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Microsoft: CLFS Zero-Day Flaw Exploited in Ransomware Attacks

 

Ransomware attackers abused a zero-day flaw in a widely used Windows logging system for managing transactional information to launch attacks against organisations in the US real estate sector, Microsoft revealed Tuesday. 

In a blog post, the tech giant stated that the perpetrators employed a previously unknown flaw discovered in Windows' Common Log File System - a popular target for malicious actors seeking privilege escalation - to attack "a small number of targets," including American real estate firms, a Spanish software company, Venezuela's financial sector, and Saudi Arabia's retail sector. 

The flaw, identified as CVE-2025-29824, has a CVSS score of 7.8 and has been added to the Cybersecurity and Infrastructure Security Agency's "Known Exploited Vulnerabilities Catalogue". 

Microsoft stated that Storm-2460, a ransomware threat actor, used the issue to spread PipeMagic malware. In March, the firm addressed a different bug in the Windows Win32 Kernel Subsystem that allowed hackers to escalate privileges to the system level, an exploit that researchers later linked to targeted assaults targeting Asian and Saudi organisations using a PipeMagic backdoor.

The tech behemoth said it "highly recommends organizations apply all available security updates for elevation of privilege flaws to add a layer of defense against ransomware attacks if threat actors are able to gain an initial foothold.”

Microsoft noted that it has not yet determined how Storm-2460 got access to compromised devices, although it did note that the organisation downloaded malware from a legitimate third-party website it had previously infiltrated using the Windows certutil application.

Following the deployment of PipeMagic, the attackers used a technique that prevented them from writing data to disc and enabled them to launch the log system exploit directly in memory. In a security update posted on Tuesday, the company stated that users of Windows 11, version 24H2, "are not affected by the observed exploitation, even if the vulnerability was present.”

WinRAR Bug Circumvents Windows Mark of Web Security Notifications.

 

A security flaw in the WinRAR file archiver solution might be used to circumvent the Mark of the Web (MotW) security warning and execute arbitrary code on a Windows computer. The vulnerability is known as CVE-2025-31334 and impacts all WinRAR versions except the most recent release, 7.11. 

Mark of the Web is a security mechanism in Windows that uses a metadata value (an additional data stream called 'zone-identifier') to identify potentially dangerous files downloaded from the internet. When you launch an executable with the MotW tag, Windows informs you that it was obtained from the internet and can be risky, and you can choose whether to continue or terminate it.

Symlink to executable

The CVE-2025-31334 flaw allows an attacker to circumvent the MotW security warning when opening a symbolic link (symlink) to an executable file in any WinRAR version prior to 7.11. Using a specially designed symbolic link, an attacker can execute arbitrary code. It should be noted that on Windows, symlinks can only be generated with administrator privileges. 

The security flaw received a medium severity score of 6.8 and was fixed in the latest version of WinRAR, according to the applications change log: “If symlink pointing at an executable was started from WinRAR shell, the executable Mark of the Web data was ignored” - WinRaR. 

Shimamine Taihei of Mitsui Bussan Secure Directions reported the vulnerability to the Information Technology Promotion Agency (IPA) in Japan. The responsible disclosure was organised by Japan's Computer Security Incident Response Team with the developer of WinRAR.

Starting with version 7.10, WinRAR allows you to remove information from the MotW alternative data stream (such as location and IP address) that could be deemed a privacy issue. Cybercriminals, including state-sponsored ones, have previously used MotW bypasses to transmit malware without triggering the security warning. 

Recently, Russian attackers exploited a vulnerability in the 7-Zip archiver that did not propagate the MotW when double archiving (archiving one file within another) to launch the Smokeloader malware dropper.

WhatsApp for Windows Exposed to Security Risk Through Spoofing Vulnerability

 


Whatsapp for Windows has been recently revealed to have a critical security vulnerability known as CVE-2025-30401. This vulnerability has raised serious concerns within the cybersecurity community since it has been identified. The high severity of this vulnerability affects desktop versions of the application released before 2.2450.6, which could lead to an exploitation attack. An issue resulting from inconsistencies in the handling of file metadata enables threat actors to manipulate these inconsistencies in order to circumvent security checks. 

