Trojan.W97M.POWLOAD.TIHAOHBF

February 07, 2019
 Analysis by: Maureen Reyes
 ALIASES:

Trojan:O97M/Obfuse.BH (Microsoft), W97M/Downloader!462C85421E7E (McAfee)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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:

167,936 bytes

File Type:

DOC

Memory Resident:

No

Initial Samples Received Date:

04 Feb 2019

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.

Installation

This Trojan adds the following processes:

  • powershell.exe -NoP -Exec Bypass -EC {Base64 encoded powershell command}

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.band/xap-{BLOCKED}-AZ1/704e.php?l=zyteb12.gas

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

  SOLUTION

Minimum Scan Engine:

9.850

VSAPI OPR PATTERN File:

14.797.00

VSAPI OPR PATTERN Date:

06 Feb 2019

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as Trojan.W97M.POWLOAD.TIHAOHBF. 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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