Ransom.MSIL.THANOS.THFOFBB
Ransom:MSIL/Hakbit.SK!MTB (MICROSOFT)
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 encrypts files with specific file extensions. It avoids encrypting files with the following file extensions.
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 adds the following processes:
- taskkill /F /IM RaccineSettings.exe
- reg delete "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /V "Raccine Tray" /F
- reg delete HKCU\Software\Raccine /F
- schtasks /DELETE /TN "Raccine Rules Updater" /F
- cmd.exe /c rd /s /q %SYSTEMDRIVE%\$Recycle.bin
- Sc.exe config Dnscache start= auto
- Sc.exe config FDResPub start= auto
- Sc.exe config SSDPSRV start= auto
- Sc.exe config upnphost start= auto
- Sc.exe config SQLTELEMETRY start= disabled
- Sc.exe config SQLTELEMETRY$ECWDB2 start= disabled
- Sc.exe config SQLWriter start= disabled
- Sc.exe config SstpSvc start= disabled
- taskkill.exe /IM mspub.exe /F
- taskkill.exe /IM mydesktopqos.exe /F
- taskkill.exe /IM mydesktopservice.exe /F
- taskkill.exe /IM mysqld.exe /F
- taskkill.exe /IM sqbcoreservice.exe /F
- taskkill.exe /IM firefoxconfig.exe /F
- taskkill.exe /IM agntsvc.exe /F
- taskkill.exe /IM thebat.exe /F
- taskkill.exe /IM steam.exe /F
- taskkill.exe /IM encsvc.exe /F
- taskkill.exe /IM excel.exe /F
- taskkill.exe /IM CNTAoSMgr.exe /F
- taskkill.exe /IM sqlwriter.exe /F
- taskkill.exe /IM tbirdconfig.exe /F
- taskkill.exe /IM dbeng50.exe /F
- taskkill.exe /IM thebat64.exe /F
- taskkill.exe /IM ocomm.exe /F
- taskkill.exe /IM infopath.exe /F
- taskkill.exe /IM mbamtray.exe /F
- taskkill.exe /IM zoolz.exe /F
- taskkill.exe /IM thunderbird.exe /F
- taskkill.exe /IM dbsnmp.exe /F
- taskkill.exe /IM xfssvccon.exe /F
- taskkill.exe /IM mspub.exe /F
- taskkill.exe /IM Ntrtscan.exe /F
- taskkill.exe /IM isqlplussvc.exe /F
- taskkill.exe /IM onenote.exe /F
- taskkill.exe /IM PccNTMon.exe /F
- taskkill.exe /IM msaccess.exe /F
- taskkill.exe /IM outlook.exe /F
- taskkill.exe /IM tmlisten.exe /F
- taskkill.exe /IM msftesql.exe /F
- taskkill.exe /IM powerpnt.exe /F
- taskkill.exe /IM mydesktopqos.exe /F
- taskkill.exe /IM visio.exe /F
- taskkill.exe /IM mydesktopservice.exe /F
- taskkill.exe /IM winword.exe /F
- taskkill.exe /IM mysqld-nt.exe /F
- taskkill.exe /IM wordpad.exe /F
- taskkill.exe /IM mysqld-opt.exe /F
- taskkill.exe /IM ocautoupds.exe /F
- taskkill.exe /IM ocssd.exe /F
- taskkill.exe /IM oracle.exe /F
- taskkill.exe /IM sqlagent.exe /F
- taskkill.exe /IM sqlbrowser.exe /F
- taskkill.exe IM sqlservr.exe /F
- taskkill.exe /IM synctime.exe /F
- powershell.exe & Get-WmiObject Win32_Shadowcopy | ForEach-Object { $_Delete(); }
- notepad.exe %Desktop%\RESTORE_FILES_INFO.txt
- cmd.exe /C ping 127.0.0.7 -n 3 > Nul & fsutil file setZeroData offset=0 length=524288 “%s” & Del /f /q “%s”
- cmd.exe "/C choice /C Y /N /D Y /T 3 & Del "{Malware Path}\{Malware Filename}.exe
(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 adds the following mutexes to ensure that only one of its copies runs at any one time:
- Global\8a3cd836-e8bb-428d-9e0b-d62e18cfe2d4
It loads the following configuration files:
- {Malware Path}\Config.enc
Autostart Technique
This Ransomware drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %Programs%\Startup\reload1.lnk
(Note: %Programs% is the folder that contains the user’s program groups, which is usually C:\Windows\Start Menu\Programs or C:\Documents and Settings\{User name}\Start Menu\Programs on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs on Windows Vista, 7, and 8.)
