Ransom_Blocker.R002C0WJK19
Trojan:Win32/Tiggre!rfn (Microsoft); RDN/Ransom (McAfee); HEUR:Trojan-Ransom.MSIL.Blocker.gen (Kaspersky)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted:
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.
TECHNICAL DETAILS
605,184 bytes
EXE
Yes
10 Nov 2019
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 processes:
- schtasks.exe /create /sc MINUTE /mo 1 /tn "Windows Service" /tr "%AppDataLocal%\svran.exe" /f
- "%System Root%\Program Files\Windows Media Player\wmpnetwk.exe"
- %System%\svchost.exe -k LocalServiceAndNoImpersonation
- %System%\svchost.exe -k WerSvcGroup
(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It creates the following folders:
- %Windows%\ServiceProfiles\NetworkService\AppData\Local\Microsoft
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
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
Windows Service = "%AppDataLocal%\svran.exe"
Other System Modifications
This Ransomware deletes the following files:
- %Windows%\Tasks\Windows Service.job
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
Dropping Routine
This Ransomware drops the following files:
- %All Users Profile%\Microsoft\Windows\DRM\v3ks.sec
- %All Users Profile%\Microsoft\Windows\DRM\drmstore.hds
- %All Users Profile%\Microsoft\Network\Downloader\qmgr1.dat
- %All Users Profile%\Microsoft\Network\Downloader\qmgr0.dat
- %AppDataLocal%\svran.exe
- %AppDataLocal%\Microsoft\Media Player\CurrentDatabase_372.wmdb
(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). . %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
This report is generated via an automated analysis system.
SOLUTION
9.850
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
Identify and terminate files detected as Ransom_Blocker.R002C0WJK19
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
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
- Windows Service = "%AppDataLocal%\svran.exe"
Step 5
Search and delete these components
- %All Users Profile%\Microsoft\Windows\DRM\v3ks.sec
- %All Users Profile%\Microsoft\Windows\DRM\drmstore.hds
- %All Users Profile%\Microsoft\Network\Downloader\qmgr1.dat
- %All Users Profile%\Microsoft\Network\Downloader\qmgr0.dat
- %AppDataLocal%\svran.exe
- %AppDataLocal%\Microsoft\Media Player\CurrentDatabase_372.wmdb
Step 6
Search and delete this folder
- %Windows%\ServiceProfiles\NetworkService\AppData\Local\Microsoft
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom_Blocker.R002C0WJK19. 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.
Step 9
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %Windows%\Tasks\Windows Service.job
Did this description help? Tell us how we did.