given service run by LocalSystem to execute the given command on the target and restores it later via hand-crafted RPC packets...

Malicious NuGet Package Targeting .NET Developers with SeroXen RAT

A malicious package hosted on the NuGet package manager for the .NET Framework has been found to deliver a remote access trojan called SeroXen RAT. The package, named Pathoschild.Stardew.Mod.Build.Config and published by a user named Disti, is a typosquat of a legitimate package called...

BunnyLoader: New Malware-as-a-Service Threat Emerges in the Cybercrime Underground

Cybersecurity experts have discovered yet another malware-as-a-service MaaS threat called BunnyLoader that's being advertised for sale on the cybercrime underground. "BunnyLoader provides various functionalities such as downloading and executing a second-stage payload, stealing browser credential...

Linux/x64 - memfd_create ELF loader Shellcode (170 bytes)

Shellcode Title: Linux/x64 - memfdcreate ELF loader 170 bytes Shellcode Author: Ivan Nikolsky enty8080 & Tomas Globis tomasglgg Tested on: Linux x8664 Shellcode Description: This shellcode attempts to establish reverse TCP connection, reads ELF length, reads ELF and maps it into the memory, creat...

New Python-Based Fileless Malware Named ‘PyLoose’ Targeting Cloud Environments

Threat Level Attack Report For a detailed threat advisory, download the pdf file here Summary A new fileless attack called PyLoose targets cloud workloads by loading an XMRig Miner directly into memory using Python code and the memfd technique. This evasive attack highlights the need for advanced...

Python-Based PyLoose Fileless Attack Targets Cloud Workloads for Cryptocurrency Mining

A new fileless attack dubbed PyLoose has been observed striking cloud workloads with the goal of delivering a cryptocurrency miner, new findings from Wiz reveal. "The attack consists of Python code that loads an XMRig Miner directly into memory using memfd, a known Linux fileless technique,"...

PyLoose: Python-based fileless malware targets cloud workloads to deliver cryptominer

PyLoose is a newly discovered Python-based fileless malware targeting cloud workloads. Get a breakdown of how the attack unfolds and the steps to mitigate it...

A proxyjacking campaign is looking for vulnerable SSH servers

A researcher at Akamai has posted a blog about a worrying new trend--proxyjacking--where criminals sell your bandwidth to a third-party proxy service. To understand how proxyjacking works, well need to explain a few things. There are several legitimate services that pay users to share their surpl...

Webinar recap: EDR vs MDR for business success

Did you miss our recent webinar on EDR vs. MDR? Don't worry, we've got you covered! In this blog post, we'll be recapping the highlights and key takeaways from the webinar hosted by Marcin Kleczynski, CEO and co-founder of Malwarebytes, and featuring guest speaker Joseph Blankenship, Vice Preside...

Detecting and Visualizing Lateral Movement Attacks with Trellix Helix Connect - Part 2

Detecting and Visualizing Lateral Movement Attacks with Trellix Helix Connect - Part 2 By Maulik Maheta · May 21, 2023 This blog was also written by Chintan Shah Executive summary In the part 1 of this series we discussed in depth about the known Lateral movement attacks like abusing weak service...

Upcoming webinar: Is EDR or MDR better for your business?

Don't miss our upcoming webinar on EDR vs. MDR! In the webinar, Marcin Kleczynski, CEO and co-founder of Malwarebytes, and guest speaker Joseph Blankenship, Vice President and research director at Forrester, discuss topic such as: The difference between EDR and MDR, how EDR solutions can be...

A week in security (April 24 -30)

Last week on Malwarebytes Labs: LockBit and Cl0p ransomware gangs actively exploiting Papercut vulnerabilities Update now: Critical flaw in VMWare Fusion and VMWare Workstation Magecart threat actor rolls out convincing modal forms Fileless attacks: How attackers evade traditional AV and how to...

Fileless attacks: How attackers evade traditional AV and how to stop them

When you hear about malware, theres a good chance you think of sketchy executables or files with extensions like .DOCX or .PDF that, once opened, execute malicious code. These are examples of file-based attacks--and while they can be bad, theyre nothing compared to their fileless cousins. As the...

Silence is golden partner for Truebot and Clop ransomware

A recent rise in the number of Truebot infections has been attributed to a threat actor known as the Silence Group. The Silence Group is an initial access broker IAB that frequently changes tools and tactics to stay on top of the game. An IAB's primary task is to find a weakness or vulnerability,...

New campaign uses government, union-themed lures to deliver Cobalt Strike beacons

By Chetan Raghuprasad and Vanja Svajcer. Cisco Talos discovered a malicious campaign in August 2022 delivering Cobalt Strike beacons that could be used in later, follow-on attacks. Lure themes in the phishing documents in this campaign are related to the job details of a government organization i...

Malwarebytes receives highest rankings in recent third-party tests

Malwarebytes Endpoint Protection continues to receive outstanding results in third-party testing. Our recent participation in two highly-regarded industry evaluations, namely MRG-Effitas and Info-Techs Data Quadrant Report, reflects our belief that continual testing and unbiased validation are...

Cryptojackers growing in numbers and sophistication

With rising energy costs and increased volatility in the value of cryptocurrencies, we were bound to see a rise in malicious cryptomining, aka cryptojacking. If you dont know whether you will ever see a return on your investments in mining equipment, one will look for other opportunities. But if...

Hardware-based threat defense against increasingly complex cryptojackers

Even with the dip in the value of cryptocurrencies in the past few months, cryptojackers – trojanized coin miners that attackers distribute to use compromised devices’ computing power for their objectives – continue to be widespread. In the past several months, Microsoft Defender Antivirus detect...