Ransom.Win32.SPOOSH.THGAGBC
Generic.Ransom.DCRTR.7E80656D (BITDEFENDER)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, 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 connects to certain websites to send and receive information.
It drops files as ransom note. It avoids encrypting files with the following file extensions.
TECHNICAL DETAILS
5,153,366 bytes
EXE
No
18 Jul 2023
Connects to URLs/IPs, Collects system information, Encrypts files, Modifies system registry, Terminates processes, Drops 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 adds the following processes:
- %System%\cmd.exe /C "vssadmin delete shadows /all /quiet"
- %System%\cmd.exe /C "rd /s /q %systemdrive%\$Recycle.bin"
- %System%\WindowsPowershell\v1.0\powershell.exe -Command "New-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System' -Name EnableLinkedConnections -Value 1 -PropertyType 'DWord'"
- %System%\WindowsPowershell\v1.0\powershell.exe -Command "get-service LanmanWorkstation |Restart-Service –Force"
- attrib.exe -R {Directory to Encrypt}\{File Name to Encrypt}.{File Extension to Encrypt}
- mshta.exe %System Root%\Boot\cs-CZ\information.hta
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Other System Modifications
This Ransomware adds the following registry entries:
HKEY_CURRENT_USER\Printers\SettingsLow
DI = {8 Random Alphanumeric Characters}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
EnableLinkedConnections = 1
It sets the system's desktop wallpaper to the following image:
- %AppDataLocal%\wallpaper.jpg
(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).)
Process Termination
This Ransomware terminates the following processes if found running in the affected system's memory:
- Agntsvc.exe
- Dbeng50.exe
- Dbsnmp.exe
- Encsvc.exe
- Excel.exe
- Firefox.exe
- Infopath.exe
- Isqlplussvc.exe
- Msaccess.exe
- Mspub.exe
- Mydesktopqos.exe
- Mydesktopservice.exe
- Notepad.exe
- Ocautoupds.exe
- Ocomm.exe
- Ocssd.exe
- Onenote.exe
- Oracle.exe
- Outlook.exe
- Powerpnt.exe
- Sqbcoreservice.exe
- Sql.exe
- Steam.exe
- Synctime.exe
- Tbirdconfig.exe
- Thebat.exe
- Thunderbird.exe
- Ut.exe
- Utweb.exe
- Visio.exe
- Winword.exe
- Wordpad.exe
- Xfssvccon.exe
Dropping Routine
This Ransomware drops the following files:
- %AppDataLocal%\wallpaper.jpg
(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).)
Information Theft
This Ransomware gathers the following data:
- Processor Name
- Memory
- Internal IP Address
- Manufacturer
- OS Version
- Computer Name
- Product Name
- External IP Address
- Device ID
Other Details
This Ransomware adds the following registry keys:
HKEY_CURRENT_USER\Printers\SettingsLow
It connects to the following website to send and receive information:
- tcp://{BLOCKED}.{BLOCKED}.154.137:21119
It does the following:
- It terminates itself if the computer language is Russian
- It downloads the desktop wallpaper to be set from the following url:
- https://i.{BLOCKED}g.cc/JzpfvBFf/wallapaper.jpg
- It connects to the following url to identify the machine's external IP address:
- https://{BLOCKED}rnalip.com
Ransomware Routine
This Ransomware avoids encrypting files found in the following folders:
- $RECYCLE.BIN
- $Recycle.Bin
- $WINDOWS.~BT
- $WINDOWS.~WS
- $WinREAgent
- $Windows.~WS
- AdwCleaner
- AppData
- dev
- Documents and Settings
- Hyberfil
- MSOCache
- Pagefile
- PerfLogs
- Program Files
- Program Files (x86)
- ProgramData
- Recovery
- SYSTEM.SAV
- System Volume Information
- Thumbs
- Thumbs.db
- Windows.old
- windows.old
- Windows.old.000
- windows.old.000
It appends the following extension to the file name of the encrypted files:
- .[[{8 Random Alphanumeric Characters}]].[[{Email Address}]].sophos
It drops the following file(s) as ransom note:
- {Encrypted Directory}\information.hta
- %System Root%\Boot\cs-CZ\information.hta
It avoids encrypting files with the following file extensions:
- .adv
- .ani
- .bat
- .com
- .cpl
- .cur
- .deskthemepack
- .Devos
- .diagcab
- .diagcfg
- .diagpkg
- .dll
- .drv
- .faust
- .hlp
- .hta
- .icl
- .icns
- .ico
- .ics
- .idx
- .inf
- .ini
- .joker
- .key
- .ldf
- .lnk
- .lock
- .log
- .mkp
- .mod
- .mpa
- .msc
- .msp
- .msstyles
- .msu
- .nls
- .nomedia
- .ocx
- .prf
- .ps1
- .regtrans-ms
- .rom
- .rtp
- .scr
- .shs
- .sophos
- .spl
- .sys
- .theme
- .themepack
- .tmp
- .wpx
SOLUTION
9.800
18.582.02
20 Jul 2023
18.583.00
21 Jul 2023
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
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
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\Printers\SettingsLow
- DI = {8 Random Alphanumeric Characters}
- DI = {8 Random Alphanumeric Characters}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
- EnableLinkedConnections = 1
- EnableLinkedConnections = 1
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\Printers
- SettingsLow
- SettingsLow
Step 5
Search and delete this file
- {Encrypted Directory}\information.hta
- %AppDataLocal%\wallpaper.jpg
Step 6
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.SPOOSH.THGAGBC. 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:
Step 7
Restore encrypted files from backup.
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