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BlackByte ransomware attacks Microsoft Exchange servers through ProxyShell vulnerabilities



After the release of the free decryptor from Trustwave, several new versions of BlackByte have appeared.

The BlackByte ransomware group hacks into corporate networks through ProxyShell vulnerabilities in Microsoft Exchange servers.

ProxyShell is the name of a bundle of three vulnerabilities in Microsoft Exchange, the combined exploitation of which makes it possible to remotely execute arbitrary code on a server without authorization. The vulnerabilities were fixed in April and May 2021:

CVE-2021-34473 – Access Control List (ACL Bypass). Fixed in April 2021 in the KB5001779 update;

CVE-2021-34523 – Privilege Escalation in Exchange PowerShell Backend. Fixed in April 2021 in the KB5001779 update;

CVE-2021-31207 – Remote Code Execution. Fixed in May 2021 in KB5003435.

Security Researchers at Red Canary analyzed BlackByte attacks and found that they were being carried out through ProxyShell by installing web shells on servers. Using web shells, attackers upload the Cobalt Strike beacon, which is embedded in the Windows Update Agent process, onto the attacked server. Cobalt Strike is then used to steal credentials from a service account on a compromised system. After hijacking the account, the attackers install the tool for remote access to the AnyDesk system and perform lateral movement across the network.

Typically, ransomware operators use third-party tools in attacks to escalate their privileges and deploy ransomware on the network. However, in the case of BlackByte, the main role is played by the executable file of the malware itself, capable of escalating privileges and moving around the network like a worm.

The malware sets three registry values ​​- for local privilege escalation, enabling network connection sharing between all privilege levels, and resolving long path values ​​for directories, names and file namespaces.

Before encryption, the malware deletes the “Raccine Rules Updater” scheduled task to prevent it from being intercepted at the last minute and erases shadow copies directly through WMI objects using an obfuscated PowerShell command.

As a result, stolen files are archived using WinRAR and displayed through anonymous file sharing services like “” or “”

Since cybersecurity company Trustwave released a free tool to recover BlackByte encrypted files back in October 2021, it is unlikely that the ransomware continues to use the same encryption tactics. In other words, new BlackByte victims are unlikely to be able to recover their files using the Trustwave decryptor. Red Canary specialists have already recorded several “fresh” BlackByte variants.

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Can Microsoft Defender antivirus be disabled in Windows 11?



microsoft defender has reached a spectacular level of maturing with windows 10. What started as a basic malware protection more serious, it has become one of the best antiviruses on the market, with the advantage that it is free, lightweight, and is already included and activated with the operating system. However, there are times that we may be interested in deactivating it, but is it possible to do it with Windows 11?

When we install a third-party antivirus, Microsoft Defender is disabled. However, there may be times when it is not deactivated properly, or there may be times when we simply want to temporarily disable the antivirus to install something that is detected as a false positive. It is also possible that, on a weak computer, Microsoft Defender consumes a lot of resources; especially when booting the system. There are lighter options, or if we don’t have the internet connected device, we may not even need the antivirus.

Windows 11 allows you to disable antivirus

In the Security section of Windows 11, luckily, we can disable many antivirus functions, including Real-time Protection, which is the one that usually causes problems when it comes to detecting false positives in files that we know are safe. This protection can only temporarily deactivate, but the rest of the protection modules can be permanently disabled.

So, effectively, we can temporarily disable the protection in Windows. To do this, we go to Settings in Windows 11, and there we enter the Privacy security tab. In there, let’s windows security. Once there, click on the option that says Antivirus and threat protection. In there, we just have to go to the part of managing the configuration of Real-time protection, and disable it.

It can also be permanently disabled

This deactivation is temporary, so if we want to deactivate it completely, we will have to go to the Local Group Policy Editor. To go to this section, it is necessary to disable the function of Tamper Protection within the same section where real-time protection is temporarily disabled.

To do this, we look for theLocal Group Policy Editor«, or gpedit.msc. In there, let’s Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Antivirus. Once we get there, we look for the option «Disable Microsoft Defender Antivirus«. We double click, and we give Enabled. Now we just have to restart, and we will have the Windows 10 antivirus permanently disabled.

These are the best options we have for disable Microsoft Defender in Windows 11. Another option is to use programs like Defender Control or Configure Defender. This type of program allows you to manage a multitude of settings directly from the program and with a couple of clicks without having to navigate through the system settings.

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ALL LG Smart TVs can be hacked through the Internet and DTT



The SmartTV They have all kinds of protection mechanisms against vulnerabilities. Some even integrate antivirus to prevent malware from entering them, and all their apps are carefully analyzed. However, they always end up discovering vulnerabilities, so some people prefer not to connect tvs to the internet. The problem is that they got to hack some remotely without even having them connected to the Internet.