By exploiting this vulnerability, malicious actors can execute arbitrary code on targeted systems without user awareness, resulting in the possibility of unauthorized access to sensitive information or data compromise. Several security experts have emphasized that in order to mitigate the risks associated with this vulnerability, you must update your WhatsApp version to the latest version. Organizations and users of WhatsApp for Windows are strongly advised to apply the necessary patches immediately so that they are protected from threats. 

In accordance with the official security advisory, there is a critical inconsistency in how WhatsApp's desktop application deals with file attachments. There is a fundamental difference between the way the application determines how to display attachments using its MIME type versus the way the operating system interprets the file extension to determine how it should be opened or executed as a result. This difference in interpretation has created a serious security vulnerability. An attacker can create a malicious file that appears benign but is actually dangerous.

For instance, the attacker might use an MIME type that is typically used for images, along with an executable file extension such as exe, to craft a malicious file. Although the application would visually present it as safe, as per its MIME type, the operating system would handle it based on what its actual extension is. As a result of such a mismatch, users may be misled into opening a file that appears harmless but in reality is executable and thus allowing the execution of arbitrary code unintentionally by the user. As a result of such an attack vector, the likelihood of successful social engineering attacks and system compromises increases significantly. 

There has been a significant amount of research conducted on the issue, and the findings indicate that if a deliberate discrepancy was made between the MIME type and the extension of the file, it could have led the recipient unintentionally to execute arbitrary code by manually accessing the attachment within WhatsApp's desktop application, instead of just viewing its contents. This behavior represented a considerable threat, particularly in scenarios involving the user initiating the interaction. 

Fortunately, an independent security researcher who discovered this vulnerability and disclosed it to Meta through the company's Bug Bounty Program has been credited with responsibly disclosing it to the company, but the company does not appear to have confirmed whether the vulnerability has been actively exploited in the real world. It is important to note that such a security issue has not occurred on the platform in the past. 

In July 2024, WhatsApp was able to resolve a related security issue, which allowed Python and PHP attachments to be run automatically by Windows systems with the corresponding interpreters installed—without prompting the user. In the same vein, an incident similar to that of the platform highlighted the risks associated with the handling and execution of files incorrectly. In the end, these cases emphasize the importance of rigorous input validation and consistent file interpretation across all applications and operating systems, regardless of the type of application.

Due to its vast user base and widespread adoption, WhatsApp remains a highly valuable target for cyber threat actors, whether they are motivated by financial gain or geopolitical interests. The platform has become a recurring target of malicious campaigns because of its deep integration into users' personal and professional lives, coupled with the trust it commands. There have been several incidents in which attackers have exploited security vulnerabilities within WhatsApp to gain access to users' data, exfiltrate sensitive data, and install sophisticated malware as a result. 

A zero-day vulnerability that affects WhatsApp is particularly lucrative in underground markets, sometimes commanding a price of over one million dollars. Not only does the WhatsApp user base have a large footprint, but attackers can also gain an advantage by unknowingly accessing private conversations, media files, and even device-level abilities to gain a strategic advantage. Graphite, a form of spyware developed by Paragon, had been exploited by active hackers in March 2025 as a zero-click, zero-day vulnerability which WhatsApp remedied in March 2025. 

Using this exploit, the targeted individuals could be monitored remotely, without the victim having to interact with the attacker - an example of an advanced persistent threat campaign. An investigation by a research group based at the University of Toronto uncovered this surveillance campaign, which targeted journalists and members of civil society. The Citizen Lab was conducting the investigation, which was the source of the information. 

Following their report, WhatsApp swiftly acted to neutralize the campaign. Meta confirmed that the vulnerability had been silently patched in December 2024 without a client-side update being required. Despite being resolved without a formal CVE identifier being assigned, the issue is still of great importance to the global community. In order to protect platforms of such importance from exploitation, proactive vulnerability management, continuous security auditing, and cross-sector cooperation must be adopted. 