Other System Modifications
This Ransomware deletes the following files:
- {Malware Path}\Config.enc
It adds the following registry entries:
HKEY_CURRENT_USER\Software\KEYID\
myKeyID
ID1 = {Random}
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\FileSystem
LongPathsEnabled = 1
Process Termination
This Ransomware terminates the following processes if found running in the affected system's memory:
- http analyzer stand-alone
- fiddler
- effetech http sniffer
- firesheep
- IEWatch Professional
- dumpcap
- wireshark
- wireshark portable
- sysinternals tcpview
- NetworkMiner
- NetworkTrafficView
- HTTPNetworkSniffer
- tcpdump
- intercepter
- Intercepter-NG
- ollydbg
- x64dbg
- x32dbg
- dnspy
- dnspy-x86
- de4dot
- ilspy
- dotpeek
- dotpeek64
- ida64
- RDG Packer Detector
- CFF Explorer
- PEiD
- protection_id
- LordPE
- pe-sieve
- MegaDumper
- UnConfuserEx
- Universal_Fixer
- NoFuserEx
- cheatengine
Other Details
This Ransomware does the following:
- It encrypts all available drives (except for CDROMs).
- It empties the recycle bin.
- It deletes the following subkeys under {HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options}
- vssadmin.exe
- wmic.exe
- wbadmin.exe
- bcdedit.exe
- powershell.exe
- diskshadow.exe
- net.exe
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- dat
- txt
- jpeg
- gif
- jpg
- png
- php
- cs
- cpp
- rar
- zip
- html
- htm
- xlsx
- xls
- avi
- mp4
- ppt
- doc
- docx
- sxi
- sxw
- odt
- hwp
- tar
- bz2
- mkv
- eml
- msg
- ost
- pst
- edb
- sql
- accdb
- mdb
- dbf
- odb
- myd
- php
- java
- cpp
- pas
- asm
- key
- pfx
- pem
- p12
- csr
- gpg
- aes
- vsd
- odg
- raw
- nef
- svg
- psd
- vmx
- vmdk
- vdi
- lay6
- sqlite3
- sqlitedb
- java
- class
- mpeg
- djvu
- tiff
- backup
- cert
- docm
- xlsm
- dwg
- bak
- qbw
- nd
- tlg
- lgb
- pptx
- mov
- xdw
- ods
- wav
- mp3
- aiff
- flac
- m4a
- csv
- sql
- ora
- mdf
- ldf
- ndf
- dtsx
- rdl
- dim
- mrimg
- qbb
- rtf
- 7z
It avoids encrypting files with the following strings in their file name:
- autoexec.bat
- desktop.ini
- autorun.inf
- ntuser.dat
- NTUSER.DAT
- iconcache.db
- bootsect.bak
- boot.ini
- ntuser.dat.log
- thumbs.db
- bootmgr
- pagefile.sys
- config.sys
- ntuser.ini
- Builder_Log
- RSAKeys
- Config.enc
- RESTORE_FILES_INFO
- Recycle.Bin
- reload1.lnk
- Debug_Log.txt
- UserName={UserName}_MachineName={MachineName}_.txt
It avoids encrypting files with the following strings in their file path:
- C:\Program Files\
- C:\Program Files (x86)\
- :\Windows\
- Perflogs
- internet explorer
- :\ProgramData\
- \AppData\
- msocache
- system volume information
- boot
- tor browser
- mozilla
- appdata
- google chrome
- application data
- Microsoft SQL Server
It appends the following extension to the file name of the encrypted files:
- .NARUMI
It leaves text files that serve as ransom notes containing the following text:
- %Desktop%\RESTORE_FILES_INFO.txt
- %UserTemp%\RESTORE_FILES_INFO.txt
- {Encrypted Directory}\RESTORE_FILES_INFO.txt
It avoids encrypting files with the following file extensions:
- exe
- dll
- EXE
- DLL
- .NARUMI
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:
- TSPY.Win32.TRX.XXPE50FFF057
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
Restart in Safe Mode
Step 5
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- HKCU\Software\KEYID\myKeyID ID1 = {Random}
Step 6
Restore this modified registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\FileSystem LongPathsEnabled = 1
Step 7
Search and delete this file
- %Programs%\Startup\reload1.lnk
- %UserTemp%\RESTORE_FILES_INFO.txt
- %Desktop%\RESTORE_FILES_INFO.txt
- {Encrypted Directory}\RESTORE_FILES_INFO.txt
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.MSIL.THANOS.THFOFBB. 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 this Knowledge Base page for more information.
Step 9
Restore encrypted files from backup.
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