Welcome to Bleeping Computer.CryptoWall 4.0
leaves ransom notes named HELP_YOUR_FILES.TXT, HELP_YOUR_FILES.HTML and HELP_YOUR_FILES.PNG and will encrypt the actual filename of an encrypted file as well as the data contained in it. Each encrypted file will have a unique name with random characters (0ausbffwh.p5, 72lcvn.iv6nn, x83o8x.ux7, etc). CryptoWall 4.0 uses a .JS file to download and execute a file from the %temp% folder. The initial installer injects the program that actually encrypts data into explorer.exe/svchost.exe. There is more information in this BC news article...
Many crypto ransomware variants are typically programmed to automatically remove the malicious files responsible for the infection after the encrypting is done since they are no longer needed. However, if another piece of malware was responsible for installing it, then that could still be present if your antivirus did not detect and remove it.What should you do when you discover your computer is infected with CryptoWall
f you discover that your computer is infected with CryptoWall you should immediately scan your computer with an anti-virus or anti-malware program. Unfortunately, most people do not realize CryptoWall is on their computer until it displays the ransom note and your files have already been encrypted. The scans, though, will at least detect and remove any other malware that may have been installed along with CryptoWall.
Scanning with Malwarebytes Anti-Malware in safe mode will work but removal functions are not as powerful in safe mode
. Malwarebytes is designed to be at full power when malware is running
so safe mode is not necessary when using it. In fact, Malwarebytes loses some effectiveness for detection and removal when used in safe mode
because the program includes a special driver which does not work in safe mode. Further, scanning in safe mode prevents some types of malware from running so it may be missed during the detection process. Additionally, there are various types of malware infections which target the safeboot keyset so booting into safe mode is not always possible. For optimal removal, normal mode is recommended
so it does not limit the abilities of Malwarebytes. Doing a safe mode scan should only
be done when a regular mode scan fails or you cannot boot up normally. If that is the case, after completing a safe mode scan, rebooting normally, updating the database definitions and rescanning again is recommended.
If you need individual assistance with malware infection, follow the instructions in the Malware Removal and Log Section Preparation Guide
. When you have done that, start a new topic and post your logs in the Virus, Trojan, Spyware, and Malware Removal Logs forum
, NOT here
, for assistance by the Malware Response Team.
There is also an ongoing discussion in this topic where you can ask questions and seek further assistance.
Rather than have everyone start individual topics, it would be best (and more manageable for staff) if you posted any more questions, comments or requests for assistance in that topic discussion. Doing that will also ensure you receive proper assistance from our crypto malware experts since they may not see this thread. To avoid unnecessary confusion...this topic is closed.
The BC Staff