Analysis by: Thea Patrice Tajonera
ALIASES:

Ransom:Win32/Rolsig.A (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • 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.

  TECHNICAL DETAILS

File Size: 979,968 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 02 May 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 drops the following files:

  • {Malware Path}\log.txt -> contains logs associated with the malware

Other Details

Based on analysis of the codes, it has the following capabilities:

  • Spawn process FreeSpaceWorker.exe

It does the following:

  • This Ransomware requires to be ran with the following parameters in order to proceed with its malicious routine:
    • -s serverip -p port
  • It attempts to connect with the server provided in the parameter
  • It creates a window named "Windows Update"
  • The malware attempts to access a user key, and generates a new one if it is not there, in the following :
    • "pippo container"
    • "pippo container client"
  • This Ransomware will not proceed to its ransomware routine unless its client-server connection is properly established

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.694.08
FIRST VSAPI PATTERN DATE: 03 May 2021
VSAPI OPR PATTERN File: 16.695.00
VSAPI OPR PATTERN Date: 04 May 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.XXPE50FFF043

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.
  • {Malware Path}\log.txt

Step 5

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