'.guesswho File Extension' Ransomware

'.guesswho File Extension' Ransomware Description

The ".guesswho File Extension" Ransomware is a file encoder Trojan that was detected on April 24th, 2019. It infects all versions of the Windows operating system. ".guesswho File Extension" Ransomware Trojan appears to land on computers when users open harmful Microsoft Word documents received by email, but it can also get installed through malicious links, torrent files, porn websites, p2p file sharing, cracked software, and many other ways. This ransomware behaves like regular encryption malware and features a small size, which makes it hard for computer security experts to link it to already known ransomware families. Most ransomware samples from 2018 and 2019 are made on ransomware builders, and it is hard to distinguish them. Moreover, one threat actor can use multiple ransomware builders.

Yet, the latest research points that ".guesswho File Extension" Ransomware can be linked to the Rapid Ransomware family which is known to use AES and RSA encryption algorithms and to append the following extensions to encrypted files: ".mouse", ".no_more_ransom," ".nano," ".guesswho," ".ezymn," ".GILLETTE," and ".rpd.[5-random-characters]." Victims of these ransomware variants have been located in Iran, USA, Malaysia, Germany, Japan, South Korea, Indonesia, Spain, and other countries. This malware family requires the payment of the ransom in Bitcoin, whereby one of the examined samples asked for the equivalent of $3,000 in exchange for the decryption key. This particular threat also gave a 50% discount to users who pay within 72 hours after file encryption.

".Guesswho File Extension" Ransom Note Links It to Another Malware Family

The ".guesswho File Extension" Ransomware is known to append the ".guesswho" extension to locked files and to show a ransom note called "How Recovery Files.txt" to users that says:

'Hello, dear friend!
All your files have been ENCRYPTED
Do you really want to restore your files?
Write to our email – rapidka@cock.li or notnepo@cock.lu
and tell us your unique ID – ID-[8 random characters]'

Comparing the message shown above to already known threats only leads to more questions and links the malware to other similar threats. The notification generated by ".guesswho File Extension" Ransomware is the same as those generated by the RPD Ransomware and the PainLocker Ransomware. The last two ransomware threats belong to different malware families — the Everbe Ransomware and the Rapid Ransomware. Hence, classifying the ".guesswho File Extension" Ransomware is rather troublesome. Affected users can't access photos, downloaded images, MP3s, MP4s from the Internet, as well as documents on their disks.

The exact encryption method employed by ".guesswho File Extension" has not been sufficiently researched yet, however, it is known that the ransomware creates an individual decryption key for each victim and that it is absolutely not possible to recover the corrupted files without this key. Like most other ransomware threats, this one also deletes all shadow copies of the locked files in order to prevent their recovery, while victims cannot access the key as it is kept on a server controlled by the threat actors.

".Guesswho File Extension" Ransomware Has More Dangerous Capabilities

In addition to the file-encrypting module, ".guesswho File Extension" Ransomware also acts as a browser hijacker and data stealer. It installs silently its own malicious plug-ins, add-ons, and other dangerous codes to the victim’s browser, modifying thus the browser setting and setting up redirects to third-party websites whose primary goal is to promote sponsored links and products and to boost web traffic artificially. Furthermore, ".guesswho File Extension" Ransomware can open a backdoor on infected systems, allowing thus remote access to potential attackers. Another hidden capability of this threat is to steal sensitive user data that can later be misused by scammers. Overall, ".guesswho File Extension" Ransomware deteriorates the performance of the affected devices as it consumes system resources and makes important files inaccessible.

