Analysis by: Maureen Reyes
 Modified by: Arvin Roi Macaraeg
ALIASES:

TrojanDownloader:O97M/Donoff(MICROSOFT); DOC/Agent.DZ(ESET-NOD32);

 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: Downloaded from the Internet, Dropped by other malware

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

It does not have any propagation routine.

It does not have any backdoor routine.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size: 87,552 bytes
File Type: XLS
Memory Resident: No
Initial Samples Received Date: 18 Jun 2019
Payload: Connects to URLs/IPs, Executes files

Arrival Details

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

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Rootkit Capabilities

This Trojan does not have rootkit capabilities.

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

This Trojan does the following:

  • Connects to the following URLs to download and execute a script:
    • https://{BLOCKED}2.img/a9/wH2ykZbz_o.png
    • https://i.imgur.com/{BLOCKED}h.png
  • The document contains the following message details luring users to enable macro content:
  • It proceeds with its malicious routines if the language setting of the affected machine is set to Japanese.
  • It displays the following message box as an indicator that the macro code was completely executed:

NOTES:

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

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.182.03
FIRST VSAPI PATTERN DATE: 18 Jun 2019
VSAPI OPR PATTERN File: 15.183.00
VSAPI OPR PATTERN Date: 19 Jun 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

Scan your computer with your Trend Micro product to delete files detected as Trojan.X97M.DLOADR.TIOIBEEF. 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 3

Enable the macro virus protection in Microsoft Office Applications

[ Learn More ]


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