RANSOM_BTCWARE.THABIH
Ransom.BTCware (NORTON); Trojan-Ransom.Win32.Foreign.nxtl (KASPERSKY)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
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 is capable of encrypting files in the affected system.
It encrypts files found in specific folders. It drops files as ransom note.
TECHNICAL DETAILS
929,792 bytes
, EXE
No
23 Jan 2018
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 drops the following copies of itself into the affected system:
- %Application Data%\info.exe
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Autostart Technique
This Ransomware adds the following registry entries to enable its automatic execution at every system startup:
HKCU\Software\Microsoft\
Windows\CurrentVersion\Run
Encrypter = %Application Data%\info.exe
Other System Modifications
This Ransomware adds the following registry entries as part of its installation routine:
HKCU\Software\Microsoft\
Windows\CurrentVersion\Run
userinfo = %Application Data%\recovery.txt
HKCU\Software\Encrypt Keys
local_enc_private_key_len = {hex values}
HKCU\Software\Encrypt Keys
local_enc_private_key = {hex values}
HKCU\Software\Encrypt Keys
local_enc_public_key_len = {hex values}
HKCU\Software\Encrypt Keys
local_enc_public_key = {hex values}
Other Details
This Ransomware is capable of encrypting files in the affected system.
It executes the following command to disable/stop/delete Windows components:
- cmd.exe /c vssadmin.exe Delete Shadows /All /Quiet
- cmd.exe /c bcdedit.exe /set {default} recoveryenabled No
- cmd.exe /c bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures
- cmd.exe /c taskkill /f /im oracle.exe
- cmd.exe /c taskkill /f /im sqlite.exe
- cmd.exe /c taskkill /f /im sql.exe
Ransomware Routine
This Ransomware encrypts files found in the following folders:
- {Drive Letter}:\
It avoids encrypting files with the following strings in their file path:
- Windows
- temp
- intel
- nvidia
- ProgramData
It appends the following extension to the file name of the encrypted files:
- rapid
It drops the following file(s) as ransom note:
- %Application Data%\recovery.txt - inside the folder of the malware copy
- How Recovery Files.txt - inside the folder/s where files are encrypted
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It leaves text files that serve as ransom notes containing the following text:
SOLUTION
9.850
13.934.01
28 Jan 2018
13.935.00
29 Jan 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
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
- Encrypter = %Application Data%\info.exe
- Encrypter = %Application Data%\info.exe
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- userinfo = %Application Data%\recovery.txt
- userinfo = %Application Data%\recovery.txt
- In HKEY_CURRENT_USER\Software\Encrypt Keys
- local_enc_private_key_len = {hex values}
- local_enc_private_key_len = {hex values}
- In HKEY_CURRENT_USER\Software\Encrypt Keys
- local_enc_private_key = {hex values}
- local_enc_private_key = {hex values}
- In HKEY_CURRENT_USER\Software\Encrypt Keys
- local_enc_public_key_len = {hex values}
- local_enc_public_key_len = {hex values}
- In HKEY_CURRENT_USER\Software\Encrypt Keys
- local_enc_public_key = {hex values}
- local_enc_public_key = {hex values}
Step 5
Search and delete these files
- %Application Data%\info.exe
- %Application Data%\recovery.txt
- How Recovery Files.txt
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_BTCWARE.THABIH. 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 7
Scan your computer with your Trend Micro product to delete files detected as RANSOM_BTCWARE.THABIH. 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:
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