LibreOffice, a popular free office suite, recently fixed a major security flaw that could have let hackers run harmful files on Windows computers. The issue, identified as CVE-2025-0514, was related to how the software handled links inside documents. If exploited, it could allow attackers to trick users into opening dangerous files.
How the flaw worked
LibreOffice allows users to click on hyperlinks in documents to open websites or files. Normally, it blocks links that try to open unsafe files, but older versions (before 24.8.5) failed to properly check certain types of links.
Hackers found a way to trick the software by using specially designed web addresses. When a user clicked one of these deceptive links, LibreOffice could mistakenly treat it as a local file path and execute harmful programs. Unlike other document-based attacks that require macros, this method only needed the user to click a link, making it especially dangerous.
LibreOffice fixes the issue
To prevent such attacks, LibreOffice released version 24.8.5 on February 25, 2025. The update improves how the software checks links, ensuring that unsafe web addresses cannot be mistaken for local files.
Developers Caolán McNamara from Collabora Productivity and Stephen Bergman from allotropia worked on fixing the issue after it was reported by security researcher Amel Bouziane-Leblond. The flaw highlighted how small errors in how software reads links can create serious security risks.
What users should do
This vulnerability could be used in phishing scams where hackers send fake documents to trick people into clicking malicious links. To stay safe, users should update their LibreOffice software immediately.
Here are some steps to stay protected:
1. Install the latest LibreOffice update (24.8.5 or later) to fix the issue
2. Be cautious with documents from unknown sources, especially if they contain links
3. Avoid clicking hyperlinks in documents unless you trust the sender
4. Businesses should ensure all their computers are updated to reduce security risks
The importance of updates
While this flaw mainly affected Windows users, it highlights the need for strong security measures in office software. Cybercriminals constantly find new ways to exploit common tools, making software updates and user awareness essential.
So far, there are no known real-world attacks using this vulnerability, but security experts consider it critical. Users can download the latest LibreOffice version from the official website or update it through Linux package managers.
LightSpy has been executed in targeted attacks, it uses watering hole techniques and exploit-based delivery, coupled with an infrastructure that swiftly escapes detection. LightSpy was first reported in 2020, targeting users in Hong Kong.
LightSpy has been historically famous for attacking messaging apps like WeChat, Telegram, QQ, Line, and WhatsApp throughout different OS. According to ThreatFabric report, the framework can extract payment data from WeChat, remove contacts, wipe out messaging history, and alot of other things.
The compromised things include WiFi network details, iCloud Keychain, screenshots, location, browser history, photos, call history, and SMS texts.
Regarding server analysis, the LightSpy researcher said they "share similarities with prior malicious infrastructure but introduce notable differences in the command list."
Further, "the servers analyzed in this research As previously observed, the cmd_list endpoint is at /ujmfanncy76211/front_api. Another endpoint, command_list, also exists but requires authentication, preventing direct analysis."
In 2024, ThreatFabric reported about an updated malware version that has destructive capability to stop compromised device from booting up, in addition to the number of supported plugins from 12 to 28.
Earlier research has disclosed potential overlaps between an Android malware called "DragonEgg" and LightSpy, showing the threat's cross-platform nature.
Hunt.io's recent analysis study of the malicious command-and-control (C2) infrastructure linked with the spyware has found support for more than 100 commands spread across iOS, macOS, Linux, routers, and Windows.
Commenting on the overall impact of the malware, Hunt.io experts believe “LightSpy's infrastructure reveals previously unreported components and administrative functionality.” However, the experts remain unsure if it symbolizes new growths or earlier versions not publicly reported. “Command set modifications and Windows-targeted plugins suggest that operators continue to refine their data collection and surveillance approach across multiple platforms,” concludes
Limit app permissions to avoid unwanted access to important data. “On Android, use Privacy Dashboard to review and revoke permissions; on iOS, enable App Privacy Reports to monitor background data access.”
Turn on advanced device security features that restrict the exploitability of devices. iOS users can enable Lockdown Mode and Android users can turn on Enhanced Google Play Protect and use protection features to identify and block suspicious activities.
