Analysis by: Maria Emreen Viray
ALIASES:

HEUR:Trojan.Win64.Convagent.gen (KASPERSKY)

 PLATFORM:

Windows

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

  • 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 executes then deletes itself afterward.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 35,328 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 14 Aug 2021

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:

  • powershell.exe -nop -w hidden -C "$ppid = (gwmi win32_process | ? processid -eq $PID).parentprocessid; $proc = Get-Process -FileVersionInfo -Id $ppid; Stop-Process -Force -ErrorAction SilentlyContinue -Id $ppid; $buff = [byte[]]@(, 0 * 1mb); Set-Content -Path $proc.FileName -Force -Confirm:0 -Value $buff; Remove-Item -Path $proc.FileName -Force -Confirm:0 "

It executes then deletes itself afterward.

Other Details

This Ransomware connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.101.30/uploadFile.php

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.858.05
FIRST VSAPI PATTERN DATE: 22 Jul 2021
VSAPI OPR PATTERN File: 16.859.00
VSAPI OPR PATTERN Date: 23 Jul 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.XXPE50FFF046

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

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win64.LOCKBIT.SMEYGL. 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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