Trojan.Win32.SODINSTALL.YABGC

July 04, 2021
 Analysis by: Paul Steven Nadera
 ALIASES:

UDS:Trojan-Ransom.Win32.Sodin.gen (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Trojan 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:

912,264 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

02 Jul 2021

Payload:

Drops files

Arrival Details

This Trojan 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 Trojan drops the following files:

  • %Windows%\mpsvc.dll (if file creation fails, drops %User Temp%\mpsvc.dll instead) -> Malicious DLL file to be sideloaded, detected as Ransom.Win32.SODINOKIBI.YABGC
  • %Windows%\MsMpEng.exe (if file creation fails, drops %User Temp%\MsMpEng.exe instead) -> normal executable file used to sideload the malicious DLL

It adds the following processes:

  • %Windows%\MsMpEng.exe (or %User Temp%\MsMpEng.exe, depending on what was successfully created)

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

16.818.05

VSAPI OPR PATTERN File:

16.819.00

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:

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

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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.
    • %Windows%\mpsvc.dll
    • %User Temp%\mpsvc.dll
    • %Windows%\MsMpEng.exe
    • %User Temp%\MsMpEng.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.SODINSTALL.YABGC. 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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