Analysis by: Michael Jhon Ofiaza
ALIASES:

Trojan-Downloader.VBS.BitMin.d (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Coinminer

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This Coinminer 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: 15,545 bytes
File Type: VBS
Memory Resident: No
Initial Samples Received Date: 19 Jul 2018
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

This Coinminer 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 Coinminer adds the following processes:

  • cmd.exe /c set &&ping -n 10 127.0.0.1 $$start %All Users Profile%\yuitopk.exe

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000, XP, and Server 2003, or C:\ProgramData on Windows Vista, 7, and 8. )

Download Routine

This Coinminer downloads the file from the following URL and renames the file when stored in the affected system:

  • http://www.{BLOCKED}3.usa.cc/imageee.gif

It saves the files it downloads using the following names:

Other Details

This Coinminer does the following:

  • Opens the browser to access the following URL:
    • http://www.facebook.com

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.630.06
FIRST VSAPI PATTERN DATE: 16 Nov 2018
VSAPI OPR PATTERN File: 14.631.00
VSAPI OPR PATTERN Date: 17 Nov 2018

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

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 3

Search and delete these files

[ 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.  
  • %All Users Profile%\yuitopk.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as Trojan.VBS.MALXMY.THAAADAH. 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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