Analysis by: Maria Emreen Viray
 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 found in specific folders.

  TECHNICAL DETAILS

File Size: 70,650 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 27 Aug 2021
Payload: Connects to URLs/IPs, Steals information, Encrypts 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 drops the following files:

  • {Original Filename}.{Original Extension}.lock64 → encypted version of original file

Information Theft

This Ransomware gathers the following data:

  • For Registration:
    • OS Version
    • Local IP Address
    • Computer Name
    • Username
    • Public IP
  • For Encryption Process Report:
    • total number of files
    • number of files encrypted
    • number of files wiped
    • number of files ignored

Stolen Information

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

  • http://127.0.{BLOCKED}.{BLOCKED}/bots/register
    • information gathered for registration
  • http://127.0.{BLOCKED}.{BLOCKED}/bot-stat/{Computer Name}-{Username}_W{OS Version}.{Generated ID}/vgrpnm/stat
    • information gathered for encryption process report

Other Details

This Ransomware does the following:

  • It is a ransomware sample used for testing purposes
  • It complies with the following testing configuration:
    • uses loopback address as C2 server
    • does not delete original versions of encrypted files
    • does not have the following lists by default:
      • services to be stopped
      • processes to be terminated
      • files to be ignored, to be encrypted and to be prioritized in encryption
      • files to be wiped
    • does not drop a ransom note
    • reports encryption process result to C2 server
    • only targets C:\TEST\ directory

It accesses the following websites to download its configuration/component files:

  • http://127.0.{BLOCKED}.{BLOCKED}/bot/{Computer Name}-{Username}_W{OS Version}.{Generated ID}/vgrpnm/{Parameter}
    uses these {Parameter}s to retrieve the following:
    • key → encryption key from C2 server
    • services → list of services to stop
    • priority → list of prioritized files to encrypt
    • stoplist → list of files to be ignored during encryption
    • ext → list of files to be encrypted
    • wipe → list of files to be wiped
    • landing → contents of ransom note

Ransomware Routine

This Ransomware encrypts files found in the following folders:

  • C:\TEST\

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

  • .lock64

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.994.04
FIRST VSAPI PATTERN DATE: 28 Sep 2021
VSAPI OPR PATTERN File: 16.995.00
VSAPI OPR PATTERN Date: 29 Sep 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.XXPE50FFF048

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.
  • C:\TEST\{Original Filename}.{Original Extension}.lock64

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.DIAVOL.A. 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:


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