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Microsoft on Thursday said it’s once again disabling the  ms-appinstaller protocol handler  by default following its abuse by multiple threat actors to distribute malware. “The observed threat actor activity abuses the current implementation of the ms-appinstaller protocol handler as an access vector for malware that may lead to ransomware distribution,” the Microsoft Threat Intelligence team  said . It further noted that several cybercriminals are offering a malware kit for sale as a service that leverages the MSIX file format and ms-appinstaller protocol handler. The  changes  have gone into effect in App Installer version 1.21.3421.0 or higher. The attacks take the form of signed malicious MSIX application packages that are distributed via Microsoft Teams or malicious advertisements for legitimate popular software on search engines like Google. At least four different financially motivated hacking groups have been observed taking advantage of the App I...

Poorly managed Microsoft SQL (MS SQL) servers are the target of a new campaign that's designed to propagate a category of malware called  CLR SqlShell  that ultimately facilitates the deployment of cryptocurrency miners and ransomware. "Similar to web shell, which can be installed on web servers, SqlShell is a malware strain that supports various features after being installed on an MS SQL server, such as executing commands from threat actors and carrying out all sorts of malicious behavior," AhnLab Security Emergency response Center (ASEC)  said  in a report published last week. A stored procedure is a subroutine that contains a set of Structured Query Language (SQL) statements for use across multiple programs in a relational database management system (RDBMS). CLR (short for common language runtime) stored procedures – available in SQL Server 2005 and later – refer to  stored procedures  that are written in a .NET language such as C# or Visual Basic. ...

A newly uncovered security flaw in the Windows operating system can be exploited to coerce remote Windows servers, including Domain Controllers, to authenticate with a malicious destination, thereby allowing an adversary to stage an  NTLM relay attack  and completely take over a Windows domain. The issue, dubbed " PetitPotam ," was discovered by security researcher Gilles Lionel, who shared technical details and proof-of-concept (PoC) code last week, noting that the flaw works by forcing "Windows hosts to authenticate to other machines via MS-EFSRPC EfsRpcOpenFileRaw function." MS-EFSRPC  is Microsoft's Encrypting File System Remote Protocol that's used to perform "maintenance and management operations on encrypted data that is stored remotely and accessed over a network." Specifically, the attack enables a domain controller to authenticate against a remote NTLM under a bad actor's control using the MS-EFSRPC interface and share its authen...

Some weeks in security feel loud. This one feels sneaky. Less big dramatic fireworks, more of that slow creeping sense that too many people are getting way too comfortable abusing things they probably shouldn’t even be touching. There’s a little bit of everything in this one, too. Weird delivery tricks, old problems coming back in slightly worse forms, shady infrastructure doing shady infrastructure things, and the usual reminder that if criminals find a workflow annoying, they’ll just make a new one by Friday. Efficient little parasites. You almost have to respect the commitment. A few of these updates have that nasty “yeah, that tracks” energy. Stuff that sounds niche right up until you picture it landing in a real environment with real users clicking real nonsense because they’re busy and tired and just trying to get through the day. Then it stops being abstract pretty fast. So yeah, this week’s ThreatsDay Bulletin is a solid scroll-befor...

5G is a game changer for mobile connectivity, including mobile connectivity to the cloud. The technology provides high speed and low latency when connecting smartphones and IoT devices to cloud infrastructure. 5G networks are a critical part of all infrastructure layers between the end user and the end service; these networks transmit sensitive data that can be vital for governments and businesses, not to mention individuals. As a result, 5G networks are a prime target for attackers. For this reason, cybersecurity has been a key consideration in developing the 5G standard. 5G encompasses robust security features that guarantee confidentiality, integrity, and availability of network services and user data. In this article, Seva Vayner, Product Owner of  Gcore's Edge Cloud service , gives a deep dive into five of 5 G's cutting-edge security measures. He also delves into the pivotal performance capabilities of 5G, accompanied by use cases that demonstrate how contemporary, cloud...

A Chinese cyberespionage group known for targeting Southeast Asia leveraged flaws in the Microsoft Exchange Server that came to light earlier this March to deploy a previously undocumented variant of a remote access trojan (RAT) on compromised systems. Attributing the intrusions to a threat actor named  PKPLUG  (aka  Mustang Panda  and HoneyMyte), Palo Alto Networks' Unit 42 threat intelligence team said it identified a new version of the modular PlugX malware, called THOR, that was delivered as a post-exploitation tool to one of the breached servers. Dating back to as early as 2008,  PlugX  is a fully-featured second-stage implant with capabilities such as file upload, download, and modification, keystroke logging, webcam control, and access to a remote command shell. "The variant observed [...] is unique in that it contains a change to its core source code: the replacement of its trademark word 'PLUG' to 'THOR,'" Unit 42 researchers Mike Harbison an...

