It is possible to decrypt Excel files and restore them without a password. You can decrypt Excel files by removing the password, using the VBA code, or using the Excel password removal tool. And you can recover lost Excel files from the Recycle bin and retrieve files by searching the file name or applying EaseUS Data Recovery Wizard.
Q1: "I recently encrypted some of my files in Windows 10 and kept my encryption key in my Documents folder in C drive. I reinstalled Windows OS the other day, and the encryption key was lost due to formatting. Can I decrypt the file without the certificate?"
Decrypt Dmg File Without Key
Q2: "Unknown viruses encrypted all files and folders on my USB pen drive. I was threatened to pay Bitcoin to recover encrypted files, which I don't want to. I need a way to decrypt encrypted files without a password."
In this article, we will provide a full guide on how to decrypt a file online without a key. And, if your files are encrypted by ransomware, use the robust data recovery tool and get your files back in a click.
You can decrypt a file online without a key if you have the right tool. Advanced Encryption Standard(AES) is a symmetric encryption algorithm. Following is the example of generating an AES encrypted password and decrypt an AES encrypted password.
You can decrypt the files system by unchecking the "Encrypt Contents to Secure Data" feature. But, this only works for the file system, not your specific file. If you want to decrypt files, the certificate or password is indispensable.
If you really need to decrypt files, many guides will advise you to try the online decryption tools. However, you need to be aware that these tools are not 100% safe. You may be at risk of data theft or source data corruption.
In addition to that, if users actively use tools to encrypt, there is another unexpected way of files being encrypted, which is by viruses or ransomware. For example, ransomware encrypts and deletes files. In the next part, we will show you how to use a reliable ransomware encrypted file recovery tool to get back data without paying the ransom.
Since most ransomware encrypts your files and folders by three steps: make an exact copy of files and folders > encrypt the copy > delete the source files. How this works gives you a great opportunity to recover the encrypted files through professional data recovery software.
Here, we highly recommend you try EaseUS Data Recovery Wizard. This virus attack data recovery program enables you to recover files infected by shortcut virus, restore files deleted and encrypted by ransomware like Locky, CryptoLocker, CryptoWall, and TorrentLocker, without paying.
Go ahead and download this capable data recovery tool and start to recover ransomware encrypted files within three steps. Note that this is just for file recovery of shortcut virus or ransomware, not including those by encryption tools.
EaseUS Data Recovery Wizard will immediately start a scan process to find your deleted or hidden files on the virus infected hard drive. To quickly locate the wanted files, you can use the Filter or type grouping feature to display only the pictures, videos, documents, emails, etc.
When the process finishes, you can preview the scanned files. Select the files you want and click the "Recover" button. You should save restored files to another secure location on your computer or storage device, not where they were lost.
We tend to protect privacy by using some file encryption tools, such as EFS (Encrypting File System), that provide the core file encryption technology used to store encrypted files on NTFS file system volumes. So, only with a certificate, people can access the EFS locked files.
You can use EFS or Bitlocker to encrypt your files and data. But, to avoid losing the password, key, or certificate and not being able to decrypt files, we suggest you back up your encryption certificates and keys to a safe location, and remember your EFS backup password.
For solving the encryption problem caused by ransomware, the most important thing is preventing the virus infection. Install and enable the anti-virus software on your computer. Moreover, back up important data and files on your computer regularly.
Note that full-disk encryption is still the best way to protect your system. A disk image will protect the data that you store on it -- but still leaves your swap file, history, and other temporary bits of data vulnerable.
We discovered a new malware family that we have dubbed PuppetLoader. It is a complex, five-stage malware family that uses some interesting techniques, including hijacking loaded modules to launch malicious code and hiding malicious payloads and modules in modified bitmap image (BMP) files.
BasicLoader searches for BMP files across directories in Users\\Public (Desktop, Documents, Downlaods, Music, Pictures, and Videos). It checks each directory for BMP files that would pass the required structure. For the BMP files that do, the payload appended to the BMP file is decrypted, loaded into memory, and executed. The BMP file is made up of only 33 x 11 pixels and 338 bytes, and the data appended to it is the payload that is encrypted with the same flawed RC4 implementation.