Ransomware remains a major problem for businesses, and a new cybercriminal group is expanding at an alarming rate. Security researchers at ReliaQuest have identified BlackLock as the fastest-growing ransomware operation today, with its activity increasing by 1,425% since late 2024. Although it is currently the seventh most active ransomware group, experts predict it could become the biggest threat in 2025.
Despite law enforcement cracking down on major ransomware gangs like LockBit in 2024, the number of cyberattacks continues to grow. A report from January 31 suggested ransomware incidents had risen by 15% compared to the previous year. However, a February 20 study by Symantec showed a slower increase of just 3%. No matter the rate, the takeaway is the same, ransomware remains a serious risk.
How BlackLock Ransomware Operates
BlackLock ransomware is designed to infect Windows, Linux, and VMware ESXi systems, making it a versatile and dangerous threat. Cybercriminals behind this operation have developed unique methods to pressure victims into paying ransom quickly.
1. Blocking access to stolen data
2. Recruiting criminals to assist with attacks
Steps to Protect Your Systems
Security experts recommend taking immediate action to strengthen defenses, especially for companies using VMware ESXi servers. Here are some key steps:
1. Turn off unnecessary services
2. Strengthen security restrictions
3. Limit network access
Additional recommendations include:
1. Activating multi-factor authentication (MFA) to prevent unauthorized logins.
2. Disabling Remote Desktop Protocol (RDP) on systems that do not need remote access.
The rapid rise of BlackLock ransomware shows that cybercriminals ar constantly developing new strategies to pressure victims and avoid detection. Organizations must take proactive steps to secure their networks and stay informed about emerging threats. Implementing strong security controls today can prevent costly cyberattacks in the future.
The campaign attacked healthcare, government, and education organizations, targeting around 150 victims, according to Abnormal Security. The attacks aim to get access to corporate mail accounts for sending emails to more victims inside a company or launch money motivated campaigns such as business e-mail compromise (BEC), where the money is directly sent to the attackers’ accounts.
ADFS from Microsoft is a verification mechanism that enables users to log in once and access multiple apps/services, saving the troubles of entering credentials repeatedly.
ADFS is generally used by large businesses, as it offers single sign-on (SSO) for internal and cloud-based apps.
The threat actors send emails to victims spoofing their company's IT team, asking them to sign in to update their security configurations or accept latest policies.
When victims click on the embedded button, it takes them to a phishing site that looks same as their company's authentic ADFS sign-in page. After this, the fake page asks the victim to put their username, password, and other MFA code and baits then into allowing the push notifications.
The phishing page asks the victim to enter their username, password, and the MFA code or tricks them into approving the push notification.
The security report by Abnormal suggests, "The phishing templates also include forms designed to capture the specific second factor required to authenticate the targets account, based on the organization's configured MFA settings.” Additionally, "Abnormal observed templates targeting multiple commonly used MFA mechanisms, including Microsoft Authenticator, Duo Security, and SMS verification."
After the victim gives all the info, they are sent to the real sign-in page to avoid suspicious and make it look like an authentic process.
However, the threat actors immediately jump to loot the stolen info to sign into the victim's account, steal important data, make new email filter rules, and try lateral phishing.
According to Abnormal, the threat actors used Private Internet Access VPN to hide their location and allocate an IP address with greater proximity to the organization.
The FBI has warned the public, private sector, and the world about the “victimization of US-based businesses”, as cyberattacks involving remote IT workers from North Korea are on the rise. It has noticed North Korean IT workers gaining illegal access to systems to steal confidential data and launch other cyber-crime operations.
In an FBI announcement reported by Forbes, it was disclosed that “victims have seen proprietary data and code held to ransom,” and “the copying of corporate code repositories to attacker user profiles and personal cloud accounts.” Additionally, the attackers have also “attempted harvesting of company credentials and session cookies for further compromise opportunities.”
Law enforcement and intelligence agencies like the FBI and NSA (National Security Agency) have advised the principle of least privilege, to “only allow designated administrator accounts to be used for administrative purposes.” The aim is to limit the administrative rights available to Mac and Windows users to ensure security.
