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Trojan.JS.SHELLOAD.AB

January 10, 2020
 Analysis by: Warren Adam Sto. Tomas
 ALIASES:

JS:Exploit.Sharpshooter.C (BitDefender)

 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 may be hosted on a website and run when a user accesses the said website.

  TECHNICAL DETAILS

File Size:

36,773 bytes

File Type:

HTA

Memory Resident:

Yes

Initial Samples Received Date:

08 Jan 2020

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:

  • Trojan.HTML.SHELLOAD.AA

It may be hosted on a website and run when a user accesses the said website.

Other Details

This Trojan does the following:

  • It terminates itself if:
    • the affected system's domain name is "foo"
    • It finds the following sandbox artifacts in the affected system:
      • C:\windows\Sysnative\Drivers\Vmmouse.sys
      • C:\windows\Sysnative\Drivers\vm3dgl.dll
      • C:\windows\Sysnative\Drivers\vmdum.dll
      • C:\windows\Sysnative\Drivers\vm3dver.dll
      • C:\windows\Sysnative\Drivers\vmtray.dll
      • C:\windows\Sysnative\Drivers\vmci.sys
      • C:\windows\Sysnative\Drivers\vmusbmouse.sys
      • C:\windows\Sysnative\Drivers\vmx_svga.sys
      • C:\windows\Sysnative\Drivers\vmxnet.sys
      • C:\windows\Sysnative\Drivers\VMToolsHook.dll
      • C:\windows\Sysnative\Drivers\vmhgfs.dll
      • C:\windows\Sysnative\Drivers\vmmousever.dll
      • C:\windows\Sysnative\Drivers\vmGuestLib.dll
      • C:\windows\Sysnative\Drivers\VmGuestLibJava.dll
      • C:\windows\Sysnative\Drivers\vmscsi.sys
      • C:\windows\Sysnative\Drivers\VBoxMouse.sys
      • C:\windows\Sysnative\Drivers\VBoxGuest.sys
      • C:\windows\Sysnative\Drivers\VBoxSF.sys
      • C:\windows\Sysnative\Drivers\VBoxVideo.sys
      • C:\windows\Sysnative\vboxdisp.dll
      • C:\windows\Sysnative\vboxhook.dll
      • C:\windows\Sysnative\vboxmrxnp.dll
      • C:\windows\Sysnative\vboxogl.dll
      • C:\windows\Sysnative\vboxoglarrayspu.dll
      • C:\windows\Sysnative\vboxoglcrutil.dll
      • C:\windows\Sysnative\vboxoglerrorspu.dll
      • C:\windows\Sysnative\vboxoglfeedbackspu.dll
      • C:\windows\Sysnative\vboxoglpackspu.dll
      • C:\windows\Sysnative\vboxoglpassthroughspu.dll
      • C:\windows\Sysnative\vboxservice.exe
      • C:\windows\Sysnative\vboxtray.exe
      • C:\windows\Sysnative\VBoxControl.exe
    • the affected system's Mac Address contains the following:
      • 000C29
      • 001C14
      • 005056
      • 000569
      • 080027
    • it is being debugged
  • It will try to execute a shell code, however the shell code is damaged or incomplete

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.608.03

FIRST VSAPI PATTERN DATE:

08 Jan 2020

VSAPI OPR PATTERN File:

15.609.00

VSAPI OPR PATTERN Date:

09 Jan 2020

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Identify and terminate files detected as Trojan.JS.SHELLOAD.AB

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Scan your computer with your Trend Micro product to delete files detected as Trojan.JS.SHELLOAD.AB. 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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