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In this week’s Tales From Ransomware, we take a look at a ransomware that isn’t really ransomware. Nor even malware. But it can hijack your server anyway.
A few days ago we saw a typical Remote Desktop Protocol (RDP) attack, which lead us to believe that it was a similar attack to theone we told you abouta few months ago which cybercriminals are using to infect devices with ransomware. But we were very wrong.
First of all because instead of encrypting data, it locks the desktop with a password that the victim doesn’t know. Secondly, it does not demand a ransom (!) in exchange for the credential, but rather seeks to keep the device locked for as long as possible so that it can be used for bitcoin mining for as long as possible. And thirdly, it doesn’t use malware as such.
Jan 31, 2013 In this video I will show you how to remove Desktop Lock if RST Anti Desktop-Lock cant be executed in the Remote PC/RDP.OS Details: Microsoft Windows Version 6.0.6002Windows Server StandardVideo: How to remove Desktop Locker when RST Anti Desktop-Lock cant be executed on Remote pC enjoyc. When I tried to log in, it came up with a screen that looked somewhat like a desktop, but was a program calling itself 'Virtual Screen' by a company called 'Toplang'. The effect of the Virtual Screen is that I am locked out of my Server unless I enter an admin password, which needless to say I don't have, since I have never seen or heard of. Aug 14, 2020 To make matters worse, some variants of Locker ransomware delete the Shadow Volume Copies of victims' files, thus making restoring the files an impossible task. The name of Locker ransomware varies by version. At time of research, cyber criminals released Locker v1.7, Locker V2.16, Locker v2.60, Locker v3.5.3, Locker v.3.49, and Locker V5.52. Desktop Lock Express is a security software that can lock your screen to prevent people from accessing your computer. It is one of the Desktop Lock family, which provides the major features of Desktop Lock but decrease its size to about 40KB.
Download Desktop Lock Express - A simple-to-use program that allows you to block other users' access to your screen by setting up passwords, while running on low system resources.
Once they’ve gained access to your machine by brute force (this particular server was fielding 900 attempts daily) the attacker copies a file called BySH01.zip. This in turn contains:
- BySH01.exe (executable through AutoIt)
- 7za.exe (goodware, the well-known free tool 7zip)
- tcping.exe (goodware, a tool for performing TCP pings)
- MW_C.7z (a compressed password-protected file), which contains:
- An application –goodware for bitcoin mining
- An application –goodware for blocking the Windows desktop
The attacker runs the BySH01.exe file, and the following interface appears:
With the help of our colleagues at Panda Russia, those of us who don’t know Russian can get an approximate idea of what its telling us with the above word list.
Basically, the bitcoin mining application uses this interface to configure how many cores to use, what extension of processor instructions to use, what “wallet” to send the bitcoins to, etc. Once the desired configuration is selected, the attacker clicks on Установить to install and run the bitcoins mining application. The application is called CryptoNight, which was designed for mining bitcoins using CPUs.
Then they click on Локер, which installs and runs the desktop lock application. It is the commercial application Desktop Lock Express 2, modified only so that the information shown in the properties of the file are the same as those of the system file svchost.exe. Finally it clears all the files used in the attack except CryptoNight and Desktop Lock Express 2.
We detected and blocked several attacks in different countries. Examples such as this one show how, once again, cybercriminals take advantage of weak passwords that can be guessed using the brute force method over a given period of time. Malware is no longer necessary to gain access to the system, so it’s up to you to use a robust password that will keep out unwanted visitors.
Tips for the System Admin
In addition to using a solution like Adaptive Defense, which detects and prevents this kind of attack, a couple of tidbits of advice for all administrators who have to have an open RDP:
- Configure it to use a non-standard port. What 99.99% of cybercriminals do is track all Internet on TCP and UDP ports 3389. They might bother to track others, but they do not have to, since most do not change these ports. Those who do change ports do so because they are careful about security, which probably means that their credentials are already complex enough to not be gotten by brute force within any reasonable amount of time.
- Monitor failed RDP connection attempts. Brute force attacks can easily be identified in this way, since they use automated systems and can be seen making a new attempt every few seconds.
Desktop Lock Express is an access control software which can lock your screen to prevent people from accessing your computer. Desktop Lock Express is a lite version of Desktop Lock. It provides the major features of Desktop Lock with only the necessary options. It can be used directly without the need of installing, all features have been. Download Desktop Lock Express for Windows now from Softonic: 100% safe and virus free. More than 71 downloads this month. Download Desktop Lock Express.
'Desktop Lock Express is a tool that locks your computer to prevent unwanted access to it. The program locks the keyboard, mouse, and display without needing to have a 'lock' button for your computer. There is no need to install Desktop Lock Express because the single EXE file contains everything you need. Although the program contains lots of customizable features, you can leave the default settings and it will work just fine -- just set an unlock password. Desktop Lock Express is small -- only about 140KB.
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Desktop Locker Express
The program will keep locking the computer if it is rebooted without being unlocked first. Once the computer boots, locking will be enabled. Also, you can prevent the computer from being shut down while it is in locked mode.
The program is compatible with Windows 95, 98, Me, 2000, NT, XP, 2003, Vista, and later, as well 64-bit versions of Windows.
Desktop Lock Express Description Desktop Lock Express is an access control software that can lock your screen to prevent people from accessing your computer. It is one of the Desktop Lock products family, which provides the major features of Desktop Lock but decreased its size, removed unnecessary options. Desktop Lock Express can be used directly without the need of installing, all features have been included in the single exe file. Desktop Lock Express can safely lock computer on Windows NT/2000/XP/2003/Vista and later as well as Windows x64 editions. Disclaimer Desktop Lock Express is a product developed. This site is not directly affiliated with. All trademarks, registered trademarks, product names and company names or logos mentioned herein are the property of their respective owners.
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Please find the DMCA / Removal Request below. How to uninstall Desktop Lock Express? How do I uninstall Desktop Lock Express in Windows Vista / Windows 7 / Windows 8? • Click 'Start' • Click on 'Control Panel' • Under Programs click the Uninstall a Program link. • Select 'Desktop Lock Express' and right click, then select Uninstall/Change.
• Click 'Yes' to confirm the uninstallation. How do I uninstall Desktop Lock Express in Windows XP? • Click 'Start' • Click on 'Control Panel' • Click the Add or Remove Programs icon.
• Click on 'Desktop Lock Express', then click 'Remove/Uninstall.' • Click 'Yes' to confirm the uninstallation.
How do I uninstall Desktop Lock Express in Windows 95, 98, Me, NT, 2000? • Click 'Start' • Click on 'Control Panel' • Double-click the 'Add/Remove Programs' icon. • Select 'Desktop Lock Express' and right click, then select Uninstall/Change. • Click 'Yes' to confirm the uninstallation. Frequently Asked Questions • How much does it cost to download Desktop Lock Express? Download Desktop Lock Express from official sites for free using QPDownload.com.
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Additional information about license you can found on owners sites.• How do I access the free Desktop Lock Express download for PC? Just click the free Desktop Lock Express download button at the top left of the page.
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Clicking this link will start the installer to download Desktop Lock Express free for Windows.• Will this Desktop Lock Express download work on Windows? . The free Desktop Lock Express download for PC works on most current Windows operating systems.
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