TrojanSpy.MSIL.ENGIMASTEALER.YXDBC

February 21, 2023
 Analysis by: Jayvee Mark Villaroman
 ALIASES:

MSIL/Generic.AP.3B77C!tr (FORTINET)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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:

10,752 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

03 Feb 2023

Payload:

Connects to URLs/IPs, Modifies system registry, 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.

Other System Modifications

This Trojan Spy adds the following registry entries:

HKEY_LOCAL_MACHINE\Software\Microsoft
Cryptography = {MachineGUID}

Download Routine

This Trojan Spy connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}.{BLOCKED}.146.29/errlog/gate.php?hwid={MachineGUID}&filename=loader&nStr=1&desc=[sharp]{DebugMessage}
  • https://api.telegram.org/{BLOCKED}tToken}/getfile?file_id={fileID}
  • https://api.telegram.org/{BLOCKED}tToken}/getUpdates

Other Details

This Trojan Spy does the following:

  • It utilizes Telegram API in sending stolen information.
  • It sends stolen information to: https://api.telegram.org/{BLOCKED}tToken}/sendmessage?chat_id={ChatID}&text[{MachineGUID}]{message}
  • It sends an "alivereply" and "i'm alive" chat message to the specified Telegram bot every 300 seconds, to inform the threat actor of its activity.
  • It downloads an assembly file from Telegram and executes it (downloaded files behavior varies).
  • It steals tokens and passwords stored in the following web browsers:
    • Chromium
    • Google Chrome
    • Opera
    • Iridium
    • 7Star
    • CentBrowser
    • Chedot
    • Vivaldi
    • Kometa
    • Elements
    • Epic
    • Sleipnir
    • Citrio
    • Coowon
    • liebao
    • QIP Surf
    • Orbutym
    • Comodo
    • Amigo
    • Torch
    • Yandex
    • 360Browser
    • Maxthon
    • K-Melon
    • CocCoc
    • Brave
    • Microsoft Edge

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.234.04

FIRST VSAPI PATTERN DATE:

03 Feb 2023

VSAPI OPR PATTERN File:

18.235.00

VSAPI OPR PATTERN Date:

04 Feb 2023

Step 1

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 2

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\Software\Microsoft\
    • Cryptography = {MachineGUID}



Step 3

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.MSIL.ENGIMASTEALER.YXDBC. 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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