The principle of least privilege gives admin account access to only selected people, and nobody else. The method ensures company employees only have access to particular resources needed to get the job done, not admin rights. For instance, the user account completes day-to-day needs, whereas for something critical, like software installation, the systems will ask for admin credentials.
Wikipedia is one great example of using this technique, it has user accounts for making backups that don’t need to install software and only have rights for running backups and related applications.
The FBI suggests businesses disable local administrator accounts and restrict privileges for installing remote desktop apps, keeping an eye out for any unusual network traffic. It has warned organizations to remember that “North Korean IT workers often have multiple logins into one account in a short period of time,” coming from various IP addresses linked with different countries.
The agency has also advised HRs, development teams, and hiring managers to focus “on changes in address or payment platforms during the onboarding process.”
In a recent multi-stage cyberattack, Cyble Research and Intelligence (CRIL) found an attack campaign hitting the manufacturing industry. The campaign depends upon process injection techniques aimed at delivering malicious payloads like Amaday Bot and Lumma Stealer.
Using a chain of evasive actions, the threat actor (TA) exploits diverse Windows tools and processes to escape standard security checks, which leads to persistent system control and potential data theft.
CRIL found an advanced multi-level attack campaign that starts with a spear-phishing mail. The email has a link that directs to an LNK file, hidden as a PDF file. When the fake PDF is clicked, it launches a series of commands. The LNK file is hosted on a WebDAV server, making it challenging for security software to trace.
“For instance, one of the malicious links observed in the campaign was hxxp://download-695-18112-001-webdav-logicaldoc[.]cdn-serveri4732-ns.shop. The attack’s effectiveness stems from its ability to exploit the name of a legitimate cloud-based document management system (LogicalDOC), commonly used in manufacturing and engineering industries, to convince targets into opening the file,” reports the Cyber Express.
After executing the LNK file, it opens ssh.exe, a genuine system utility that can escape security software checks. Via ssh.exe, a PowerShell command is activated to retrieve an extra payload via a remote server from mshta.exe.
Threat actors use this process to avoid detection via Google’s Accelerated Mobile Pages (AMP) framework merged with a compressed URL. The retrieved payload is a malicious script containing extra hacked commands that gradually deliver the last malicious payload to the target system.
Once the LNK file is executed, it launches ssh.exe, a legitimate system utility that can bypass security software’s detection. Through ssh.exe, a PowerShell command is triggered, which fetches an additional payload from a remote server using mshta.exe. This process is designed to evade detection by using Google’s Accelerated Mobile Pages (AMP) framework combined with a shortened URL.
The payload fetched is a script that contains additional obfuscated commands that eventually deliver the final malicious payload to the victim’s system.
CYBLE blog says, “The final payload, which involves the deployment of both Lumma stealer and Amadey bot, highlights the TA’s intent to steal sensitive information and maintain persistent control over compromised systems. Yara and Sigma rules to detect this campaign, are available for download from the linked GitHub repository.”
Advanced hacking toolkit Winos4.0 spreads across the globe, security experts warn. Originally reported by Trend Micro, this new toolkit-just like known kits Cobalt Strike and Sliver-was connected to a string of recent cyber attacks in China, having initially spread through fake software downloads. This year, Fortinet reported that the toolkit is also disseminated through game-themed files, which now tends to expand and might pose a risk to a larger user base.
Attack Framework
Winso4.0 is a post-exploitation toolkit: after successfully gaining initial access to a system, the attackers use it for further invasion and domination. First, it was discovered inside the applications downloaded by users who considered it software in their interest, including VPNs or Google Chrome downloads for the Chinese market. Under the aliases Void Arachne or Silver Fox, the attackers entice users with these very popular applications full of malicious components designed to compromise their systems.
New strategies involve attackers using game applications, via which they have broadcasted Winos4.0, again targeting Chinese users mainly. This way, hackers change and utilise attractive downloads to penetrate devices.
Infection Stages
When one of such benign-looking files is downloaded by a victim, the Winos4.0 toolkit initiates a four-phase infection:
1. Stage 1: After installation, a DLL file you.dll, was retrieved from a remote domain. This file installed persistence on the device by setting values in the Windows Registry such that the malware would persist after the system restarts:.
