Ransom.MSIL.HAVANACRYPT.THFACBB

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 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.

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
GoogleUpdate = %ProgramData%\{Random Characters}.exe

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

• %User Startup%\{Random Characters}.exe → copy of itself
• %User Startup%\vallo.bat → Disables Task Manager

(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).)

Process Termination

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

• agntsvc
• agntsvc
• axlbridge
• ccevtmgr
• ccsetmgr
• contoso1
• culserver
• culture
• dbeng50
• dbeng8
• dbsnmp
• dbsrv12
• dbsrv12
• defwatch
• defwatch
• encsvc
• excel
• fdlauncher
• firefoxconfig
• httpd
• infopath
• isqlplussvc
• msaccess
• msdtc
• msdtsrvr
• msftesql
• msmdsrv
• mspub
• mssql
• mssqlserver
• mydesktopqos
• mydesktopservice
• mysqld
• mysqld-nt
• mysqld-opt
• ocautoupds
• ocomm
• ocssd
• onenote
• oracle
• outlook
• powerpnt
• qbcfmonitorservice
• qbcfmonitorservice
• qbdbmgr
• qbidpservice
• qbidpservice
• qbupdate
• qbw32
• quickboooks.fcs
• ragui
• rtvscan
• rtvscan
• savroam
• sqbcoreservice
• sqladhlp
• sqladhlp
• sqlagent
• sqlagent
• sqlbrowser
• sqlbrowser
• sqlserv
• sqlserveragent
• sqlservr
• sqlwriter
• sqlwriter
• steam
• supervise
• synctime
• tbirdconfig
• thebat
• thebat64
• thunderbird
• tomcat6
• tomcat6
• vds
• visio
• vmware-converter
• vmware-converter
• vmware-usbarbitator64
• vmware-usbarbitator64
• winword
• winword
• word
• wordpad
• wrapper
• wxserver
• wxserverview
• xfssvccon
• zhudongfangyu
• zhundongfangyu

Download Routine

This Ransomware connects to the following URL(s) to download its component file(s):

• http://{BLOCKED}.{BLOCKED}.128.33/2.txt

Information Theft

This Ransomware gathers the following data:

• Username
• Token
• Date
• RAM information
• OS Information

Stolen Information

This Ransomware sends the gathered information via HTTP POST to the following URL:

• http://{BLOCKED}.{BLOCKED}.128.33/index.php

Other Details

This Ransomware connects to the following website to send and receive information:

• http://{BLOCKED}.{BLOCKED}.128.33/ham.php

It does the following:

• It terminates itself if it finds the following virtual machine/sandbox artifacts in the affected system:
  
  • %System%\Drivers\Vmmouse.sys
  • %System%\Drivers\vm3dgl.dll
  • %System%\Drivers\vmdum.dll
  • %System%\Drivers\vm3dver.dll
  • %System%\Drivers\vmtray.dll
  • %System%\Drivers\VMToolsHook.dll
  • %System%\Drivers\vmmousever.dll
  • %System%\Drivers\vmhgfs.dll
  • %System%\Drivers\vmGuestLib.dll
  • %System%\Drivers\VmGuestLibJava.dll
  • %System%\Driversvmhgfs.dll
  • %System%\Drivers\VBoxMouse.sys
  • %System%\Drivers\VBoxGuest.sys
  • %System%\Drivers\VBoxSF.sys
  • %System%\Drivers\VBoxideo.sys
  • %System%\vboxdisp.dll
  • %System%\voxhook.dll
  • %System%\vboxmrxnp.dll
  • %System%\vboxogl.dll
  • %System%\vboxoglarraysp.dll
  • %System%\vboxoglcrutil.dll
  • %System%\vboxoglerrorspu.dll
  • %System%\vboxoglfeedbackspu.dll
  • %System%\vboxoglpackspu.dll
  • %System%\vboxoglpassthroughspu.dll
  • %System%\vboxservice.exe
  • %System%\vboxtray.exe
  • %System%\VBoxControl.exe
• It terminates itself if services found running in the affected system:
  
  • VMTools
  • Vmhgfs
  • VMMEMCTL
  • Vmmouse
  • Vmrawdsk
  • Vmusbmouse
  • Vmvss
  • Vmscsi
  • Vmxnet
  • vmx_svga
  • Vmware Tools
  • Vmware Physical Disk Helper Service
• It terminates itself when executed in the following environments:
  • VMware ESX,VMware GSX Server
  • Standalone VMware vSphere
  • VMware Wrokstation
  • VMware Horizon
  • VMware
  • VMware vSphere
  • VMware ESX Server
  • Oracle VirtualBox 5.2
• It terminates itself if it finds the following processes in the affected system's memory:
  
  • vmtoolsd.exe
  • vmwaretrat.exe
  • vmwareuser.exe
  • vmacthlp.exe
  • vboxservice.exe
  • vboxtray.exe
  • vbox.exe

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Ransomware Routine

This Ransomware avoids encrypting files found in the following folders:

• tmp
• winnt
• application data
• appdata
• temp
• thumb
• $recycle.bin
• system volume information
• program files
• program files (x86)
• windows
• boot
• bios
• programdata
• windows.old
• tor browser
• microsoft
• havana
• .nuget
• symbols

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

• .Havana

It avoids encrypting files with the following file extensions:

• .dll
• .lnk
• .sys
• .msi
• .bat
• .iso
• .Havana