Ransom.Win32.SHADE.THJBAAI
Ransom:Win32/Shade.PA!MTB (Microsoft); Trojan-FRNO!CF1B6AA96B85 (McAfee); Trojan.Win32.Miner.aahgi (Kaspersky); Mal/GandCrab-G (Sophos)
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
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:
- "{malware file path and name}"
It creates the following folders:
- %All Users Profile%\Windows
- %User Temp%\6893A5D897
(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). . %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
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
Client Server Runtime Subsystem = "%All Users Profile%\Windows\csrss.exe"
Other System Modifications
This Ransomware adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\System32\
Configuration
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
System32\Configuration
xi = "F93EE103F10B2CADEC95"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
System32\Configuration
xVersion = "4.0.0.1"
Dropping Routine
This Ransomware drops the following files:
- %User Temp%\6893A5D897\lock
- %User Temp%\6893A5D897\state
- %All Users Profile%\Windows\csrss.exe
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %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). )
Other Details
This Ransomware connects to the following possibly malicious URL:
- {BLOCKED}17.194
- {BLOCKED}.193.9
- {BLOCKED}.0.39
This report is generated via an automated analysis system.
SOLUTION
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.Win32.SHADE.THJBAAI
- 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 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_LOCAL_MACHINE\SOFTWARE\System32
- Configuration
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\Run
- Client Server Runtime Subsystem = "%All Users Profile%\Windows\csrss.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\System32\Configuration
- xi = "F93EE103F10B2CADEC95"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\System32\Configuration
- xVersion = "4.0.0.1"
Step 6
Search and delete these components
- %User Temp%\6893A5D897\lock
- %User Temp%\6893A5D897\state
- %All Users Profile%\Windows\csrss.exe
Step 7
Search and delete these folders
- %All Users Profile%\Windows
- %User Temp%\6893A5D897
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.Win32.SHADE.THJBAAI. 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 9
Restore encrypted files from backup.
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