Manual Removal Is Not Recommended

We do not recommend trying to remove this ransomware manually, especially if you are an inexperienced user. ".guesswho File Extension" Ransomware installs its malicious scripts and files on different locations within the entire operating system, so manual removal can be very complicated and time-consuming. The ransomware creates its own entries in the Windows Registry, its malicious process can be observed in the Task Manager, and some programs related to the malware can also be detected in the list of the Programs installed on the PC. Some of the registry entries that belong to ".guesswho File Extension" Ransomware are:

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\msseces.exe "Debugger" = 'svchost.exe'
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings "WarnOnHTTPSToHTTPRedirect" = '0'
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\'.guesswho File Extension' Ransomware
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\msascui.exe "Debugger" = '.guesswho File Extension' Ransomware
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings "WarnOnHTTPSToHTTPRedirect" = '0'
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore "DisableSR " = '1'
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "xas"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ekrn.exe "Debugger" = '.guesswho File Extension' Ransomware
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "3948550101"
  • HKEY_CURRENT_USER\Software\'.guesswho File Extension' Ransomware

We also do not recommend contacting the attackers via "rapidka@cock.li," "notnepo@cock.lu," or any other email address provided by the malware actors. Data from August 2019 shows that the operators of ".guesswho File Extension" Ransomware have used some new email addresses for the communication with the victims, like grupposupp@airmail.cc, grupposupp@protonmail.ch, directreserve@airmail.cc, and mail@rapid2019.com.

Paying money to the ".guesswho File Extension" Ransomware team may not suffice, and you may lose your data still. You should try to use a backup tool and cloud service when restoring your data. Clean the compromised devices using a credible malware removal tool.

Do You Suspect Your PC May Be Infected with '.guesswho File Extension' Ransomware & Other Threats? Scan Your PC with SpyHunter

SpyHunter is a powerful malware remediation and protection tool designed to help provide PC users with in-depth system security analysis, detection and removal of a wide range of threats like '.guesswho File Extension' Ransomware as well as a one-on-one tech support service. Download SpyHunter's FREE Malware Remover
Note: SpyHunter's scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read more on SpyHunter. Free Remover allows you to run a one-off scan and receive, subject to a 48-hour waiting period, one remediation and removal. Free Remover subject to promotional details and Special Promotion Terms. To understand our policies, please also review our EULA, Privacy Policy and Threat Assessment Criteria. If you no longer wish to have SpyHunter installed on your computer, follow these steps to uninstall SpyHunter.

Security Doesn't Let You Download SpyHunter or Access the Internet?

Solutions: Your computer may have malware hiding in memory that prevents any program, including SpyHunter, from executing on your computer. Follow to download SpyHunter and gain access to the Internet:
  • Use an alternative browser. Malware may disable your browser. If you're using IE, for example, and having problems downloading SpyHunter, you should open Firefox, Chrome or Safari browser instead.
  • Use a removable media. Download SpyHunter on another clean computer, burn it to a USB flash drive, DVD/CD, or any preferred removable media, then install it on your infected computer and run SpyHunter's malware scanner.
  • Start Windows in Safe Mode. If you can not access your Window's desktop, reboot your computer in "Safe Mode with Networking" and install SpyHunter in Safe Mode.
  • IE Users: Disable proxy server for Internet Explorer to browse the web with Internet Explorer or update your anti-spyware program. Malware modifies your Windows settings to use a proxy server to prevent you from browsing the web with IE.
If you still can't install SpyHunter? View other possible causes of installation issues.

Site Disclaimer

Enigmasoftware.com is not associated, affiliated, sponsored or owned by the malware creators or distributors mentioned on this article. This article should NOT be mistaken or confused in being associated in any way with the promotion or endorsement of malware. Our intent is to provide information that will educate computer users on how to detect, and ultimately remove, malware from their PC with the help of SpyHunter and/or manual removal instructions provided on this article.

This article is provided "as is" and to be used for educational information purposes only. By following any instructions on this article, you agree to be bound by the disclaimer. We make no guarantees that this article will help you completely remove the malware threats on your PC. Spyware changes regularly; therefore, it is difficult to fully clean an infected machine through manual means.

Leave a Reply

Please DO NOT use this comment system for support or billing questions. For SpyHunter technical support requests, please contact our technical support team directly by opening a customer support ticket via your SpyHunter. For billing issues, please refer to our "Billing Questions or Problems?" page. For general inquiries (complaints, legal, press, marketing, copyright), visit our "Inquiries and Feedback" page.