In the wake of the successful implementation of server-side mitigations, WhatsApp sent out security notifications on January 31 to roughly 90 Android users across over two dozen countries that had been affected by the vulnerability. Journalists and human rights activists in Italy were among the individuals alerted. They were identified as the targets of an elaborate surveillance operation using Paragon Graphite spyware, which utilized the zero-click exploit of a computer system. 

An Israeli cybersecurity firm known as NSO Group has been accused of violating American anti-hacking statutes by distributing its Pegasus spyware utilizing WhatsApp zero-day vulnerabilities in December of 2016, following a pattern of highly targeted cyber intrusions utilizing advanced surveillance tools. This incident follows a broader pattern of highly targeted cyber intrusions. Several evidences were provided to the court which indicated that at least 1,400 mobile devices had been compromised as a result of these covert attacks.

According to court documents, NSO Group carried out zero-click surveillance operations by deploying multiple zero-day exploits to compromise WhatsApp's systems. As part of the spyware delivery process, malicious messages were sent that did not require the recipient to interact with them at all, exploiting vulnerabilities within the messaging platform. Aside from that, the documents also allege that NSO developers reverse engineered WhatsApp's source code to create custom tools that could deliver these payloads, conduct that was deemed to have been illegal under state and federal cybersecurity laws. 

Those cases emphasize the increasing sophistication of commercial surveillance vendors as well as the necessity for robust legal and technical defenses to protect digital communication platforms, as well as the individuals who rely upon them, from abuse. As a result of these incidents, user must remain vigilant, maintain timely security updates, and strengthen the security measures within widely used communication platforms to reduce the risk of cyber-attacks. 

There has been an increasing prevalence of threat actors using sophisticated techniques to exploit even small inconsistencies, which is why it is essential to maintain a proactive and collaborative approach to cybersecurity. To maintain a secure digital environment, platform providers and end users both need to be aware of and responsible for their role as well.

Operation Zero Offers Up to $4M for Telegram Exploits

 

Operation Zero, a firm specializing in acquiring and selling zero-day vulnerabilities exclusively to Russian government entities and local companies, has announced a significant bounty for exploits targeting Telegram. The company is willing to pay up to $4 million for a full-chain exploit that could compromise the popular messaging app.

The exploit broker has set tiered rewards for different vulnerabilities:
  • Up to $500,000 for a one-click remote code execution (RCE) exploit.
  • Up to $1.5 million for a zero-click RCE exploit.
  • Up to $4 million for a full-chain exploit, potentially allowing hackers to gain full access to a target’s device.
Operation Zero’s focus on Telegram is strategic, given its widespread use in Russia and Ukraine. The company's offer provides insight into the Russian zero-day market, which remains largely secretive.

Exploit brokers often publicize bounties for vulnerabilities when they detect high demand. This suggests that the Russian government may have specifically requested Telegram exploits, prompting Operation Zero to advertise these high-value offers.

Zero-day vulnerabilities are particularly valuable because they remain unknown to software makers, making them highly effective for cyber operations. Among them, zero-click RCE exploits are the most sought after, as they require no user interaction—unlike phishing-based attacks—making them stealthier and more powerful.

A source familiar with the exploit market suggested that Operation Zero’s prices might be on the lower side, as the company could intend to resell these vulnerabilities multiple times at a higher margin.

“I don’t think they’ll actually pay full [price]. There will be some bar the exploit doesn’t clear, and they’ll only do a partial payment,” said the source.

Another industry expert noted that pricing depends on factors like exclusivity and whether Operation Zero intends to redevelop the exploits internally or act solely as a broker.

The Ukrainian government recently banned the use of Telegram for government and military personnel due to concerns over potential exploitation by Russian state-backed hackers. Security researchers have long warned that Telegram is less secure than alternatives like Signal and WhatsApp, primarily because it does not use end-to-end encryption by default.

“The vast majority of one-on-one Telegram conversations — and literally every single group chat — are probably visible on Telegram’s servers,” said cryptography expert Matthew Green.

Despite this, Telegram spokesperson Remi Vaughn stated: “Telegram has never been vulnerable to a zero-click exploit,” while also emphasizing the company’s bug bounty program.

