Ransom_HIDDENTEARLAG.A
Ransom.HiddenTear!g1(Norton);Ransom:MSIL/Ryzerlo.A(Microsoft);Troj/HTRansom-B(Sophos)
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.
It encrypts files with specific file extensions. It encrypts files found in specific folders. It drops files as ransom note.
TECHNICAL DETAILS
218,112 bytes
EXE
No
14 Jul 2017
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:
- C:\{user name}\bg.jpg ← used as wallpaper
Other System Modifications
This Ransomware changes the desktop wallpaper by modifying the following registry entries:
HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = C:\{Username}\bg.jpg
(Note: The default value data of the said registry entry is {user preference}.)
It sets the system's desktop wallpaper to the following image:
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .wmv
- .txt
- .jar
- .exe
- .dat
- .contact
- .settings
- .doc
- .docx
- .xls
- .xlsx
- .ppt
- .pptx
- .odt
- .jpg
- .png
- .csv
- .py
- .sql
- .mdb
- .sln
- .php
- .asp
- .aspx
- .html
- .htm
- .xml
- .psd
- .dll
- .c
- .cs
- .mp3
- .mp4
- .f3d
- .dwg
- .cpp
- .zip
- .rar
- .mov
- .rtf
- .bmp
- .mkv
- .avi
- .apk
- .lnk
- .iso
- .7-zip
- .ace
- .arj
- .bz2
- .cab
- .gzip
- .lzh
- .tar
- .uue
- .xz
- .z
- .001
- .mpeg
- .mp3
- .mpg
- .core
- .crproj
- .pdb
- .ico
- .pas
- .db
- .torrent
It encrypts files found in the following folders:
- C:\Users\Public
- The following folders found in C:\Users\{Username}
- Desktop
- Contacts
- Documents
- Downloads
- Pictures
- Music
- OneDrive
- Saved Games
- Favorites
- Searches
- Videos
- Links
It appends the following extension to the file name of the encrypted files:
- .xdxdlol
It drops the following file(s) as ransom note:
- C:\{user name}\Desktop\read_me.txt
It leaves text files that serve as ransom notes containing the following text:
SOLUTION
9.850
13.530.07
13 Jul 2017
13.531.00
14 Jul 2017
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
Search and delete this file
- C:\{user name}\Desktop\read_me.txt
- C:\{user name}\bg.jpg
Step 4
Scan your computer with your Trend Micro product to delete files detected as Ransom_HIDDENTEARLAG.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 5
Reset your Desktop properties
Step 6
Restore encrypted files from backup.
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