Ransom.Win32.VOIDCRYPT.THDAIBA
Ransom:Win32/HydraCrypt.PAA!MTB (Microsoft), Trojan-Ransom.Ouroboros (Ikarus)
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.
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 drops the following files:
- %ProgramData%\IDk.txt
- %ProgramData%\pkey.txt
- %ProgramData%\prvkey1.txt
- %ProgramData%\prvkey.txt.key
(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.)
It adds the following processes:
- cmd.exe /c net stop SQLWriter
- cmd.exe /c net stop SQLBrowser
- cmd.exe /c net stop MSSQLSERVER
- cmd.exe /c net stop MSSQL$CONTOSO1
- cmd.exe /c net stop MSDTC
- cmd.exe /c net stop SQLSERVERAGENT
- cmd.exe /c net stop vds
- net1 stop SQLWriter
- net1 stop SQLBrowser
- net1 stop MSSQLSERVER
- net1 stop MSSQL$CONTOSO1
- net1 stop MSDTC
- net1 stop SQLSERVERAGENT
- net1 stop vds
- cmd.exe /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
- cmd.exe /c bcdedit /set {default} recoveryenabled no
- cmd.exe /c wbadmin delete catalog -quiet
- cmd.exe /c netsh advfirewall set currentprofile state off
- cmd.exe /c netsh firewall set opmode mode=disable
Autostart Technique
This Ransomware drops the following file(s) in the Startup Items folder to enable its automatic execution at every system startup:
- %Common Startup%\{Malware Name}.exe
(Note: %Common Startup% is the startup folder for all users, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003, or C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Process Termination
This Ransomware terminates the following processes if found running in the affected system's memory:
- sqlserver.exe
- msftesql.exe
- sqlagent.exe
- sqlbrowser.exe
- sqlwriter.exe
- mysqld.exe
- mysqld-nt.exe
- mysqld-opt.exe
Other Details
This Ransomware connects to the following URL(s) to get the affected system's IP address:
- https://api.my-ip.io/ip
It does the following:
- Sends the key, IP Address, and Generated ID to the following URL:
- {BLOCKED}.{BLOCKED}.46.250/postme
Ransomware Routine
This Ransomware avoids encrypting files found in the following folders:
- %Windows%
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It appends the following extension to the file name of the encrypted files:
- .[wyooy@tutanota.com][{Generated ID}].hydra
It drops the following file(s) as ransom note:
- {Encrypted Folder}\Decrypt-me.txt
SOLUTION
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
Step 2
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 3
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 4
Identify and terminate files detected as Ransom.Win32.VOIDCRYPT.THDAIBA
- 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 5
Search and delete these files
%ProgramData%\pkey.txt
%ProgramData%\prvkey1.txt
%ProgramData%\prvkey.txt.key
%Common Startup%\{Malware Name}.exe
{Encrypted Folder}\Decrypt-me.txt
Step 6
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.VOIDCRYPT.THDAIBA. 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.
Did this description help? Tell us how we did.