Analysis by: Jayvee Mark Villaroman
ALIASES:

Win64/PSW.SneakyStealer_AGen.B (NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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

This Trojan Spy 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: 1,847,287 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 20 Apr 2023
Payload: Drops files, Steals information

Arrival Details

This Trojan Spy 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 Spy drops the following files:

  • %User Temp%\{Compromised browser}\Administrator#History.csv
  • %User Temp%\{Compromised browser}\Administrator#LoginData.csv
  • %User Temp%\Microsoft Edge\SS_ErrorLog.txt
  • %User Temp%\Mozilla Firefox\SS_ErrorLog.txt
  • %User Temp%\Yandex Browser\SS_ErrorLog.txt
  • %User Temp%\Chromium\SS_ErrorLog.txt
  • %User Temp%\Chrome Beta\SS_ErrorLog.txt
  • %User Temp%\Google Chrome\S_ErrorLog.txt
  • %AppDataLocal%\{Compromised browser}\User Data\Default\History_copy_
  • %AppDataLocal%\{Compromised browser}\User Data\Default\Login Data_copy_
  • %AppDataLocal%\{Compromised browser}\User Data\Default\Web Data_copy_

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

Information Theft

This Trojan Spy gathers the following data:

  • Stored credentials, history, and etc. from the following browsers:
    • Google Chrome
    • Microsoft Edge
    • Mozilla Firefox
    • Chromium
    • Chrome Beta
    • Yandex Browser
  • Information related to installed mailed clients
    • HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\User\{User ID}

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 18.396.04
FIRST VSAPI PATTERN DATE: 20 Apr 2023
VSAPI OPR PATTERN File: 18.397.00
VSAPI OPR PATTERN Date: 21 Apr 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:

    • TROJ.Win32.TRX.XXPE50FFF067

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.
  • %User Temp%\{Compromised browser}\Administrator#History.csv
  • %User Temp%\{Compromised browser}\Administrator#LoginData.csv
  • %User Temp%\Microsoft Edge\SS_ErrorLog.txt
  • %User Temp%\Mozilla Firefox\SS_ErrorLog.txt
  • %User Temp%\Yandex Browser\SS_ErrorLog.txt
  • %User Temp%\Chromium\SS_ErrorLog.txt
  • %User Temp%\Chrome Beta\SS_ErrorLog.txt
  • %User Temp%\Google Chrome\S_ErrorLog.txt
  • %AppDataLocal%\{Compromised browser}\User Data\Default\History_copy_
  • %AppDataLocal%\{Compromised browser}\User Data\Default\Login Data_copy_
  • %AppDataLocal%\{Compromised browser}\User Data\Default\Web Data_copy_

Step 5

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.Win64.STEALDEAL.C. 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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