2. Stage 2: At this step, the injected shellcode is loaded to download necessary APIs and communicate with a C2 server, which enables hackers to send commands and retrieve files from the infected device.
3. Stage 3: It fetches more encoded data from the C2 server in a second DLL file named上线模块.dll which saves to the Windows Registry to be used later, apart from updating server addresses to maintain an active link between the malware and its operators.
4. Final Stage: The last stage (login module.dll) will activate all main functions of the toolkit, including detailed system data gathering (like IP address and type of OS), detection of security tools, searching for crypto-wallets, and keeping a hidden backdoor. Through this backdoor connection, hackers can exfiltrate data, execute commands, and sustain their activity monitoring.
Evasion Techniques
Winos4.0 already has an inbuilt scanner for the detection of security products, including commercial products by Kaspersky, Avast, Bitdefender, and Malwarebytes. It will then change its behaviour to avoid detection or even quit if the toolkit finds itself running in an environment that is under surveillance. This versatility makes the tool very dangerous when it gets into cybercriminals' hands.
Emerging Menace
The fact that the toolkit Winos4.0 is still being used and fine-tuned points towards the growing importance of this toolkit in cyberattack strategies. As explained by Fortinet, it is a versatile and powerful framework "designed for remote control of compromised systems." Ongoing activity like this indicates that Winos4.0 is becoming a tool hackers like to use to gain control over Windows machines.
Preventive Actions
Always ready for downloading is a constant warning from the security experts to users, especially when it comes to free softwares or games which seem popular.
Avoid downloading applications and other forms of files from unknown sources. Even verifying if the software or file is coming from a legitimate source may also save it from infection. Moreover, one's security software must be updated frequently.
Knowing the threats of Winos4.0 would prevent many users from this malicious software by making them aware of this sophisticated malware.
Japan Computer Emergency Response Team (JPCERT/CC) has published guidance on early identification of ransomware attacks in the system using Windows Event Logs. Probably by reviewing these logs, firms would identify some signs or clues of an existing ransomware attack and find themselves in a position to forestall this threat from spreading across the network.
JPCERT/CC stresses that the discovery of ransomware as early in the attack as possible is extremely important. Many ransomware variants leave apparent traces in Windows Event Logs, and that particular knowledge might be useful for cybersecurity teams to discover and finally stop attacks before they spread further. It's a strategy especially valuable in identifying the type of attack and tracing how ransomware might have entered the system.
Types of Event Logs to Monitor
The agency recommends checking four main types of Windows Event Logs, namely: Application, Security, System, and Setup logs. These types can carry some very important clues left by ransomware along with how it came into the environment and what systems are under attack.
Identifiable Ransomware Signatures in Event Logs
This JPCERT/CC report includes several specific log entries associated with certain ransomware families, which indicate that this was an active attack.
Others, such as 8base and Elbie, also create similar patterns along with traces related to this malware.
Other older ransomware families, like Shade, GandCrab, and Vice Society, similarly display the same event patterns. They especially generate errors with event IDs 13 and 10016, linked to the failed access attempts to COM applications. The reason behind it is ransomware tries to remove Volume Shadow Copies so the victims won't be able to recover encrypted files.
Event Log Monitoring: Not a Silver Bullet But a Mighty Defence
Monitoring these specific Windows Event Logs can certainly prove extremely useful in identifying ransomware, though JPCERT/CC believes such should only be part of the total security strategy. This would truly be transformational were early detection to be combined with other control measures against spreading the attack.
Surprisingly, this method is much more potent for newer ransomware variants rather than those already in the wild, like WannaCry and Petya, which left very minor traces in Windows logs. As ransomware continues to progress, the patterns they leave behind in logs are becoming very obvious, and log monitoring will be more of a good ear for today's cybersecurity infrastructure.
In 2022, another well-known cybersecurity group also published a SANS ransomware detection guide from Windows Event Logs. Both sources point out how ransomware detection has evolved with time, helping organisations better prepare for such threats.
