How To Remove SynAck Virus Infections and Restore Your PC

How To Remove SynAck Virus Infections and Restore Your PC

SynAck virus is an advanced ransomware threat that has been identified in a targeted attack. The security analysis reveals that it contains potent features making it a one of the most dangerous new viruses. We anticipate that future versions of it will deploy a ransomware component as well.

Threat Summary

TypeRansomware, Cryptovirus
Short DescriptionThis is an advanced virus threat that can lead to many system changes and can launch different components depending on the exact configuration.
SymptomsUsers may experience performance issues, the inability to run certain programs or may find certain data inaccessible.
Distribution MethodSpam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by SynAck


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User ExperienceJoin Our Forum to Discuss SynAck.
Data Recovery ToolWindows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

SynAck Virus – Distribution Ways

The SynAck virus is an advanced strain of malware that has recently been uncovered. It uses a bypass technique that was discovered back in December 2017 that can override contemporary security mechanisms.

It is distributed using hidden embedded code in various files. A primary mechanism is the use of email spam messages that utilize various social engineering techniques. They are used to coerce the victim users into installing malware files that are either attached directly to the messages or hyperlinked in the body contents. In combination with this the operators behind the Synack virus can also use the emails for delivering malware payloads.

An example is the use of malware documents that contain embedded Synack virus code. They can be created in different types: text files, presentations or spreadsheets and when they are opened by the victims a notification prompt will appear asking them to enable the built-in code. If this is done the virus will be downloaded and executed on the affected computer. The other payload delivery type is the creation of malware software installers. In a similar way to the previous example the computer criminals embed the Synack code into application installers. Usually popular software such as utilities, creativity suites and computer games.

Other than email messages the criminals behind the threat may also be distributed to various sites including web scripts such as pop-ups, banners and redirects.

Synack virus infections can be caused by browser hijackers — malicious web browser plugins that are distributed on various outlets. They are often described as implementing new features that might be useful to the users. They are often made compatible with the most popular web browsers: Mozilla Firefox, Google Chrome, Opera, Safari, Microsoft Edge and Internet Explorer. Once they are deployed the associated engine will change the default options in order to direct the users to a certain hacker-operated site. Affected settings are the default home page, new tabs page and search engine. After this is done tracking technologies will be enabled and any additional malware (such as the Synack virus) deployed.

At the moment the attacks so far target companies and individual users located in Kuwait, USA, Iran and Germany.

SynAck Virus – In-Depth Analysis

The security analysis reveals that the first component is the stealth protection module. It uses a complex bypass technique that uses NTFS file system processes that lead to a binary obfuscated delivery. Before the attack is commenced the virus code is obfuscated and then compiled. This means that the malware payload is executed indirectly, rather individual components and systems of the main engine are loaded. As an after effect security applications and virus countermeasures are not able to pick it up based on signature scans. The analysis reveals that that the malware engine can kill any running processes that can interfere with its execution.

The next step is to perform a language check which checks the regional and language settings and compares them with the built-in list of countries. The exact mechanism is to list the installed keyboard layouts and check if they match with the built-in instructions.

SynAck continues further by instituting a brief pause of 300 seconds before continuing further. The virus engine performs a file system check that looks up the current directory and starts to execute any follow-up modules.

Depending on the attack campaign and the performed customizations additional modules can be loaded. Examples include Windows Registry modifications. They can impact any existing strings associated with user-installed applications or the operating system itself. In addition the virus engine may create its own specific entries. Modifications to any existing values may lead to the inability to launch certain functions or Windows services. Overeall operating system performance can also be affected.

The SynAck virus engine can also opt to delete the Shadow Volume Copies of identified data which makes data recovery more difficult. In such cases the victims need to use a professional-grade solution, refer to our instructions to learn more about this step. The computer hackers behind the malware can also instruct the engine to institute a persistent state of infection. If this is done the virus engine will be started every time the computer is booted. Any user actions that attempt to negate this will be countered.

Follow-up modules that can be run include a network connection with a hacker-controlled server. It can be used in a Trojan-like manner by reporting the infections to the criminals and receiving arbitrary commands. The hackers can use the SynAck virus infection to spy on the victims in real time, as well as take over control of the machines. To make recovery more difficult SynAck also deletes all associated log files.

Some of the SynAck strains were found to disallow encryption if the keyboard input settngs correspond to the following values: ECIES-XOR-HMAC-SHA1.

SynAck Virus – Encryption Process

The security report indicates that the virus engine is capable of crafting ransom messages either by using the standard practice of creating ransomware notes or another method. This particular threat has been found to create custom text to the Windows logon screen. This is possible via Windows Registry entries modification. The security analysis shows that the cipher is a customized mix of ECIES-XOR-HMAC-SHA1.

An example message reads the following:

SynAck FES

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

Even though the security analysis shows clear signs of ransomare behavior patterns so far we have not received reports of affected files. It is very possible that the actual ransomware component will be launched in future versions of the threat. We presume that the .SynAck file extension or a similar one will be used.

A ransomware note may be created in a file called ==READ==THIS==PLEASE==[8-char-random-ID].txt which reads the following message:

SynAck FES
(Files Encryption Softwre)

Dear client, we apoligize for inconvinience with your files.
So we make a business offer to order file recovery service from us.
We do not extort money, files restore is an optional service.
Also we will do auditing of your network FOR FREE if you order file recovery service.

Some details about SynAck- FES:
This software uses ecies-secp192r1 algorithm to create unique pair of private and public keys for the session.
Each file is encrypted with random keys using aes-ecb-256 algorithm.
We strongly recommend you not to use third-party decryptors because they can damage your files.
But if you want to try to restore your files by yourself, make sure you have made backup copies of encrypted files.
And please do not remove files with text notes, because they contain important information required for file restoring.

If you want to order file recovery service, please contact our support using one of the following e-mail addresses:

[email protected]
[email protected]

If you have not get a response in 24 hours, please do not panic and write on BitMessage (using site

Keep in mind that there are fake services offering decryption; do not believe them or you will lose your money.
Anyway, there is one method you can use for proof: ask to decrypt some files for free.
No one excpet us will be able to do that.



SynAck virus ransom note

Remove SynAck Virus and Restore .SynAck Files

If your computer system got infected with the SynAck ransomware virus, you should have a bit of experience in removing malware. You should get rid of this ransomware as quickly as possible before it can have the chance to spread further and infect other computers. You should remove the ransomware and follow the step-by-step instructions guide provided below.

Martin Beltov

Martin graduated with a degree in Publishing from Sofia University. As a cyber security enthusiast he enjoys writing about the latest threats and mechanisms of intrusion.

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