Microsoft has disclosed a new security vulnerability impacting on-premise versions of Exchange Server that it said has come under active exploitation in the wild. The vulnerability, tracked as CVE-2026-42897 (CVSS score: 8.1), has been described as a spoofing bug stemming from a cross-site scripting flaw. An anonymous researcher has been credited with discovering and reporting the issue. "Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network," the tech giant said in a Thursday advisory. Microsoft, which tagged the vulnerability with an "Exploitation Detected" assessment, said an attacker could weaponize it by sending a crafted email to a user, which, when opened in Outlook Web Access and subject to other "certain interaction conditions," can allow arbitrary JavaScript code to be executed in the context of the web brow...

You've always been warned not to share remote access to your computer with any untrusted people for many reasons—it's basic cyber security advice, and common sense, right? But what if I say, you should not even trust anyone who invites or offers you full remote access to their computers? Security researchers at cybersecurity firm Check Point have discovered more than two dozen vulnerabilities in both open-source RDP clients and Microsoft's own proprietary client that could allow a malicious RDP server to compromise a client computer, reversely. RDP, or Remote Desktop Protocol, allows users to connect to remote computers. The protocol is usually used by technical users and IT administrators to remotely connect to other devices on the network. RDP was initially developed by Microsoft for its Windows operating system, but there are several open source clients for the RDP protocol that can be used on Linux as well as Unix systems. Check Point researchers recently ...

The threat actors behind the Medusa ransomware have claimed nearly 400 victims since it first emerged in January 2023, with the financially motivated attacks witnessing a 42% increase between 2023 and 2024. In the first two months of 2025 alone, the group has claimed over 40 attacks, according to data from the Symantec Threat Hunter Team shared with The Hacker News. The cybersecurity company is tracking the cluster under the name Spearwing. "Like the majority of ransomware operators, Spearwing and its affiliates carry out double extortion attacks, stealing victims' data before encrypting networks in order to increase the pressure on victims to pay a ransom," Symantec noted . "If victims refuse to pay, the group threatens to publish the stolen data on their data leaks site." While other ransomware-as-a-service (RaaS) players like RansomHub (aka Greenbottle and Cyclops), Play (aka Balloonfly), and Qilin (aka Agenda, Stinkbug, and Water Galura) have benefite...

Malicious actors are using a legitimate Rust-based injector called  Freeze[.]rs  to deploy a commodity malware called XWorm in victim environments. The novel attack chain, detected by Fortinet FortiGuard Labs on July 13, 2023, is initiated via a phishing email containing a booby-trapped PDF file. It has also been used to introduce Remcos RAT by means of a crypter called SYK Crypter, which was first documented by Morphisec in May 2022. "This file redirects to an HTML file and utilizes the 'search-ms' protocol to access an LNK file on a remote server," security researcher Cara Lin  said . "Upon clicking the LNK file, a PowerShell script executes Freeze[.]rs and SYK Crypter for further offensive actions." Freeze[.]rs, released on May 4, 2023, is an  open-source red teaming tool  from Optiv that functions as a payload creation tool used for circumventing security solutions and executing shellcode in a stealthy manner. "Freeze[.]rs utilizes multiple te...

The Russia-linked threat actor known as Gamaredon (aka Shuckworm) has been attributed to a cyber attack targeting a foreign military mission based in Ukraine with an aim to deliver an updated version of a known malware called GammaSteel. The group targeted the military mission of a Western country, per the Symantec Threat Hunter team, with first signs of the malicious activity detected on February 26, 2025. "The initial infection vector used by the attackers appears to have been an infected removable drive," the Broadcom-owned threat intelligence division said in a report shared with The Hacker News. The attack started with the creation of a Windows Registry value under the UserAssist key, followed by launching "mshta.exe" using "explorer.exe" to initiate a multi-stage infection chain and launch two files. The first file, named "NTUSER.DAT.TMContainer00000000000000000001.regtrans-ms," is used to establish communications with a command-and...

