RANSOM_HIDDENTEARRADION.C
Trojan:Win32/Tiggre!rfn (Microsoft); Ransom.HiddenTear/Variant (SUPERAntiSpyware); Trojan-Ransom.Ranion (A) (Emsisoft)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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 steals certain information from the system and/or the user.
It connects to certain websites to send and receive information.
It encrypts files with specific file extensions. It encrypts files found in specific folders. It drops files as ransom note.
TECHNICAL DETAILS
261,120 bytes
EXE
No
29 Nov 2017
Connects to URLs/IPs, Steals information, Displays graphics/image, Displays message/message boxes, Encrypts files
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 adds the following mutexes to ensure that only one of its copies runs at any one time:
- Global\{Malware Name}
Other System Modifications
This Ransomware adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies
DisableTaskMgr = 1
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Message_2017 = %System Root%\Users\Public\README_TO_DECRYPT_FILES.html
It changes the desktop wallpaper by modifying the following registry entries:
HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = {Malware Directory}\wallpaper.jpg
It sets the system's desktop wallpaper to the following image:
- {Malware Directory}\wallpaper.jpg
Download Routine
This Ransomware connects to the following URL(s) to download its component file(s):
- http://sk.{BLOCKED}s.im/BZL0O.jpg - wallpaper.jpg
Information Theft
This Ransomware steals the following information:
- OS version
- Username
- Date of encryption
- Machine name
- IP address
Other Details
This Ransomware connects to the following website to send and receive information:
- https://{BLOCKED}jgot5cud3p.{BLOCKED}n.to/dash/a0313cc69d69ab4d61373c8c1917f91f.php
- http://{BLOCKED}jgot5cud3p.{BLOCKED}n.link/dash/a0313cc69d69ab4d61373c8c1917f91f.php
It does the following:
- The Ransomware checks if the system date is before December 22, 2017 before encrypting files. Otherwise, it will delete itself by executing the following command: cmd.exe /C choice /C Y /N /D Y /T 3 & Del {Malware Directory}\{Malware name}.exe
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .txt
- .rtf
- .doc
- .docx
- .xls
- .xlsx
- .ppt
- .pptx
- .odt
- .ods
- .jpg
- .jpeg
- .png
- .gif
- .bmp
- .csv
- .sql
- .mdb
- .db
- .accdb
- .sln
- .php
- .jsp
- .asp
- .aspx
- .html
- .htm
- .xml
- .psd
- .cs
- .msg
It encrypts files found in the following folders:
- %User Profile%\
- C:\ to Z:\
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It appends the following extension to the file name of the encrypted files:
- .ransom
It drops the following file(s) as ransom note:
- %System Root%\Users\Public\README_TO_DECRYPT_FILES.txt
- %System Root%\Users\Public\README_TO_DECRYPT_FILES.html
- %System Root%\Users\Public\PROCHTI_MENYA_DLYA_RASSHIFROVKI_FAYLOV.txt
- %System Root%\Users\Public\LESEN_SIE_MICH_UM_DATEIEN_ZU_ENTSCHLUSSELN.txt
- %System Root%\Users\Public\LISEZ-MOI_POUR_DECHIFFRER_LES_FICHIERS.txt
- %System Root%\Users\Public\LEAME_PARA_DESCIFRAR_ARCHIVOS.txt
- %System Root%\Users\Public\LEGGIMI_PER_DECIFRARE_I_FILES.txt
- %System Root%\Users\Public\LEESMIJ-BESTAND_VOOR_HET_DECODEREN_VAN_BESTANDEN.txt
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
NOTES:
This ransomware displays the following:
SOLUTION
9.850
14.174.04
06 Apr 2018
14.175.00
07 Apr 2018
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
Search and delete these files
- %System Root%\Users\Public\README_TO_DECRYPT_FILES.txt
- %System Root%\Users\Public\README_TO_DECRYPT_FILES.html
- %System Root%\Users\Public\PROCHTI_MENYA_DLYA_RASSHIFROVKI_FAYLOV.txt
- %System Root%\Users\Public\LESEN_SIE_MICH_UM_DATEIEN_ZU_ENTSCHLUSSELN.txt
- %System Root%\Users\Public\LISEZ-MOI_POUR_DECHIFFRER_LES_FICHIERS.txt
- %System Root%\Users\Public\LEAME_PARA_DESCIFRAR_ARCHIVOS.txt
- %System Root%\Users\Public\LEGGIMI_PER_DECIFRARE_I_FILES.txt
- %System Root%\Users\Public\LEESMIJ-BESTAND_VOOR_HET_DECODEREN_VAN_BESTANDEN.txt
- {Malware Directory}\wallpaper.jpg
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.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
- DisableTaskMgr = 1
- DisableTaskMgr = 1
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Message_2017 = %System Root%\Users\Public\README_TO_DECRYPT_FILES.html
- Message_2017 = %System Root%\Users\Public\README_TO_DECRYPT_FILES.html
Step 6
Reset your Desktop properties
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_HIDDENTEARRADION.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 8
Restore encrypted files from backup.
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