RANSOM_HIDDENTEARMATROSKA.A
Ransom.HiddenTear (Symantec); Ransom.Matroska (Malwarebytes)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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.
TECHNICAL DETAILS
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:
- {folder of encrypted files}\HOW_TO_RECOVER_ENCRYPTED_FILES.txt
- {malware current directory}\zalupka.txt.encrypted[Payfordecrypt@protonmail.com]
Ransomware Routine
This Ransomware avoids encrypting files with the following strings in their file name:
- HOW_TO_RECOVER_ENCRYPTED_FILES
- papki.txt
- .encrypted[Payfordecrypt@protonmail.com]
It avoids encrypting files with the following strings in their file path:
- C:\windows
- C:\$Recycle.Bin
- C:\System Volume Information
- C:\PerfLogs
- C:\Intel
- C:\MSOCache
It appends the following extension to the file name of the encrypted files:
- {original filename}.encrypted[{BLOCKED}decrypt@protonmail.com ]
It leaves text files that serve as ransom notes containing the following text:
NOTES:
This ransomware displays the following window before encryption:
SOLUTION
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
Scan your computer with your Trend Micro product to delete files detected as RANSOM_HIDDENTEARMATROSKA.A. 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 4
Search and delete this file
- {folder of encrypted files}\HOW_TO_RECOVER_ENCRYPTED_FILES.txt
- {malware current directory}\zalupka.txt.encrypted[Payfordecrypt@protonmail.com]
Step 5
Restore encrypted files from backup.
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