Windows
This Ransomware arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Arrival Details
This Ransomware arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Ransomware drops the following file(s)/component(s):
It adds the following processes:
It creates the following folders:
Autostart Technique
This Ransomware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Microsoft Task Scheduler = "{location of malware}\{malware filename}.exe" /r 0
Other System Modifications
This Ransomware adds the following registry keys:
HKLM\SOFTWARE\WannaCryptor
HKCU\SOFTWARE\WannaCryptor
It changes the desktop wallpaper by modifying the following registry entries:
HKCU\Control Panel\Desktop
Wallpaper = "{location of malware}\!WannaDecryptor!.bmp"
It sets the system's desktop wallpaper to the following image:
Download Routine
This Ransomware accesses the following websites to download files:
Other Details
This Ransomware encrypts files with the following extensions:
It renames encrypted files using the following names:
It does the following:
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restart in Safe Mode
Step 4
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
Step 5
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
Step 6
Search and delete these folders
Step 7
Search and delete these files
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_WCRY.C. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
Step 9
Reset your Desktop properties
Step 10
Restore encrypted files from backup.