Another week in cybersecurity. Another week of "you've got to be kidding me." Attackers were busy. Defenders were busy. And somewhere in the middle, a whole lot of people had a very bad Monday morning. That's kind of just how it goes now. The good news? There were some actual wins this week. Real ones. The kind where the good guys showed up, did the work, and made a dent. It doesn't always happen, so when it does, it's worth noting. The bad news? For every win, there's a fresh headache waiting right behind it. New tricks, old tricks dressed up in new clothes, and a few things that'll make you want to go touch grass and never log back in. But you will. We all do. So here's everything that mattered this week — the wins, the warnings, and the stuff you really shouldn't ignore. ⚡ Threat of the Week Tycoon 2FA and LeakBase Operations Dismantled — The infrastructure hosting the Tycoon2FA service, which Europol said was among the largest advers...

The Russian state-sponsored threat actor known as APT29 has been linked to an advanced phishing campaign that's targeting diplomatic entities across Europe with a new variant of WINELOADER and a previously unreported malware loader codenamed GRAPELOADER. "While the improved WINELOADER variant is still a modular backdoor used in later stages, GRAPELOADER is a newly observed initial-stage tool used for fingerprinting, persistence, and payload delivery," Check Point said in a technical analysis published earlier this week. "Despite differing roles, both share similarities in code structure, obfuscation, and string decryption. GRAPELOADER refines WINELOADER's anti-analysis techniques while introducing more advanced stealth methods." The use of WINELOADER was first documented by Zscaler ThreatLabz in February 2024, with the attacks leveraging wine-tasting lures to infect diplomatic staff systems. While the campaign was first attributed to a threat activity...

Cybersecurity researchers have flagged fresh activity from a China-aligned threat actor known as Webworm in 2025, deploying custom backdoors that employ Discord and Microsoft Graph API for command-and-control (C2 or C&C) communications. Webworm, first publicly documented by Broadcom-owned Symantec in September 2022, is assessed to be active since at least 2022, targeting government agencies and enterprises spanning IT services, aerospace, and electric power sectors in Russia, Georgia, Mongolia, and several other Asian nations. Attacks mounted by the group have leveraged remote access trojans (RATs) like Trochilus RAT, Gh0st RAT, and 9002 RAT (aka Hydraq and McRat). The threat actor is said to overlap with China-nexus clusters tracked as FishMonger (aka Aquatic Panda), SixLittleMonkeys , and Space Pirates . SixLittleMonkeys is best known for deploying Gh0st RAT and a RAT called Mikroceen targeting entities in Central Asia, Russia, Belarus, and Mongolia. "In recent ye...

Some of the biggest security problems start quietly. No alerts. No warnings. Just small actions that seem normal but aren't. Attackers now know how to stay hidden by blending in, and that makes it hard to tell when something’s wrong. This week’s stories aren’t just about what was attacked—but how easily it happened. If we’re only looking for the obvious signs, what are we missing right in front of us? Here’s a look at the tactics and mistakes that show how much can go unnoticed. ⚡ Threat of the Week Apple Zero-Click Flaw in Messages Exploited to Deliver Paragon Spyware — Apple disclosed that a security flaw in its Messages app was actively exploited in the wild to target civil society members in sophisticated cyber attacks. The vulnerability, CVE-2025-43200, was addressed by the company in February as part of iOS 18.3.1, iPadOS 18.3.1, iPadOS 17.7.5, macOS Sequoia 15.3.1, macOS Sonoma 14.7.4, macOS Ventura 13.7.4, watchOS 11.3.1, and visionOS 2.3.1. The Citizen Lab said it u...

What happens when cybercriminals no longer need deep skills to breach your defenses? Today’s attackers are armed with powerful tools that do the heavy lifting — from AI-powered phishing kits to large botnets ready to strike. And they’re not just after big corporations. Anyone can be a target when fake identities, hijacked infrastructure, and insider tricks are used to slip past security unnoticed. This week’s threats are a reminder: waiting to react is no longer an option. Every delay gives attackers more ground. ⚡ Threat of the Week Critical SAP NetWeaver Flaw Exploited as 0-Day — A critical security flaw in SAP NetWeaver (CVE-2025-31324, CVSS score: 10.0) has been exploited by unknown threat actors to upload JSP web shells with the goal of facilitating unauthorized file uploads and code execution. The attacks have also been observed using the Brute Ratel C4 post-exploitation framework, as well as a well-known technique called Heaven's Gate to bypass endpoint protections. ...