JS_BANLOAD.RSG

April 11, 2017
 Analysis by: Byron Jon Gelera
 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:

Downloaded from the Internet, Dropped by other malware

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 may be dropped by other malware.

It does not have any propagation routine.

It does not have any backdoor routine.

It executes downloaded files whose malicious routines are exhibited by the affected system. As of this writing, the said sites are inaccessible.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

16,412 bytes

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

05 Apr 2017

Payload:

Connects to URLs/IPs

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 may be dropped by the following malware:

  • TROJ_DRPPR.MJSP

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

This Trojan accesses the following websites to download files:

  • https://{BLOCKED}626q.nl?a&={random numbers}
  • https://{BLOCKED}626q.nl?b&={random numbers}
  • https://{BLOCKED}626q.nl?c&={random numbers}
  • https://{BLOCKED}626q.nl?d&={random numbers}
  • https://{BLOCKED}626q.nl?h&={random numbers}

It saves the files it downloads using the following names:

  • %Application Data%\{Random filename}.exe
  • %Application Data%\{Random Folder name}\{Random filename}.exe
  • %Application Data%\{Random Folder name}\{filename1}
  • %Application Data%\{Random Folder name}\{filename2}
  • %Application Data%\{Random Folder name}\{filename3}
    {filename1,2,3} are based from the URL

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It executes downloaded files :

  • %Application Data%\{Random filename}.exe
  • %Application Data%\{Random Folder name}\{Random filename}.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

whose malicious routines are exhibited by the affected system.

As of this writing, the said sites are inaccessible.

Other Details

This Trojan connects to the following website to send and receive information:

  • https://{BLOCKED}626q.nl?t&={random numbers}
  • https://{BLOCKED}626q.nl?e&={random numbers}
  • https://{BLOCKED}626q.nl?f&={random numbers}
  • https://{BLOCKED}626q.nl?g&={random numbers}

It does the following:

  • It checks if the affected machine is in Brazil by accessing the following URL:
    • http://ip-api.com/json
  • It checks if the following file exist:
    • %Program Files%\GbPlugin\gbieh.dll
    • %Program Files%\GbPlugin\gbiehcef.dll
    • %Program Files%\GbPlugin\gbiehuni.dll
    • %Program Files%\GbPlugin\gbiehabn.dll
    • %Program Files%\GbPlugin\gbiehscd.dll
  • It checks if the following folder exist:
    • %Program Files%\scpbrad
    • %Program Files%\AppBrad
    • %Program Files%\Trusteer\Rapport
    • %AppDataLocal%\Aplicativo Itau
    • %System Root%\Sicoobnet
  • It will not proceed with its routine if the country is not Brazil and the mentioned files or folders does not exist.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.332.05

FIRST VSAPI PATTERN DATE:

10 Apr 2017

VSAPI OPR PATTERN File:

13.333.00

VSAPI OPR PATTERN Date:

11 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 that dropped/downloaded JS_BANLOAD.RSG. (Note: Please skip this step if the threat(s) listed below have already been removed.)

Step 3

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 4

Search and delete these files

[ 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.  
  • %Application Data%\{Random filename}.exe
  • %Application Data%\{Random Folder name}\{Random filename}.exe
  • %Application Data%\{Random Folder name}\{filename1}
  • %Application Data%\{Random Folder name}\{filename2}
  • %Application Data%\{Random Folder name}\{filename3}

Step 5

Scan your computer with your Trend Micro product to delete files detected as JS_BANLOAD.RSG. 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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