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Discovered: April 28, 2015
Updated: August 29, 2016 8:35:18 PM
Type: Trojan
Infection Length: Varies
Systems Affected: Windows

Ransom.Kriptovor is a Trojan horse that encrypts files on the compromised computer. It then demands that the user pays a ransom in order to decrypt the files.

Note: Definitions prior to August, 2016 may detect this threat as Trojan.Cryptolocker.R

Antivirus Protection Dates

  • Initial Rapid Release version April 28, 2015 revision 017
  • Latest Rapid Release version April 26, 2018 revision 032
  • Initial Daily Certified version April 28, 2015 revision 035
  • Latest Daily Certified version April 27, 2018 revision 003
  • Initial Weekly Certified release date April 29, 2015

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Technical Description

Once executed, the Trojan scans the compromised computer for the following process names to determine if it is being analyzed:

  • wireshark.exe
  • idaq.exe
  • idag.exe
  • ollydbg.exe
  • idag64.exe
  • pexplorer.exe
  • lordpe.exe
  • hiew32.exe
  • bindiff.exe
  • procexp.exe

The Trojan scans the computer for the following registry subkeys to determine if it is running on a virtual machine:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Sandboxie

The Trojan scans the computer for the following computer names to determine if it is running in a malware analysis environment:
  • XP3-HOST01
  • 17-TESTXP
  • MWS01
  • MWS02
  • MWS03

If the Trojan finds any of the previously mentioned process names, registry subkeys, or computer names, it will quit.

The Trojan looks for an internet connection by contacting the following location:
  • www.adobe.com

The Trojan obtains the IP address of the compromised computer by contacting the following location:
  • checkip.dyndns.org

The Trojan creates the following file to remove all .exe files inside the directory:
  • %UserProfile%\Thumbsdb.bat

The Trojan then deletes the following file:
  • %UserProfile%\Thumbsdb.bat

The Trojan checks for the presence of the following mutex:
  • gordon

If the Trojan finds the gordon mutex, it quits. If the Trojan does not find the gordon mutex, it creates it.

The Trojan runs the following commands with ShellExecute to prevent the compromised computer from going on standby or sleeping while the Trojan encrypts files:
  • powercfg.exe -x -standby-timeout-ac 0
  • powercfg.exe -x -standby-timeout-dc 0
  • powercfg.exe -x -hibernate-timeout-ac 0
  • powercfg.exe -x -hibernate-timeout-dc 0

The Trojan runs the following command to delete all shadow copies on the compromised computer to prevent it from being restored to a previous state:
  • vssadmin.exe Delete Shadows /All /Quiet

The Trojan sends an email from sales@valanoice.org to kolin@valanoice.org with the following information about the compromised computer:
  • Computer name
  • IP address

The Trojan then encrypts files with the following extensions on the compromised computer:
  • .prefab
  • .emd
  • .efn
  • .efb
  • .epf
  • .md
  • .lgp
  • .erf
  • .dt
  • .1cd
  • .kdbx
  • .kdb
  • .sqlitedb
  • .sqlite3
  • .sqlite
  • .sql
  • .mdf
  • .mxl
  • .mdb
  • .eql
  • .edb
  • .dxl
  • .dbt
  • .dbf
  • .dbx
  • .dbc
  • .adp
  • .accdc
  • .ldf
  • .accdb
  • .snk
  • .shy
  • .sef
  • .rzx
  • .rzk
  • .enc
  • .bsk
  • .bpk
  • .bfa
  • .afp
  • .rev
  • .rar
  • .7z
  • .zipx
  • .zip
  • .dxe
  • .dws
  • .dwg
  • .pcx
  • .psb
  • .psd
  • .oab
  • .pab
  • .fp3
  • .fg
  • .fcz
  • .fc2
  • .egg
  • .dwf
  • .tbb
  • .eml
  • .key
  • .xof
  • .xcf
  • .tbn
  • .cfn
  • .cf
  • .raw
  • .pov
  • .ply
  • .jpf
  • .jiff
  • .jif
  • .png
  • .jpeg
  • .jpg
  • .jpe
  • .cdr
  • .txt
  • .ppsx
  • .pptx
  • .ppt
  • .xlsm
  • .xlsx
  • .xls
  • .rtf
  • .docm
  • .docx
  • .doc
  • .pdf
  • .tiff
  • .tif
  • .fb2
  • .fb
  • .pfx
  • .p7b
  • .crt
  • .stl
  • .der
  • .djvu
  • .csr
  • .cer
  • .sec
  • .sgn
  • .pem
  • .p7c
  • .p7
  • .mht
  • .html
  • .htm
  • .jbc
  • .pst
  • .ebd

Note: Files encrypted by the Trojan will have the file extension changed to the following:
  • .just

The Trojan creates the following file in each directory where it encrypts files:
  • MESSAGE.txt

The MESSAGE.txt file contains a ransom message informing the user that their files have been encrypted. The message also provides information on how the files can be decrypted for a fee.


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.


You may have arrived at this page either because you have been alerted by your Symantec product about this risk, or you are concerned that your computer has been affected by this risk.

Before proceeding further we recommend that you run a full system scan . If that does not resolve the problem you can try one of the options available below.

If you are a Norton product user, we recommend you try the following resources to remove this risk.

Removal Tool

If you have an infected Windows system file, you may need to replace it using the Windows installation CD .

How to reduce the risk of infection
The following resources provide further information and best practices to help reduce the risk of infection.

If you are a Symantec business product user, we recommend you try the following resources to remove this risk.

Identifying and submitting suspect files
Submitting suspicious files to Symantec allows us to ensure that our protection capabilities keep up with the ever-changing threat landscape. Submitted files are analyzed by Symantec Security Response and, where necessary, updated definitions are immediately distributed through LiveUpdate™ to all Symantec end points. This ensures that other computers nearby are protected from attack. The following resources may help in identifying suspicious files for submission to Symantec.

Removal Tool

If you have an infected Windows system file, you may need to replace it using the Windows installation CD .

How to reduce the risk of infection
The following resource provides further information and best practices to help reduce the risk of infection.
Protecting your business network

The following instructions pertain to all current Symantec antivirus products.

1. Performing a full system scan
How to run a full system scan using your Symantec product

2. Restoring settings in the registry
Many risks make modifications to the registry, which could impact the functionality or performance of the compromised computer. While many of these modifications can be restored through various Windows components, it may be necessary to edit the registry. See in the Technical Details of this writeup for information about which registry keys were created or modified. Delete registry subkeys and entries created by the risk and return all modified registry entries to their previous values.

Writeup By: Roberto Sponchioni