Analysis by: Wilbert Vidal
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: Yes

  • Encrypted: No

  • 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: 5,410,816 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 28 May 2018
Payload: Overwriters Master Boot Record

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.

Installation

This Trojan drops the following files:

  • C:\Users\{User Name}\AppData\Local\Temp\nsd6ACD.tmp\System.dll -> Deleted Afterwards

It creates the following folders:

  • C:\Users\{User Name}\AppData\Local\Temp\nsd6ACD.tmp - Deleted Afterwards

Other Details

This Trojan does the following:

  • Wipes Master Boot Record Data
    • It overwrites the portion of the physical drives with null values
  • Performs Shutdown

NOTES:

This Trojan requires to run on a specific machine to perform its intended routine.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.280.02
FIRST VSAPI PATTERN DATE: 28 May 2018
VSAPI OPR PATTERN File: 14.281.00
VSAPI OPR PATTERN Date: 29 May 2018

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

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • C:\Users\{User Name}\AppData\Local\Temp\nsd6ACD.tmp

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_KILLMBR.EE. 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:


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