Analysis by: Arvin Roi Macaraeg
ALIASES:

TrojanDownloader:O97M/Donoff(MICROSOFT), VBA/Agent.DN trojan(NOD32), Trojan.Mdropper(NORTON)

 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: Dropped by other malware, Downloaded from the Internet

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.

  TECHNICAL DETAILS

File Size: 140,800 bytes
File Type: XLS
Memory Resident: Yes
Initial Samples Received Date: 19 Feb 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.

Other Details

This Trojan does the following:

  • This Trojan connects to the following website(s) to download and execute a script:
    • http://{BLOCKED}osting.biz/images/2019/02/14/in1.png
    • http://images2.{BLOCKED}am.com/f1/b1/50/dd7e561126561184.png
    • https://{BLOCKED}r.co/img/w84vm.png
    • https://images2.{BLOCKED}x.com/34/60/1Zc8BevK_o.png
    • http://oi68.{BLOCKED}c.com/2saxhrc.jpg
    • https://{BLOCKED}nap.com/i/aqiAmg1b.png?0214
    • https://i.{BLOCKED}g.cc/0jFwGVb3/l1.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.

NOTES:

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

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.822.05
FIRST VSAPI PATTERN DATE: 18 Feb 2019
VSAPI OPR PATTERN File: 14.823.00
VSAPI OPR PATTERN Date: 19 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.X97M.POWLOAD.NSFGAIDM. 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 ]


Did this description help? Tell us how we did.