RANSOM_BTCWARE.AD
Trojan-Ransom.Win32.Bitcovar.ci (KASPERSKY); Ransom.BTCware (NORTON); Ransom:Win32/Betisrypt!rfn (MICROSOFT)
Windows
![](/vinfo/imgFiles/legend.jpg)
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 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 adds the following mutexes to ensure that only one of its copies runs at any one time:
- NUCLEAR
Other System Modifications
This Ransomware adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
DECRYPTINFO = %Application Data%\HELP.hta
Other Details
This Ransomware does the following:
- Executes the following command to disable/stop/delete Windows components:
- "%System%\cmd.exe" /c vssadmin.exe Delete Shadows /All /Quiet
- "%System%\cmd.exe" /c bcdedit.exe /set {default} recoveryenabled No
- "%System%\cmd.exe" /c bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
Ransomware Routine
This Ransomware avoids encrypting files with the following strings in their file name:
- HELP.hta
- BOOTMGR
- .nuclear
- nuclear
It avoids encrypting files with the following strings in their file path:
- device
- $recycle.bin
- msocache
- ProgramData
- programdata
- programdata\
- windows
- nvidia
- intel
- appdata
- inetpub
- temp
- program files
- program files (x86)
It appends the following extension to the file name of the encrypted files:
- .[hostname@bigmir.net].nuclear
It drops the following file(s) as ransom note:
- %Application Data%\HELP.hta
(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.)
NOTES:
This Ransomware displays the following window as its ransom note:
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
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
- DECRYPTINFO = %Application Data%\HELP.hta
- DECRYPTINFO = %Application Data%\HELP.hta
Step 5
Search and delete these files
- %Application Data%\HELP.hta
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_BTCWARE.AD. 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
Restore encrypted files from backup.
Did this description help? Tell us how we did.