Analysis by: Joshua Paul Ignacio
ALIASES:

Ransom:Win32/Paradise.BC!MTB (MICROSOFT)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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 drops files as ransom note.

  TECHNICAL DETAILS

File Size: 58,368 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 09 Nov 2020
Payload: Encrypts files, Drops files, Displays graphics/image

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 files:

  • {Malware Path}\del.bat → Deletes main sample and itself afterwards

It adds the following processes:

  • "%System%\cmd.exe" NetSh Advfirewall set allprofiles state off
  • "cmd.exe" vssadmin delete shadows /all /quiet → Deletes shadow copies
  • "%System%\mshta.exe" "{Malware Path}\how to recover my files.hta"

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

Other Details

This Ransomware does the following:

  • It executes the following command to disable/stop/delete Windows components:
    • "%System%\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -DisableRealtimeMonitoring $true
    • "%System%\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -DisableBehaviorMonitoring $true
    • "%System%\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -DisableBlockAtFirstSeen $true
    • "%System%\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -DisableIOAVProtection $true
    • "%System%\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -SignatureDisableUpdateOnStartupWithoutEngine $true
    • "%System%\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -DisableArchiveScanning $true
    • "%System%\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -DisableIntrusionPreventionSystem $true
    • "%System%\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -DisableScriptScanning $true

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

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .123
  • .3dm
  • .3ds
  • .3g2
  • .3gp
  • .602
  • .7z
  • .accdb
  • .aes
  • .ARC
  • .asc
  • .asf
  • .asm
  • .avi
  • .backup
  • .bak
  • .bat
  • .bmp
  • .brd
  • .bz2
  • .c
  • .cgm
  • .class
  • .cmd
  • .cpp
  • .crt
  • .cs
  • .csr
  • .csv
  • .db
  • .dbf
  • .dch
  • .der
  • .dif
  • .dip
  • .djvu
  • .doc
  • .docb
  • .docm
  • .docx
  • .dot
  • .dotm
  • .dotx
  • .dwg
  • .edb
  • .eml
  • .fla
  • .flv
  • .frm
  • .gif
  • .gpg
  • .gz
  • .h
  • .hwp
  • .ibd
  • .iso
  • .jar
  • .java
  • .jpeg
  • .jpg
  • .js
  • .jsp
  • .key
  • .lay
  • .lay6
  • .ldf
  • .m3u
  • .m4u
  • .max
  • .mdb
  • .mdf
  • .mid
  • .mkv
  • .mml
  • .mov
  • .mp3
  • .mp4
  • .mpeg
  • .mpg
  • .msg
  • .myd
  • .myi
  • .odb
  • .odg
  • .odp
  • .ods
  • .odt
  • .onetoc2
  • .ost
  • .otg
  • .otp
  • .ots
  • .ott
  • .p12
  • .PAQ
  • .pas
  • .pdf
  • .pem
  • .pfx
  • .phpasp
  • .pl
  • .png
  • .pot
  • .potm
  • .potx
  • .ppam
  • .pps
  • .ppsm
  • .ppsx
  • .ppt
  • .pptm
  • .pptx
  • .ps1
  • .psdnef
  • .pst
  • .rar
  • .raw
  • .rb
  • .rtf
  • .sch
  • .sh
  • .sldm
  • .sldx
  • .slk
  • .sln
  • .snt
  • .sql
  • .sqlite3
  • .sqlitedb
  • .stc
  • .std
  • .sti
  • .stw
  • .suo
  • .svgai
  • .swf
  • .sxc
  • .sxd
  • .sxi
  • .sxm
  • .sxw
  • .tar
  • .tbk
  • .tgz
  • .tif
  • .tiff
  • .txt
  • .uop
  • .uot
  • .vb
  • .vbs
  • .vcd
  • .vdi
  • .vmdk
  • .vmx
  • .vob
  • .vsd
  • .vsdx
  • .wav
  • .wb2
  • .wk1
  • .wks
  • .wma
  • .wmv
  • .xlc
  • .xlm
  • .xls
  • .xlsb
  • .xlsm
  • .xlsx
  • .xlt
  • .xltm
  • .xltx
  • .xlw
  • .zip

It renames encrypted files using the following names:

  • {Original Filename}.{Original File Extension}.id={Generated ID}.email=Mr.Perfect@tutamail.com.Viper

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

  • {Encrypted Directory}\how to recover my files.hta

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.340.03
FIRST VSAPI PATTERN DATE: 09 Nov 2020
VSAPI OPR PATTERN File: 16.341.00
VSAPI OPR PATTERN Date: 10 Nov 2020

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:

     
    • Troj.Win32.TRX.XXPE50FFF038

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

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • {Encrypted Directory}\how to recover my files.hta
  • {Malware Path}\del.bat

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.MSIL.PARADISE.J. 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 the following Trend Micro Support pages for more information:

Step 6

Restore encrypted files from backup.


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