Win64/Filecoder.CI trojan (Nod32), Trojan-Ransom.FileCrypter (Ikarus)
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.
It executes then deletes itself afterward.
It drops files as ransom note. It avoids encrypting files with the following file extensions.
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 files:
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It adds the following processes:
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It executes then deletes itself afterward.
It adds the following mutexes to ensure that only one of its copies runs at any one time:
Other System Modifications
This Ransomware adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\Classes\
.{Generated ID}\shell\Open
(Default) = explorer.exe RecoveryManual.html
Process Termination
This Ransomware terminates the following services if found on the affected system:
It terminates the following processes if found running in the affected system's memory:
Information Theft
This Ransomware accepts the following parameters:
Ransomware Routine
This Ransomware avoids encrypting files with the following strings in their file name:
It avoids encrypting files with the following strings in their file path:
It avoids encrypting files found in the following folders:
It appends the following extension to the file name of the encrypted files:
It drops the following file(s) as ransom note:
It avoids encrypting files with the following file extensions:
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
Step 2
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 3
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 4
Identify and terminate files detected as Ransom.Win64.ASTROLOCKER.THCBDBA
Step 5
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 6
Search and delete this file
Step 7
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win64.ASTROLOCKER.THCBDBA. 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 8
Restore encrypted files from backup.