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Remove SynAck ransomware / virus (Virus Removal Guide) - May 2018 update

removal by Ugnius Kiguolis - - | Type: Ransomware

SynAck ransomware is a sophisticated virus that targets businesses all over the world

SynAck ransomware virus spreads worldwide

SynAck (also known as Syn Ack) ransomware[1] is a crypto-virus that started attacking victims' computers in September 2017. Since then, four variants of this cyber infection appeared. The latest version is quite significant in cybersecurity world, as it is the first ransomware to use Process Doppelgänging technique to infect PCs and evade security software detection. While this process is not completely new (it has been first presented in December 2017 at the BlackHat conference), it is, however, the first time it is used for a ransomware attack.

Name SynAck
Type Ransomware 
Algorithms used  ECC-SECP192R1 & AES-ECB-256
First spotted  September 2017
Number of versions 4
Latest version features Uses sophisticated Process Doppelgänging technique to evade detection
Infiltration Spam emails, unprotected RDP configuration, malicious downloads, etc.
Elimination Automatic only: download and install Reimage Reimage Cleaner Intego or SpyHunter 5Combo Cleaner

The purpose of the ransomware is the same as of many other viruses (such as Scarab, GandCrab 3, Dharma, etc.) – to encrypt files and demand ransom for data release. The virus drops a ransom note called RESTORE_INFO-[id].txt on the desktop to explain to users what to do to get files back. SynAck uses ECC-SECP192R1 & AES-ECB-256 encryption algorithms, which makes it impossible to decrypt files unless a unique decryption key is used (hackers store it on a remote server).

Different SynAck virus versions provide slightly different information in the ransom notes. Each version presents contact details so that the victim could get in touch with the criminals:

  • The first SynAck version suggests writing to,,, or and leaves BM-2cTp9eosgjWs8SV14kYCDzPN3HJkwYk1LQ BitMessage ID as an alternate way of contacting criminals;
  • The second ransomware version provides email and a different BitMessage ID: BM-2cStoatQC4mDNWDHAoo2C1nYZJXhDsjCLj;
  • The third SynAck malware version suggests writing to or BM-2cWsgWxq1X5M6qjDEBPvCdEbbPLn2zi43k via BitMessage;
  • The latest version, SynAck FES asks victims to email or and offers to contact criminals via BM-2cTp9eosgjWs8SV14kYCDzPN3HJkwYk1LQ via BitMessage, in case there is no reply within 24 hours.

According to victims’ reports, the SynAck developers can ask as much as $2100 in Bitcoin for data recovery service. Unfortunately, the wallet associated with the virus currently holds over 98 Bitcoins, which means that criminals have collected a lot of ransoms already. You shouldn’t pay them – this only motivates them to keep updating and improving their illegal operations.

The virus doesn’t use the same extension to mark victim’s files – instead, it generates an individual set of ten random characters per file and appends it after the original file extension.

SynAck ransomware virusSynAck ransomware virus comes in three different versions. Each of them suggests writing to cybercriminals either via email or BitMessage.

It is highly advisable to remove SynAck virus as soon as you notice its presence on your computer. Please remember that removing the virus won’t recover your files – you have to have a data backup in order to do it. However, programs like Reimage Reimage Cleaner Intego or SpyHunter 5Combo Cleaner can not only eliminate the ransomware but also restore corrupted Windows system files that may have been destructed during the cyber attack.

We do not suggest trying to perform manual SynAck removal because the virus is simply too sophisticated to be deleted by inexperienced computer users. Besides, you must check whether the ransomware was the only virus that entered your computer, so a full computer scan is highly recommended.

The newest version of SynAck tries to avoid detection and analysis by using Doppelgänging Process

According to Kaspersky Lab,[2] The newest version of SynAck uses an intricate technique (Process Doppelgänging) to avoid detection and analysis. This method allows the virus to use NTFS transactions to start a malignant process from the transacted file, making the malicious process look like a genuine one, as well as helping to avoid security software detection.

The virus also prevents automatic sandbox analysts by checking the directory it executes from. SynAck will not proceed if it detects an attempt of launch from “wrong” directory, and exit the process instead.

After infiltration, malware can display a ransom note directly from Windows login screen by modifying LegalNoticeCaption and LegalNoticeText Registry Keys. It states the following:

Hello. Your files are encrypted. To restore files, please contact us by e-mail: or

An interesting fact about this version of the virus is that it avoids targeting users from Russia, Belarus, Ukraine, Georgia, Tajikistan, Kazakhstan, and Uzbekistan. The malware consists of a hard-coded list of keyboard layouts, which allows it to compare it to the one present on the targeted PC. If one of the layouts matches SynAck's one, the virus simply stays idle for 300 seconds and then calls ExitProcess, avoiding file encryption. Ransomware actively targets users from United States, Kuwait, Germany, and Iran instead.

