RANSOM_HIDDENTEARWUPDIS.A
Ransom:Win32/FileCryptor (Microsoft)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Ransomware
Destructiveness: No
Encrypted: Yes
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 drops files as ransom note.
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 copies of itself into the affected system:
- %Windows%\WinUpdatesDisabler.exe
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It drops the following files:
- C:\Key.txt
Autostart Technique
This Ransomware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
WinUpdatesDisabler = "%Windows%\WinUpdatesDisabler.exe"
Other System Modifications
This Ransomware adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Speech\AppLexicons
HKEY_CURRENT_USER\Software\Microsoft\
Speech\PhoneConverters
HKEY_CURRENT_USER\Software\Microsoft\
Speech\CurrentUserLexicon
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .7z
- .asp
- .aspx
- .avi
- .bmp
- .csv
- .doc
- .docx
- .gif
- .htm
- .html
- .jcf
- .jgf
- .jkm
- .jpg
- .jsb
- .jsd
- .jsh
- .jsm
- .jss
- .mdb
- .mp3
- .odt
- .php
- .png
- .ppt
- .pptx
- .psd
- .rar
- .sln
- .sql
- .txt
- .wav
- .wmv
- .xls
- .xlsx
- .xml
- .zip
It appends the following extension to the file name of the encrypted files:
- {filename}.zbt
It drops the following file(s) as ransom note:
- Payment information for decryption.txt
It leaves text files that serve as ransom notes containing the following text:
- Ej sestrice, moraš da gi platiš.
Ako gi ne platiš,
zakljucani fajlovi,
nema da gi vratiš
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
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\Run
- WinUpdatesDisabler = "%Windows%\WinUpdatesDisabler.exe""
- WinUpdatesDisabler = "%Windows%\WinUpdatesDisabler.exe""
Step 3
Delete this registry key
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\Speech
- AppLexicons
- AppLexicons
- In HKEY_CURRENT_USER\Software\Microsoft\Speech
- PhoneConverters
- PhoneConverters
- In HKEY_CURRENT_USER\Software\Microsoft\Speech
- CurrentUserLexicon
- CurrentUserLexicon
Step 4
Search and delete these files
Step 5
Scan your computer with your Trend Micro product to delete files detected as RANSOM_HIDDENTEARWUPDIS.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 6
Restore encrypted files from backup.
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