The vulnerability has been discovered by the hacker David Buchanan, also know as retr0id. This fault consists of remote code execution via DVB-T standard. In other words, the broadcast of the exploit is carried out through the signal that reaches DTT through the antenna socket. Needless nor that the TV is connected to the Internet in order to exploit the vulnerability.

It hacks through DVB-T and HbbTV

The error consists in executing scripts to generate a DVB-T transmission with metadata from HbbTV, the standard used LovesTV. With these scripts, a web page is loaded on top of the video feed, containing a V8 n-day exploit. Buchanan says that now all he needs to do is find another vulnerability that allows him to escalate privileges on the TV for even more absolute control.

The exploit works on a 2019 LG Smart TVs. Until now, this type of attack required the Smart TV to be connected to the Internet, but now all it takes is for it to be turned on. Buchanan says it may also be possible to hack a TV that’s turned off, but he needs to keep testing.

The bug is still unpatched on LG TVs, whose latest update was released last January 13th. The vulnerability has been published on January 14, so LG has not had time to fix it yet. Although the bug has been exploited on a 2019 TV, Buchanan says the bug can be exploited on 2020 and 2021 models. However, these models use newer versions of Chrome as their browser, so an n-day exploit will be needed. different.

In the video that Buchanan has uploaded to his Twitter account, you can see how you can get almost total control of the TV, showing notifications, messages, and even choosing the video you want to play on it.

The vulnerability demolishes all those comments that say that “if you are concerned about your privacy, do not connect the TV to the Internet”. Now, it is possible to hack LG TVs without them being connected to the Internet. However, the flaw can be mitigated by disabling HbbTV’s autostart feature, although Buchanan says that many other vulnerabilities remain in DVB.

Any LG TV can now be rooted

With this exploit it is possible root lg tv. There is a tool called RootMyTV, which makes it easier to take advantage of the vulnerability to install the homebrew channel on a TV after rooting it. Thanks to this, it is possible to install unauthorized applications and created by the community, such as moonlit to remotely play your PC games (since webOS does not have the Steam Link app), YouTube with enhanced features, RetroArch to play emulators, and many more to come in the future.

lg rootmytv

After the vulnerability, they have updated RootMyTV to the version 2.0, where, just by entering the website of from an LG television, it is already possible root it to install apps on it. All current LG models can be rooted with this method, including those updated to version 04.30.57 released this week. The automatic system updates are disabled after rooting in case there is any problem with the updates. In case you want unroot, you just have to do a factory-reset of the TV to return it to the factory settings, so the method is quite safe.

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Security problems detected in the official app of the Olympic Games



On the eve of a new edition of the Winter Olympics that will take place in Beijing, China, during the next month, a series of security problems were detected in an official application of the sporting event, which is expected to be widely used by athletes and reporters who will attend the instance.

Citizen Lab, an Internet security firm, said in a report that the MY2022 application has serious deficiencies in its encryption, a condition that would make users’ confidential data, plus any other data communicated through said app, vulnerable to being pirated. Other important user data in the app was not encrypted at all, according to the report.

Olympic committee app has vulnerabilities

The above implies that the data transmitted through the application could be read by Chinese Internet service providers or telecommunications companies through Wi-Fi access points in hotels, airports and Olympic venues.

Specifically, according to citizen lab report, the MY2022 app shares information directly with some Chinese companies such as Huawei, Xiaomi, Oppo, Vivo, Meizu, Tencent, Weibo, AutoNavi and iFlytek, varying the type of data according to each case. Also, the presence of invalid SSL certificates was reported, a condition that hinders the encryption of sensitive information.

The report indicates that the application is mandatory for those attending the sporting event. Without going too far, the official guide of the International Olympic Committee instructs attendees to download the application before visiting China. However, the IOC issued a statement yesterday, noting that this smartphone app was not mandatory. The IOC also rejected the Citizen Lab report, saying that two independent cybersecurity testing organizations had found no critical vulnerabilities with the app.

China is requiring all international Olympics attendees, including coaches and journalists, to log into a health monitoring system at least 14 days before they leave. They can use the app to do this, or they can still log in through a web browser on a PC. The app allows its users to submit required health information on a daily basis and is part of China’s aggressive effort to manage the coronavirus pandemic as it hosts the games, which begin on February 4. The app also has chat features, file transfers, weather updates, tourist recommendations, and GPS navigation.

Given the environment with these technologies, many countries are advising their athletes not to bring their normal smartphones to China, but to bring temporary phones, or burners, that do not store any sensitive personal data, according to news reports.


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