Analysis by: Jennifer Gumban
ALIASES:

TrojanDropper:JS/Tetomek.A (Microsoft); JS/Drop-MP (Sophos)

 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, Spammed via email

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

  TECHNICAL DETAILS

File Size: 871,779 bytes
File Type: JS
Memory Resident: No
Initial Samples Received Date: 23 Apr 2017
Payload: Drops 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.

It arrives as an attachment to the following email messages spammed by other malware/grayware or malicious users:

  • The malware arrives as an embedded file on a document.

Installation

This Trojan drops and executes the following files:

  • %User Profile%\Documents\l.exe ← detected as TSPY_EMOTET.GQA

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.350.07
FIRST VSAPI PATTERN DATE: 19 Apr 2017
VSAPI OPR PATTERN File: 13.351.00
VSAPI OPR PATTERN Date: 20 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

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 3

Remove malware/grayware files dropped/downloaded by JS_EMOTET.GQA. (Note: Please skip this step if the threats listed below have already been removed.)

     
    • TSPY_EMOTET.GQA

Step 4

Scan your computer with your Trend Micro product to delete files detected as JS_EMOTET.GQA. 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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