SynAck crypto-virus

Users report Syn Ack distribution via RDP configuration

SynAck ransomware seems to be distributed via RDP attacks[3]. Criminals are trying to brute-force their way into victim’s computers or computer networks. This way, the virus can quickly compromise enterprise networks and demand huge ransoms for data recovery tools.

On top of that, the malware might be distributed using other means such as malvertising, malicious spam, and similar techniques. The continuous movement of Bitcoins in the aforementioned Bitcoin wallet gives us a reason to believe that the malicious software might be provided as ransomware-as-a-service, meaning that any criminal can join the affiliate program and help to distribute the virus further.

Keeping your anti-malware software up-to-date, creating a data backup and enabling automatic software updates is what can help you to prevent a ransomware attack. Do not forget to use powerful passwords on Remote Desktop Connection accounts, too.

Experts report that the described ransomware strongly affected U.S., France, Belgium and Netherlands[4].

SynAck ransomware uses Doppelgänging technique

Get rid of SynAck ransomware using security software

It is highly advisable to use professional malware removal software to remove SynAck virus. It is not a typical computer program, and you can’t uninstall it via Control Panel using its uninstaller.

To perform a successful SynAck removal, employ a software like Reimage Reimage Cleaner Intego or Malwarebytes. You might need to restart your PC in a particular mode if the security software fails to start in the normal regime (it means that the malware is trying to block your attempts to identify and remove the virus).

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Compatible with Microsoft Windows Supported versions Compatible with OS X Supported versions
What to do if failed?
If you failed to remove virus damage using Reimage Intego, submit a question to our support team and provide as much details as possible.
Reimage Intego has a free limited scanner. Reimage Intego offers more through scan when you purchase its full version. When free scanner detects issues, you can fix them using free manual repairs or you can decide to purchase the full version in order to fix them automatically.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Reimage, try running SpyHunter 5.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Intego, try running Combo Cleaner.

To remove SynAck virus, follow these steps:

Remove SynAck using Safe Mode with Networking

Prepare your PC for SynAck removal – reboot it into Safe Mode with Networking. Once the computer is ready, run your anti-spyware or anti-malware program to detect and eliminate malicious files.

  • 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 SynAck

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

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

Remove SynAck using System Restore

  • 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 SynAck. 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 Reimage Cleaner Intego and make sure that SynAck removal is performed successfully.

Bonus: Recover your data

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

You can restore files from a backup, however, if you do not have it, it will be much harder to recover your data. You may want to try one of the described methods:

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

Test Data Recovery Pro

One of the most efficient data recovery tools available today is Data Recovery Pro. You might want to try it and see if it manages to recover some files encrypted by SynAck.

  • 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 SynAck ransomware;
  • Restore them.

ShadowExplore software may help

It is very likely that the ransomware deleted Volume Shadow Copies that are required for ShadowExplorer software to work. However, it can't hurt to try:

  • 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.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from SynAck and other ransomwares, use a reputable anti-spyware, such as Reimage Reimage Cleaner Intego, SpyHunter 5Combo Cleaner or Malwarebytes

Do not let government spy on you

The government has many issues in regards to tracking users' data and spying on citizens, so you should take this into consideration and learn more about shady information gathering practices. Avoid any unwanted government tracking or spying by going totally anonymous on the internet. 

You can choose a different location when you go online and access any material you want without particular content restrictions. You can easily enjoy internet connection without any risks of being hacked by using Private Internet Access VPN.

Control the information that can be accessed by government any other unwanted party and surf online without being spied on. Even if you are not involved in illegal activities or trust your selection of services, platforms, be suspicious for your own security and take precautionary measures by using the VPN service.

Backup files for the later use, in case of the malware attack

Computer users can suffer from data losses due to cyber infections or their own faulty doings. Ransomware can encrypt and hold files hostage, while unforeseen power cuts might cause a loss of important documents. If you have proper up-to-date backups, you can easily recover after such an incident and get back to work. It is also equally important to update backups on a regular basis so that the newest information remains intact – you can set this process to be performed automatically.

When you have the previous version of every important document or project you can avoid frustration and breakdowns. It comes in handy when malware strikes out of nowhere. Use Data Recovery Pro for the data restoration process.

About the author
Ugnius Kiguolis
Ugnius Kiguolis - The mastermind

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