After this, the malware starts a system logger thread, where the logged information is received via a pipe and is saved to a file with a hard-coded name. The logged information can come from other modules or processes. Based on our analysis, each log file entry is separated by a separator (0xAABBCCDD), followed by a custom RC4 password and message length.
The code is structured in several classes that handle different tasks, such as managing the interactive shell, uploading and downloading files, installing new modules, monitoring victim behavior, and executing callback functions when conditions are met.
The oRAT droppers that we found in our analysis were a MiMi chat application built using the Electron JS framework and a DMG (disk image) file. We discuss the full details of both in our research paper.
The configuration is decrypted using the AES-GCM (AES with Galois/Counter Mode) algorithm. The malware then parses it and enables the gateway or traffic forwarder mode if it is specified in the configuration settings.
If the SMTemp.dat file exists, the Loader.dll file executes it. After that, the loader decrypts a legitimate Adobe Flash Player installer and executes it, in order to deceive the victim into thinking that the executable is a legitimate installer.
All of the samples we found are loaded in the same way: A legitimate and signed file that is vulnerable to DLL sideloading is placed alongside a malicious DLL, which decrypts and loads the third file containing the final payload.
The full technical details of our investigation can be found in our research paper, which we will publish soon. We list down the indicators of compromise (IOCs) for Windows, Linux, and macOS in separate text files. We also provide the domain list in a separate text file.
build.py is intended to be a top-level builder that combines bokor (OSXApple operating system kernel injection), darkmatter (EFIExtensible Firmware Interface persistence), and a sample OSXApple operating system bundle. It can be used to create a fully configurable DerStarke release or used to setup a building environment for darkmatter testing/development. Note that there is a debug.plist and release.plist that has default values for a fully debug or release options. Feel free to use these files, but it is not recommended to modify them in that other files used them to make release builds (make_release.sh). If you need to tweak specific options, use preconfig.plist, or rename to anything you like.
A lot of EFIExtensible Firmware Interface functionality can be testing without needing to modify bokor code or needed to be written down to flash. If the functionality can be tested by running the EFIExtensible Firmware Interface executable in an EFIExtensible Firmware Interface Shell, execute the top-level builder with the '-d' option and follow the instructions below. If you need to do full end to end testing or need to be in the flash, it's easier to just build a debug DerStarke release, and use the ISOInternational Standard Organization image to create a flashable thumb stick.
Darkmatter has a lot configuration values required to build an instance of darkmatter (initial values for things like enable time, guid values of it's NVRAMNon-volatile Random Access Memory variables, the file guid for files it uses, etc). These use to be separated out into individual files, but has been combined into one plist in version 2.0. Note that the default darkmatter.plist contains all required values for a build. scripts/build_config.py will auto generate the rest of the values (encryption keys, files guid, etc). An output of all values that the build of darkmatter used is located in out/dm_out.plist. If you require any of these values to be fixed when testing, you can modify the original darkmatter.plist.
A good example of wanting a fixed value that is normally auto generated would be the xxtea encryption key. If you are doing multiple builds of Loader.efi and running them at shell that uses an encrypted bundle loaded off the filesystem, you would have to copy both L.efi and bundle to your testing stick. If you fixed the xxtea key, you can use the same bundle on different builds of Loader. The easiest way to make sure you have the correct format would be to build once and copy the desired parameter from out/dm_out.plist (in this case it would be Root->General->Xxtea Key).
Once you're inside /externals/darkmatter, you will need to run setupudk.py before using the Makefile. AED/EDB's UDK build uses a disk image (UDK2010.UP4_DarkBuilder.dmg) to build all their EFIExtensible Firmware Interface binaries. setupudk.py will modify the necessary UDK files inside the diskimage and setup symlinks to the CWD with respects to the configuration (can view the config at top of setupudk.py). Since the location of the source code is symlink'd inside the disk image, you would have to run setupudk.py if you checked out two copies of darkmatter on disk and were switching between the two. 2ff7e9595c
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