Analysis by: Cris Nowell Pantanilla
ALIASES:

TrojanDropper:JS/Tergro.A (Microsoft), Trojan-Downloader.JS.Agent.nvv (Kaspersky)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Spammed via email

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

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 801,891 bytes
File Type: JS
Memory Resident: No
Initial Samples Received Date: 20 Apr 2017
Payload: Drops files

Arrival Details

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

Dropping Routine

This Trojan drops the following files:

It executes the dropped file. As a result, malicious routines of the dropped file are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.352.07
FIRST VSAPI PATTERN DATE: 20 Apr 2017
VSAPI OPR PATTERN File: 13.353.00
VSAPI OPR PATTERN Date: 21 Apr 2017

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

Remove the malware/grayware file dropped/downloaded by JS_EMOTET.GQB. (Note: Please skip this step if the threat(s) listed below have already been removed.)

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_EMOTET.GQB. 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 this Knowledge Base page for more information.


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