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DriedSister ransomware. How to remove? (Uninstall guide)

removal by Ugnius Kiguolis - - | Type: Ransomware

DriedSister – Japanese ransomware that doesn’t demand a ransom

Illustrating DriedSister ransomware

DriedSister is a crypto-ransomware[1] that has been detected at the beginning of February 2018. Ransomware researchers revealed a close relationship between this ransomware and Himouto Umaru-chan, which is why it is also dubbed as Umaru ransomware. The virus uses AES cryptography to lock MS Office documents, OpenOffice, PDF, text files, databases, photos, music, video, image files, archives, and other file types. In particular, it targets personal files that start with “-recover” argument. All files encrypted by DriedSister virus get a .干物妹!file extension, so initially named file document1.doc would look like document1.doc.干物妹!after the encryption.

The original name of the DriedSister ransomware virus is下 物 妹, which in English sounds like “Irisimo imoto.” Intersting fact about the name of the virus is that the phrase 下 物 妹 refers to a woman who has given up on love and is kind of self-indulgent. In case of this ransomware, 女woman has been replaced with 妹sister.

DriedSister ransomware does not drop a ransom note. It does not demand a ransom at all, which is why it’s not a regular crypto-ransomware so far. Although it does generate a supposed-to-be ransom note with a title in Japanese干 物 妹! 身 代金 ウ イ ル ル:, the file does not contain valuable information about DriedSister decryptor.

Initially, the virus is oriented towards Japanese users, but that does not ensure that its prevalence won’t expand worldwide. At the moment of writing, it’s not clear how many people fallen victims to this ransomware. However, it’s clear that the virus is not decryptable. The key is hard-coded, but since victims do not seek for a ransom, they did not develop a paid decryptor, at least not yet. The only way to continue using the PC is to remove DriedSister virus completely. The only way to do that is to run a thorough system scan with Reimage, Malwarebytes, Plumbytes Anti-MalwareNorton Internet Security or another professional anti-virus. After that, there’s a handful of methods that can help to decrypt files encrypted by DriedSister ransomware. You can find all of them down below this article.

By the way, VirusTotal analysis[2] revealed that the only 35 AV engines out of 67 are capable of recognizing this ransomware. Therefore, make sure to select a professional anti-virus tool to remove DriedSister virus.

Spam email remains the primary technique used for ransomware distribution

There are many different strategies that hackers use for ransomware distribution. These are the most popular methods currently used:

  • Peer to peer (P2P) network sharing;
  • Free software downloads;
  • Spam e-mails;
  • Fake software updates;
  • Intrusive ads;
  • Malicious Websites.

Apart from the multiplicity of dissemination methods, the spam email[3] remains the most way that transmits the bulk of ransomware virus. People get professionally-looking emails, which may be generated by various authorities. Such email contains PDF, .doc, .txt, and similar attachments, which may be indicated as the check, bill, certificate or what not.
If the user opens the attachment, ransomware is being executed, and all personal files are encrypted in no time. In this case, the ransomware activates the ransomware.exe file.

As pointed out by security specialists from,[4] to protect the system from ransomware attacks, it‘s important to be careful with P2P networks and free download websites. They may also be used for distribution of malware. Besides, be careful with fake software updates claiming that your system is at risk and that the update is crucial to prevent data loss or information leakage. Such updates may also execute malicious code, so be careful and bypass all suspicious pop-up ads.

Finally, do not open emails that seem suspicious to you. If the sender does not know or you find some type/grammar mistakes, stay away from the attachment. Report such email message as spam and delete it immediately.

Get rid of DriedSister malware

DriedSister removal is hardly possible without professional malware removal software. Crypto-ransomware viruses install multiple files all over system’s folders, so detecting and removing them manually is not possible. Therefore, to remove DriedSister ransomware virus, we would recommend using Reimage.

If malware blocks any security program you want to enable, which is why you can’t eliminate DriedSister virus, you should follow the steps given below:

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To remove DriedSister virus, follow these steps:

Remove DriedSister using Safe Mode with Networking

If malware blocks your anti-virus, you may need to reboot your PC to Safe Mode with Networking:

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove DriedSister

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete DriedSister removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove DriedSister using System Restore

If the previous method did not help, try these steps to launch your antivirus:

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of DriedSister. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that DriedSister removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove DriedSister from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by security experts.

If your files are encrypted by DriedSister, you can use several methods to restore them:

Data Recovery Pro – a tool to recover files with .干物妹!extension

Since currently there's no DriedSister decryptor found, you can find alternative decryption methods like Data Recovery Pro:

  • Download Data Recovery Pro;
  • Follow the steps of Data Recovery Setup and install the program on your computer;
  • Launch it and scan your computer for files encrypted by DriedSister ransomware;
  • Restore them.

Windows Previous Versions feature can help you to unlock the most important files

If you had only few important files that has been locked, you should try to recover them by enabling Windows Previous Version:

  • Find an encrypted file you need to restore and right-click on it;
  • Select “Properties” and go to “Previous versions” tab;
  • Here, check each of available copies of the file in “Folder versions”. You should select the version you want to recover and click “Restore”.

Recovery files from Volume Shadow Copies

Volume Shadow Copies are stored on each system by default. However, most of ransomware viruses delete those copies leaving their victims helpless. The only way to check that is to follow these steps:

  • Download Shadow Explorer (;
  • Follow a Shadow Explorer Setup Wizard and install this application on your computer;
  • Launch the program and go through the drop down menu on the top left corner to select the disk of your encrypted data. Check what folders are there;
  • Right-click on the folder you want to restore and select “Export”. You can also select where you want it to be stored.

DriedSister decryptor is not yet available

About the author

Ugnius Kiguolis
Ugnius Kiguolis - The mastermind

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