Ransom.Win32.CRYSIS.TIBGGD

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 copies of itself in the Windows Common Startup folder to enable its automatic execution at every system startup.

It drops files as ransom note. It avoids encrypting files with the following file extensions.

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 copies of itself into the affected system:

• %AppDataLocal%\{malware filename}.exe
• %User Startup%\{malware filename}.exe
• %Common Startup%\{malware filename}.exe

(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).. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).. %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.)

It adds the following processes:

• vssadmin delete shadows /all /quiet
• netsh advfirewall set currentprofile state off
• wmic shadowcopy delete
• bcdedit /set {default} bootstatuspolicy ignoreallfailures
• bcdedit /set {default} recoveryenabled no
• wbadmin delete catalog -quiet
• netsh firewall set opmode mode=disable

Autostart Technique

This Ransomware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{malware filename} = %AppDataLocal%\{malware filename}.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{malware filename} = %AppDataLocal%\{malware filename}.exe

It drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

• %User Startup%\{malware filename}.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)

It drops copies of itself in the Windows Common Startup folder to enable its automatic execution at every system startup.

Process Termination

This Ransomware terminates the following processes if found running in the affected system's memory:

• msftesql.exe
• sqlagent.exe
• sqlbrowser.exe
• sqlservr.exe
• sqlwriter.exe
• oracle.exe
• ocssd.exe
• dbsnmp.exe
• synctime.exe
• agntsvc.exe
• mydesktopqos.exe
• isqlplussvc.exe
• xfssvccon.exe
• mydesktopservice.exe
• ocautoupds.exe
• encsvc.exe
• firefoxconfig.exe
• tbirdconfig.exe
• ocomm.exe
• mysqld.exe
• mysqld-nt.exe
• mysqld-opt.exe
• dbeng50.exe
• sqbcoreservice.exe
• excel.exe
• infopath.exe
• msaccess.exe
• mspub.exe
• onenote.exe
• outlook.exe
• powerpnt.exe
• steam.exe
• thebat.exe
• thebat64.exe
• thunderbird.exe
• visio.exe
• winword.exe
• wordpad.exe

Ransomware Routine

This Ransomware avoids encrypting files with the following strings in their file name:

• info.hta
• info.txt
• boot.ini
• bootfont.bin
• ntldr
• ntdetect.com
• io.sys
• {malware filename}.exe

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

• .id[{random key}-2749].[{BLOCKED}eam777@aol.com].dewar

It drops the following file(s) as ransom note:

• %Desktop%\info.hta
  
• %Desktop%\info.txt → detected as Ransom.Win32.CRYSIS.TIBGGD.note
  

It avoids encrypting files with the following file extensions:

• .dewar
• .actin
• .acton
• .actor
• .acuff
• .acuna
• .acute
• .adage
• .adair
• .adame
• .banhu
• .banjo
• .banks
• .banta
• .barak
• .caleb
• .cales
• .caley
• .calix
• .calle
• .calum
• .calvo
• .deuce
• .dever
• .devil
• .devoe
• .devon
• .devos
• .eight
• .eject
• .eking
• .elbie
• .elbow
• .elder
• .phobos
• .blend
• .mamba
• .karlos
• .phoenix
• .karma
• .capital
• .wallet
• .accdb
• .accdc
• .accde
• .db-journal
• .db-shm
• .db-wal
• .sqlitedb
• .sqlite3
• .sqlite