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Trojan.Win64.SMOKELOADER.SM

March 21, 2023
 Analysis by: Bryelle Timothy Nisperos
 ALIASES:

Trojan.Win32.Cobalt.faf (KASPERSKY), Trojan:Win64/Cobaltstrike.PAB!MTB (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware


This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

792,064 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

20 Mar 2023

Payload:

Drops files, Steals information, Connects to URLs/IPs

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This Trojan drops the following files:

  • DEM{4 random characters}.tmp

It adds the following processes:

  • cmd.exe /c echo UOdSilBUzSKXpsw>"%User Temp%\DEM{4 random characters}.tmp"&exit

(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).)

Backdoor Routine

This Trojan connects to the following websites to send and receive information:

  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.209/mobile-ipad-home
  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.209/RELEASE_NOTES
  • http://{BLOCKED}d.com/mobile-ipad-home
  • http://{BLOCKED}d.com/RELEASE_NOTES

Information Theft

This Trojan gathers the following data:

  • Computer Name
  • OS Version
  • Username

Other Details

This Trojan does the following:

  • It tries to load repudiandaeoditsimiliquesaepe28.dll if found in the system
  • It can connect and disconnect named pipe
  • It can escalate privileges
  • It can impersonate user tokens

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

16.272.05

FIRST VSAPI PATTERN DATE:

07 Oct 2020

VSAPI OPR PATTERN File:

16.273.00

VSAPI OPR PATTERN Date:

08 Oct 2020

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.XXPE50FFF066

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

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%\DEM{4 random characters}.tmp

Step 4

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win64.SMOKELOADER.SM. 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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