RANSOM_SHINOLOCK.A

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be manually installed by a user.

It gathers information and reports it to its servers.

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be manually installed by a user.

Installation

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

• %User Temp%\{random filename1}.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\ShinoLocker

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.shino

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ShinoLockerEncryptedFile

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
BitBucket\c

It adds the following registry entries:

HKEY_CURRENT_USER\Software\ShinoLocker
P = "%User Temp%\{random filename1}.exe"

HKEY_CURRENT_USER\Software\ShinoLocker
PS = "%User Temp%\{random filename2}.exe"

HKEY_CURRENT_USER\Software\ShinoLocker
FL = "C:\Users\dyituser_732\AppData\Local\Temp\{random filename 4}.lst"

HKEY_CURRENT_USER\Software\ShinoLocker
TF = "C:\Users\dyituser_732\AppData\Local\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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ShinoLockerEncryptedFile\shell\open\
command

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ShinoLockerEncryptedFile\DefaultIcon

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer
GlobalAssocChangedCounter = "24"

Dropping Routine

This Trojan drops the following files:

• %User Temp%\{random filename2}.exe-AES Encryptor/Decryptor
• {random filename 3}.txt.shino-Contains encrypted string
• {random filename 4}.lst-Contains the list of encrypted files

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other Details

This Trojan encrypts files with the following extensions:

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

It renames encrypted files using the following names:

• {filename of encrypted files}.shino

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

• https://{BLOCKED}ocker.com

NOTES:

This ransomware only encrypts files in the following folders:

• %Desktop%
• %Desktop%\{subfolders}

It has the following capabilities:

• Restore encrypted files
• Uninstall self

It displays the following user interface upon execution:

It replaces the encrypted files' icon with the malware's icon.