The zero-day market has become increasingly competitive, driving up prices. In 2023, a WhatsApp zero-day was reportedly valued at $8 million. Operation Zero has previously offered $20 million for exploits capable of fully compromising iOS and Android devices but currently caps those payouts at $2.5 million.

With cyber threats escalating, the demand for zero-days—especially for widely used platforms like Telegram—remains at an all-time high.

Windows Shortcut Vulnerability Exploited by 11 State-Sponsored Outfits

 

Since 2017, at least 11 state-sponsored threat groups have actively exploited a Microsoft zero-day issue that allows for abuse of Windows shortcut files to steal data and commit cyber espionage against organisations across multiple industries. 

Threat analysts from Trend Micro's Trend Zero Day Initiative (ZDI) discovered roughly 1,000 malicious.lnk files that exploited the flaw, known as ZDI-CAN-25373, which allowed cyber criminals to execute concealed malicious commands on a victim's PC via customised shortcut files.

“By exploiting this vulnerability, an attacker can prepare a malicious .lnk file for delivery to a victim,” researchers at Trend Micro noted. “Upon examining the file using the Windows-provided user interface, the victim will not be able to tell that the file contains any malicious content.”

The malicious files delivered by cybercriminals include a variety of payloads, including the Lumma infostealer and the Remcos remote access Trojan (RAT), which expose organisations to data theft and cyber espionage. 

State-sponsored outfits from North Korea, Iran, Russia, and China, as well as non-state actors, are among those behind the flaw attacks, which have affected organisations in the government, financial, telecommunications, military, and energy sectors across North America, Europe, Asia, South America, and Australia. 

Additionally, 45% of attacks were carried out by North Korean players, with Iran, Russia, and China each accounting for approximately 18%. Some of the groups listed as attackers are Evil Corp, Kimsuky, Bitter, and Mustang Panda, among others.

According to Trend Micro, Microsoft has not fixed the flaw despite receiving a proof-of-concept exploit through Trend ZDI's bug bounty program. Trend Micro did not react to a follow-up request for comment on their flaw detection and submission timeline.

Microsoft's position remains that it will not be fixing the vulnerability described by Trend Micro at this time because it "does not meet the bar for immediate servicing under our severity classification guidelines," though the company "will consider addressing it in a future feature release," according to an email from a Microsoft spokesperson.

Meanwhile, Microsoft Defender can detect and block threat behaviour, as detailed by Trend Micro, and Microsoft's Windows Smart App Control prevents malicious files from being downloaded from the internet. Furthermore, Windows recognises shortcut (.lnk) files as potentially malicious file types, and the system will automatically display a warning if a user attempts to download one.

Critical Security Flaws Discovered in mySCADA myPRO SCADA System

Cybersecurity researchers have identified two high-severity vulnerabilities in mySCADA myPRO, a Supervisory Control and Data Acquisition (SCADA) system widely used in operational technology (OT) environments. These flaws could allow threat actors to gain unauthorized control over affected systems.

"These vulnerabilities, if exploited, could grant unauthorized access to industrial control networks, potentially leading to severe operational disruptions and financial losses," said Swiss security firm PRODAFT.

Both security flaws are rated 9.3 on the CVSS v4 scale and stem from operating system command injection issues:
  • CVE-2025-20014 – Allows attackers to execute arbitrary commands via crafted POST requests with a version parameter.
  • CVE-2025-20061 – Enables remote command execution using a POST request with an email parameter.
If exploited, these vulnerabilities could enable command injection and arbitrary code execution on affected systems.

Security Updates & Mitigation Measures

The issues have been addressed in the following patched versions:
  • mySCADA PRO Manager 1.3
  • mySCADA PRO Runtime 9.2.1
PRODAFT attributes the flaws to improper input validation, which creates an entry point for command injection attacks.

"These vulnerabilities highlight the persistent security risks in SCADA systems and the need for stronger defenses," the company stated. "Exploitation could lead to operational disruptions, financial losses, and safety hazards."

