A ransomware infection has been detected in association with malicious e-mail spam sent out to users to infect their computers. The virus encrypts the files on compromised machines. The encrypted files contain a very specific file extension to them – .grt. After the encryption process has completed, the ransomware infection may drop a ransom note to notify the victims that they have to pay a hefty ransom fee to get the encrypted files recovered. In case you have become a victim of the .grt file virus, reccomendations are to read this article about Karmen thoroughly.
|Short Description||The malware encrypts users files using a strong encryption algorithm, making direct decryption possible only via a unique decryption key available to the cyber-criminals.|
|Symptoms||The user may witness ransom notes and “instructions” linking to a web page and a decryptor. Changed file names and the file-extension .grt has been used.|
|Detection Tool|| See If Your System Has Been Affected by .grt Virus |
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|User Experience||Join our forum to Discuss .grt Virus.|
|Data Recovery Tool||Windows 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.|
Karmen .grt Ransomware – How Does It Infect
The infection process of Karmen ransomware is rather typical than unique. It may perform e-mail spam techniques via specific spamming software to send out e-mail spam to unsuspecting victims. Usually this spam is conducted in waves and fake accounts are used with several templates for spam messages. The templates themselves may include fake e-mails for a delivery via post, fake PayPal purchase, non-existent suspicious bank account activity and other deceptive notifications. The end goal is to get the user to either click on a malicious e-mail attachment or to click on a web link and become infected.
Other forms of malware replication also include the spreading of fake installers, fake patches and applications. Such may be spread on various websites that host torrents or simply pretend to be legitimate.
Karmen .grt Ransomware – More Information
Once a user is infected with the .grt variant of Karmen ransomware, the computer begins to behave strange and may freeze for one moment. This is because Karmen ransomware may perform series of activities on the compromised machine. The first one of them is to connect to a command and control server and download the malicious files of .grt Ransomware. One of the files is named joise.exe, but there are multiple support modules besides it. The files may be dropped on the following Windows directories under different names:
After the payload of this ransomware infection has been dropped on the user PC, the virus begins to modify different system settings. One of those is to insert commands as an administrator in the Windows Command Prompt in the background. These inserted commands may be the bcedit and vssadmin commands, focused primarily on deleting shadow copies and backups on Windows machines. The vssadmin may be input in different forms of the command below:
After this has been done, the .grt virus may also modify different Windows Registry sub-keys. One of the usually targeted ones are the Run and RunOnce keys which are responsible for running a file when Windows boots:
In addition to this, the ransomware may also display fake system errors and other message or cause the system to restart.
Karmen .grt File Virus – The Encryption
For the encryption of this ransomware to work, it may use a specific module for that which is configured to run in an obfuscated manner i.e. without being detected. The encryption activity attacks files that are often used and should be of importance to the user and makes these files no longer openable after it is complete. The files attacked may be of the following file types:
→ “PNG .PSD .PSPIMAGE .TGA .THM .TIF .TIFF .YUV .AI .EPS .PS .SVG .INDD .PCT .PDF .XLR .XLS .XLSX .ACCDB .DB .DBF .MDB .PDB .SQL .APK .APP .BAT .CGI .COM .EXE .GADGET .JAR .PIF .WSF .DEM .GAM .NES .ROM .SAV CAD Files .DWG .DXF GIS Files .GPX .KML .KMZ .ASP .ASPX .CER .CFM .CSR .CSS .HTM .HTML .JS .JSP .PHP .RSS .XHTML. DOC .DOCX .LOG .MSG .ODT .PAGES .RTF .TEX .TXT .WPD .WPS .CSV .DAT .GED .KEY .KEYCHAIN .PPS .PPT .PPTX ..INI .PRF Encoded Files .HQX .MIM .UUE .7Z .CBR .DEB .GZ .PKG .RAR .RPM .SITX .TAR.GZ .ZIP .ZIPX .BIN .CUE .DMG .ISO .MDF .TOAST .VCD SDF .TAR .TAX2014 .TAX2015 .VCF .XML Audio Files .AIF .IFF .M3U .M4A .MID .MP3 .MPA .WAV .WMA Video Files .3G2 .3GP .ASF .AVI .FLV .M4V .MOV .MP4 .MPG .RM .SRT .SWF .VOB .WMV 3D .3DM .3DS .MAX .OBJ R.BMP .DDS .GIF .JPG ..CRX .PLUGIN .FNT .FON .OTF .TTF .CAB .CPL .CUR .DESKTHEMEPACK .DLL .DMP .DRV .ICNS .ICO .LNK .SYS .CFG”Source:fileinfo.com
After the encryption procedure has been completed, the virus appends the same file extension to all the encoded files and they look like the following:
Remove Karmen Ransomware and Restore .grt Encrypted Files
For the removal of this virus, you will most likely need to backup your files first, just in case. Then we advise you to follow the removal instructions below. They are carefully designed to help with the removal of this ransomware infection from your computer. In case you lack the experience in ransomware removal, recommendations are to use a specific anti-malware software which will not only take care of the removal at a click of a button but will also ensure future protection.
After you have removed Karmen ransomware from your computer, recommendations are to focus on trying out our suggested alternative methods in step “2. Restore files encrypted by .grt Virus” below.