- Threat Encyclopedia
- Malware
- Ransom.Win32.RYUK.HTW
Gen:Variant.Ursu.576438 (BitDefender); Win32:Trojan-gen (AVAST)
Windows
This Ransomware 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 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 copies of itself into the affected system:
It adds the following processes:
Ransomware Routine
This Ransomware appends the following extension to the file name of the encrypted files:
It leaves text files that serve as ransom notes containing the following text:
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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
Identify and terminate files detected as Ransom.Win32.RYUK.HTW
Step 4
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.RYUK.HTW. 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 the following Trend Micro Support pages for more information:
Step 5
Restore encrypted files from backup.