Organizations using mySCADA myPRO should take immediate action by:
  1. Applying the latest patches to eliminate vulnerabilities.
  2. Isolating SCADA systems from IT networks through network segmentation.
  3. Enforcing strong authentication measures to prevent unauthorized access.
  4. Monitoring system activity for signs of suspicious behavior.
By implementing these cybersecurity best practices, organizations can fortify their SCADA environments against potential attacks.

Cybercriminals Target Paragon Partition Manager Vulnerability in BYOVD Attacks

 


It has been reported that threat actors have been actively exploiting a security vulnerability within the BioNTdrv.sys driver of Paragon Partition Manager in ransomware attacks by elevating privileges and executing arbitrary code under the guise of attacks. The CERT Coordination Center (CERT/CC) has identified this zero-day vulnerability as CVE-2025-0289, one of five security flaws discovered by Microsoft during the past year. 

Other flaws have been identified, including arbitrary memory mapping, arbitrary memory write, null pointer dereferences, insecure kernel resource access, and arbitrary memory move vulnerabilities. It is especially concerning that an adversary may be able to exploit this vulnerability. It involves a Microsoft-signed driver, which allows adversaries to take advantage of the Bring Your Own Vulnerable Driver (BYOVD) technique. 

Using this method, attackers can compromise systems regardless of whether Paragon Partition Manager is installed, broadening the attack surface significantly. As BioNTdrv.sys operates at the kernel level, threat actors can exploit these vulnerabilities to execute commands with elevated privileges. This allows them to bypass security measures and defensive software, as attackers can access the system and deploy additional malicious payloads. 

Even though Microsoft researchers have identified all five security flaws, the company can not divulge what ransomware groups have been leveraging CVE-2025-0289 to execute their attacks. They are only aware that it has been weaponized in ransomware operations. A bulletin issued by Microsoft's CERT Coordination Center (CERT/CC) indicated that threat actors have been exploiting this vulnerability to conduct BYOVD-based ransomware attacks. 

According to the CVE-2025-0289 vulnerability, further malicious code within compromised environments can be executed by exploiting this vulnerability to escalate privileges to the SYSTEM level. This vulnerability can be exploited to facilitate the exploitation of BYOVD attacks, even on systems where the affected driver is not installed, and this can result in threat actors gaining elevated privileges and executing malicious code without the protection of security systems in place. 

As part of the identified security flaws affecting BioNTdrv.sys versions 1.3.0 and 1.5.1, CVE-2025-0285 is a flaw in version 7.9.1 which permits the mapping of kernel memory to arbitrary user inputs by not properly validating the length of the input. By exploiting this vulnerability, the user can escalate their privileges even further. 

There is a CVE-2025-0286 vulnerability that exists in version 7.9.1, resulting from improper validation of input controlled by users, which allows attackers to exploit this flaw to execute malicious code on the target machine. An unprivileged code execution vulnerability has been found in version 7.9.1, caused by an insufficient MasterLrp structure in the input buffer, which can result in a null pointer dereference vulnerability. 

Successful exploit allows arbitrary kernel-level code to be executed, facilitating privilege escalation and further misuse. Version 7.9.1 contains a vulnerability in the memmove function. This function fails to properly sanitize user-supplied data, allowing attackers to manipulate kernel memory and escalate privileges. 

Inversion of the CVE-2025-0289 vulnerability, an insecure kernel resource access vulnerability, has been found in version 17 of the Linux kernel due to a failure to validate the MappedSystemVa pointer before passing it to HalReturnToFirmware during the detection process. By exploiting this vulnerability, attackers can compromise the system. 

This security vulnerability has been addressed by Paragon Software by releasing the updated driver BioNTdrv.sys version 2.0.0 across all products within Paragon Software's Hard Disk Manager suite, including Partition Manager versions 17.45.0 and later versions. This update has been developed to reduce the risks associated with the previously identified security vulnerabilities. 

There is also a dedicated security patch available for 64-bit versions of Windows 10, Windows 11, and Windows Server 2016, 2019, 2022, and 2025 that will provide users with an additional layer of protection against any exploits that might occur in the future, thereby enhancing the level of security. As part of Microsoft's efforts to protect its ecosystem, it has updated its Vulnerable Driver Blocklist, which effectively disables the execution of BioNTdrv.sys versions that are compromised within Windows environments, thereby preventing exploitation. 

