Analysis by: Mohammed Malubay

ALIASES:

N/A;

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: Yes

  • 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 executes then deletes itself afterward.

It requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.

It drops files as ransom note.

  TECHNICAL DETAILS

File Size: 3,281,988 bytes
File Type: EXE
Initial Samples Received Date: 24 Feb 2021
Payload: Connects to URLs/IPs, Displays message/message boxes, Encrypts files, Disables AV services, , Deletes files

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:

  • {Malware Filepath}\Go.bat "{Malware Filepath}\{Malware Filename}.exe"
  • wmic shadowcopy delete
  • bcdedit /set {default} bootstatuspolicy ignoreallfailures
  • bcdedit /set {default} recoveryenabled no
  • {Malware Filepath}\killme.bat "{Malware Filepath}\{Malware Filename}.exe"

It executes then deletes itself afterward.

Other System Modifications

This Ransomware deletes the following files:

  • {Malware Filepath}\Go.bat
  • {Malware Filepath}\killme.bat
    • {Drive Letter} are the following:
      • D:\
      • E:\
      • F:\
      • G:\
      • H:\
    • {Filename} are files that satisfies the following filters:
      • *.VHD
      • *.bac
      • *.bak
      • *.wbcat
      • *.bkf
      • *.set
      • *.win
      • *.dsk
      • Backup*.*
      • backup*.*

Process Termination

This Ransomware terminates the following services if found on the affected system:

  • Services that start with:
    • mssql
    • sql
    • postgresql
    • oracle
    • mysql
    • veeam
    • backup
    • msexchange

Dropping Routine

This Ransomware drops the following files:

  • {Malware Filepath}\Go.bat
  • {Malware Filepath}\killme.bat

Other Details

This Ransomware encrypts files with the following extensions:

  • .xlsx
  • .png
  • .fob
  • .jp?
  • .lic
  • .dcm
  • .cf?
  • .rvt
  • .cpp
  • .qb?
  • .cs
  • .sln
  • .vb
  • .xml
  • .dwg
  • .edb
  • .ndf
  • .wk
  • .xl?
  • .txt
  • .doc?
  • .md?
  • mp?
  • .sql
  • .bak
  • .ora
  • .pdf
  • .pp?
  • .dbf
  • .zip
  • .rar
  • .asp?
  • .php
  • .jsp?
  • .bk?
  • .csv
  • .7z
  • .myd
  • .ibd
  • _fsm
  • _vm
  • .db?
  • .rpt

It does the following:

  • Argument must be equal to "rsa" to proceed in encrypting files
  • It writes the following to the command prompt:
    • "What the FUck" → before the encryption routine
    • "EZ Games" → after the encryption routine

It requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.

Ransomware Routine

This Ransomware avoids encrypting files found in the following folders:

  • %Windows%

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

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

  • {BLOCKED}ackers@tutanota.com.cring

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

  • %System Root%\!!!deReadMe!!!.rtf
  • %Public%\Desktop\!!!deReadMe!!!.rtf

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.560.02
FIRST VSAPI PATTERN DATE: 25 Feb 2021
VSAPI OPR PATTERN File: 16.561.00
VSAPI OPR PATTERN Date: 26 Feb 2021

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.XXPE50FFF041

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 this file

[ Learn More ]
There may be some 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.
  • %System Root%\!!!deReadMe!!!.rtf
  • %Public%\Desktop\!!!deReadMe!!!.rtf
  • {Malware Filepath}\Go.bat
  • {Malware Filepath}\killme.bat

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.CRING.C. 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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