Analysis by: Maureen Reyes
ALIASES:

TrojanDownloader:O97M/Obfuse.IF!MTB (Microsoft), HEUR:Trojan.MSOffice.Stratos.gen (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 35,328 bytes
File Type: XLS
Memory Resident: No
Initial Samples Received Date: 22 Aug 2019
Payload: Connects to URLs/IPs

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://bit.ly/{BLOCKED}udah
  • http://bit.ly/{BLOCKED}c/graphics/{BLOCKED}04.png
  • http://bit.ly/{BLOCKED}c/graphics/{BLOCKED}04.png
  • http://bit.ly/{BLOCKED}c/graphics/{BLOCKED}-404.png
  • http://bit.ly/{BLOCKED}c/graphics/{BLOCKED}-404.png
  • http://bit.ly/{BLOCKED}c/graphics/{BLOCKED}4.png

Other Details

This Trojan does the following:

  • When user opens the word file, it will connect to above website and macro script will be executed even the macro is disabled or enabled.

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.312.02
FIRST VSAPI PATTERN DATE: 21 Aug 2019
VSAPI OPR PATTERN File: 15.313.00
VSAPI OPR PATTERN Date: 22 Aug 2019

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

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 3

Enable the macro virus protection in Microsoft Office Applications

[ Learn More ]

Step 4

Scan your computer with your Trend Micro product to delete files detected as Trojan.X97M.DLOADR.TIOIBEFV. 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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