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Ransom.Win32.BLACKLOCKBIT.A

September 28, 2023
 Analysis by: Raymart Christian Yambot
 ALIASES:

TR/Crypt.XPACK.Gen7 (ANTIVIR)

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted:

  • 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.

  TECHNICAL DETAILS

File Size:

76,288 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

18 Sep 2023

Payload:

Connects to URLs/IPs, Drops files, 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:

  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\{Random Characters}
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\{Random Characters}
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\MetaData\{Random Characters}
  • %AppDataLocalLow%\Microsoft\CryptnetUrlCache\Content\{Random Characters}
  • %All Users Profile%\default.key

(Note: %AppDataLocalLow% is the LocalLow Application Data folder, which is usually C:\Users\{user name}\AppData\LocalLow on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

Other Details

This Ransomware connects to the following possibly malicious URL:

  • http://{BLOCKED}i.goog/gtsr1/ME4wTDBKMEgwRjAJBgUrDgMCGgUABBQwkcLWD4LqGJ7bE7B1XZsEbmfwUAQU5K8rJnEaK0gnhS9SZizv8IkTcT4CDQIDvFCjJ1PwkYAi7fE%3D

Ransomware Routine

This Ransomware appends the following extension to the file name of the encrypted files:

  • .{Random Characters}.Grounding Conductor.zip

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.722.04

FIRST VSAPI PATTERN DATE:

27 Sep 2023

VSAPI OPR PATTERN File:

18.723.00

VSAPI OPR PATTERN Date:

28 Sep 2023

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:

    • Ransom.Win32.TRX.XXPE50FFF073

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

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