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TROJ_SCAR.NXAN

December 15, 2017
 Analysis by: John Anthony Banes
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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:

3,985,266 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

30 Nov 2017

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:

  • %WINDOWS%\BMW 6 Series Coupé.scr
  • %WINDOWS%\BMW 6 Series Coupé.dll
  • %WINDOWS%\BMW 6 Series Coupé.dat
  • %WINDOWS%\BMW 6 Series Coupé.exe

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
scrnsave.exe = "%WINDOWS%\BMW6SE~1.SCR"

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.842.06

FIRST VSAPI PATTERN DATE:

14 Dec 2017

VSAPI OPR PATTERN File:

13.843.00

VSAPI OPR PATTERN Date:

15 Dec 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

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Control Panel\Desktop
    • scrnsave.exe = "%WINDOWS%\BMW6SE~1.SCR"

Step 4

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • %WINDOWS%\BMW 6 Series Coupé.scr
  • %WINDOWS%\BMW 6 Series Coupé.dll
  • %WINDOWS%\BMW 6 Series Coupé.dat
  • %WINDOWS%\BMW 6 Series Coupé.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_SCAR.NXAN. 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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