Ransom.MSIL.SHINOLOCK.THKBCBC

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 gathers information and reports it to its servers.

It encrypts files found in specific folders.

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 a copy of itself in the following folders using different file names:

• %User Temp%\{Random filename 1}.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).)

It drops the following files:

• %User Temp%\{Random filename 3}.txt → sample file to encrypt
• %User Temp%\{Random filename 4}.lst → contains the list of encrypted files

(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).)

It drops and executes the following files:

• %User Temp%\{Random filename 2}.exe → AES Encryptor/Decryptor

(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).)

It adds the following processes:

• "%System%\vssadmin.exe" delete shadows /all /quiet
• "%User Temp%\{Random filename 2}.exe" E Wez03hsEhpTFfcIBCH1CnQ== D91JCmhNvM0wuImxRf7PuQ== "%User Temp%\{Random filename 3}.txt" → AES Encryptor to encrypt sample file
• "%User Temp%\{Random filename 2}.exe" D D91JCmhNvM0wuImxRf7PuQ== "%User Temp%\{Random filename 3}.txt.shino" → AES Decryptor to decrypt sample file
• "%User Temp%\{Random filename 2}.exe" E Wez03hsEhpTFfcIBCH1CnQ== D91JCmhNvM0wuImxRf7PuQ== "%Desktop%\{target file}" → AES Encryptor to encrypt target files in Desktop folder
• "%User Temp%\{Random filename 2}.exe" E Wez03hsEhpTFfcIBCH1CnQ== D91JCmhNvM0wuImxRf7PuQ== "%Desktop%\{subfolders}\{target file}" → AES Encryptor to encrypt target files in Desktop subfolders

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %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).. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Ransomware adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\ShinoLocker
P = %User Temp%\{Random filename 1}.exe

HKEY_CURRENT_USER\Software\ShinoLocker
PS = %User Temp%\{Random filename 2}.exe

HKEY_CURRENT_USER\Software\ShinoLocker
FL = %User Temp%\{Random filename 4}.lst

HKEY_CURRENT_USER\Software\ShinoLocker
TF = %User Temp%\{Random filename 3}.txt

HKEY_CURRENT_USER\Software\ShinoLocker
TD = {string}

HKEY_CURRENT_USER\Software\ShinoLocker
H = 1

HKEY_CURRENT_USER\Software\ShinoLocker
V = "{B64 string}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
BitBucket\c
NeedToPurge = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.shino
(Default) = ShinoLockerEncryptedFile

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ShinoLockerEncryptedFile\shell\open\
command
(Default) = %User Temp%\{Random filename 1}.exe "%l"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ShinoLockerEncryptedFile\DefaultIcon
(Default) = %User Temp%\{Random filename 1}.exe, 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer
GlobalAssocChangedCounter = 37

Other Details

Based on analysis of the codes, it has the following capabilities:

• Restore Encrypted files
• Uninstall itself

It encrypts files with the following extensions:

• .bmp
• .jpg
• .jpeg
• .png
• .wmv
• .avi
• .mov
• .mp4
• .mp3
• .wav
• .pptx
• .doc
• .docx
• .xls
• .xlsx
• .doc

It does the following:

• It displays the following user interface upon execution:
  
• It replaces the encrypted files' icon with the malware's icon.

It gathers the following information and reports it to its servers:

• https://{BLOCKED}ocker.com

Ransomware Routine

This Ransomware encrypts files found in the following folders:

• %Desktop%
• %Desktop%\{subfolders}

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It appends the following extension to the file name of the encrypted files:

• .shino