Users and enterprises are strongly encouraged to ensure that this protection mechanism is kept in place to prevent exploitation. In light of the ongoing threat posed by these vulnerabilities, especially as a result of ransomware attacks, all users of Paragon Partition Manager and its associated products must update their software as soon as possible to the newest version available. 

As a further precaution, all Windows users should make sure that they enable the Microsoft Vulnerable Driver Blocklist feature as soon as possible. This is because it serves as a critical defense against BYOVD (Bring Your Vulnerable Driver) attacks, where outdated or insecure drivers are leveraged to elicit privileges and compromise a computer system.

Qualcomm Identifies and Patches Critical Security Issues in Latest Update

 


Several vulnerabilities were identified in Qualcomm's latest security update for March 2025 that impacted many products, including automotive systems, mobile chipsets, and networking devices. There are several critical security issues in this security bulletin, including memory corruption risks and input validation flaws that could pose a significant security risk if exploited to compromise the system. 

The Qualcomm Security Updates are intended to improve the security of Qualcomm's technology ecosystem as well as strengthen its protection against possible cyber threats. There had been multiple security vulnerabilities identified and resolved by Qualcomm and MediaTek over the last few weeks, some of which had already been addressed by their respective Android updates, which were deployed in the previous weeks. 

Qualcomm released the March 2025 Security Bulletin, which outlined 14 vulnerabilities, all of which were addressed via upstream updates to its proprietary software, highlighting the serious potential risks associated with these security vulnerabilities. These security flaws are most of the time classified as critical or high severity, highlighting the seriousness of the threat they pose to users. Several of the vulnerabilities identified by Qualcomm include memory corruption, affecting Qualcomm's automotive software platform based on the QNX operating system.

Qualcomm has also released patches to resolve five high-severity vulnerabilities, which could result in information disclosures, denial-of-service (DoS) attacks, and memory corruption as a result. Furthermore, two moderate-severity flaws have been addressed as part of the latest security updates launched by the semiconductor manufacturer. 

The semiconductor manufacturer has also resolved seven high-severity defects and six medium-severe defects within open-source components launched by the manufacturer. As a result of these security patches, Qualcomm emphasized that OEMs (original equipment manufacturers) are being actively notified of the updates and urged them to implement the fixes on deployed devices as soon as possible. 

It is noteworthy that Google's March 2025 Android security update addressed three of the identified vulnerabilities: CVE-2024-43051, CVE-2025-53011, and CVE-2024-53025. It has been revealed that MediaTek has discovered ten security vulnerabilities that impact multiple chipsets. As part of the release of the company's fixes, three high-severity issues have been found, including a memory corruption flaw in modems, which can lead to DoS attacks, as well as an out-of-bounds write vulnerability in KeyInstall and WLAN, which can lead to escalation of privileges. 

This security bulletin from Qualcomm not only addresses vulnerabilities identified in proprietary software, but also vulnerabilities in open-source components that Qualcomm's products are integrated with. There are several security flaws affecting Android operating systems, camera drivers, and multimedia frameworks, among others. Qualcomm intends to mitigate the potential risks of these vulnerabilities by informing its customers and partners and strongly urging that patches be deployed as soon as possible to mitigate these risks. 

Users of Qualcomm-powered devices should check with their device manufacturers to learn about the availability of security updates and patches for those devices. During the last few months, Qualcomm has released a series of security updates demonstrating its commitment to increasing cybersecurity across all its product lines. By addressing critical vulnerabilities and working closely with original equipment manufacturers (OEMs) to facilitate timely patch deployments, the company aims to decrease security risks and enhance the integrity of its systems. 

As the threat of cyber-attacks continues to evolve, maintaining robust security measures through regular updates is imperative. According to Qualcomm, their users are encouraged to stay informed about security developments and to ensure they get the latest patches installed on their devices to prevent any possible exploitation of the vulnerabilities. In addition, organizations that are utilizing Snapdragon-powered systems are also encouraged to make sure that these updates are implemented promptly as a means of ensuring that their technology infrastructure is secure and reliable.