But there is a good side to it, since the flaw has not been found for 18 years, chances are it hasn't been exploited. Additionally, AMD is patching its platforms to protect the affected processors, however, not all have received a patch yet. See this list for full details.
Sinkclose is known for escaping anti-viruses and persistence even after reinstalling OS. The bug allows threat actors to execute code within AMD processors' SMM (System Management System), a privileged region kept for critical firmware operations. To use the flaw, threat actors must first gain access to the system's kernel, a difficult task, but doable. But the system must already have been targeted by some other attack.
After securing the access, the Sinkclose vulnerability lets the attackers install bootkit malware that escapes detection by antivirus tools, staying hidden within the system and persists even after re-installing the OS.
The flaw uses a feature in AMD chips called TClose, which maintains compatibility with older devices. By exploiting this feature, the experts could redirect the processor to execute their code at the SMM level. The process is complicated but lets attackers with access and control over the device.
Cybersecurity experts Krzysztof Okupski and Enrique Nissim from IOActive found the Sinkclose vulnerability, they will present it at the Defcon conference."To take advantage of the vulnerability, a hacker has to already possess access to a computer's kernel, the core of its operating system," AMD said to Wired.
Experts highlight that although the Sinkclose exploit needs kernel-level access, the flaws at this level are found in Linux and Windows systems. Advanced state-sponsored hackers might already have what it takes to exploit these flaws.
Experts suggest kernel exploits are readily available, which makes Sinkclose the second stage for the threat actors. To eliminate the malware, one must open the computer and connect to a particular part of its memory using an SPI Flash programmer, inspect the memory with caution, and then remove the malware.
The incident started with a routine software update. Microsoft users worldwide were waiting for new features and security updates. But an update had a secret landmine- a hidden sensor within CrowdStrike's Falcon software.
The damage was sudden and severe. Organizations stopped working, government agencies had problems, and important services were hindered. The breakdown underscored our reliance on tech and the downside of interconnected systems.
CrowdStrike's Falcon software overlooks network security, identifying threats and anomalies. The fault sensor was in the update and triggered a chain reaction. It misunderstood genuine traffic as suspicious, which led to worldwide chaos.
Experts have underscored the need for rigorous testing, questions were raised about the presence of critical bugs. The answers lie in the hasty development cycles and rush to meet the deadlines. Quality control was ignored, resulting in dangerous consequences.
For Users
For Developers
The CrowdStrike-Microsoft debacle serves as a wake-up call. The hyper-connected reality has weaknesses too, a minor glitch can turn into global turmoil.
The disappearing password problem affected Chrome users worldwide, causing them trouble finding saved passwords. Users even had trouble finding newly saved passwords. Google has fixed the issue now, saying the problem was in the M127 version of Chrome Browser on Windows devices.
It is difficult to pinpoint the exact numbers, but based on Google’s 3 Billion Chrome users worldwide, with the majority of Chrome users, we can get a positive estimate. According to experts, around 15 million users experienced the vanishing password problem. "Impacted users were unable to find passwords in Chrome's password manager. Users can save passwords, however it was not visible to them. The impact was limited to the M127 version of Chrome Browser on the Windows platform," said Google.
Fortunately, Google has now fixed the issue, users only need to restart their Chrome browsers. “We apologize for the inconvenience this service disruption/outage may have caused,” said Google. If a user has any inconveniences beyond what Google has covered, they are free to contact Google Workplace Support.
Google's Chrome password manager may be accessed through the browser's three-dot menu by selecting Passwords & Autofill, then Google Password Manager. Alternatively, you can install the password manager Chrome app from the password manager settings and then access it from the Google Apps menu. If Chrome invites you to autofill a password, clicking Manage Passwords will take you directly there.
According to cybersecurity reporter Brian Krebs, the email verification while creating a new Google Workplace Account also went missing for a few Chrome users.
The authentication problem, which is now fixed, allowed threat actors to skip the email verification needed to create a Google Workplace account, allowing them to mimic a domain holder at third-party services. This allowed a threat actor to log in to third-party services like a Dropbox account.