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Trojan.Win32.BLUEROH.RPG

October 09, 2019
 Modified by: Jay Bradley Nebre
 ALIASES:

VirTool:Win32/CeeInject.SN!bit [non_writable_container] (Microsoft); RDN/Generic Downloader.x (McAfee); Troj/Agent-AWJO (Sophos); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

92,160 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Oct 2019

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.

Installation

This Trojan drops the following copies of itself into the affected system and executes them:

  • %User Temp%\{random numbers}\TemporaryFile\TemporaryFile

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It drops the following files:

  • C:\WebKit\2.50.98\amydesk.exe(download) - slightly modified copy
  • %Windows%\System32\{random characters}.exe - slightly modified copy
  • %Windows%\system32\{random numbers}.bak - slightly modified copy

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

It creates the following folders:

  • C:\WebKit
  • C:\WebKit\2.50.98
  • %User Temp%\{random numbers}\TemporaryFile

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Download Routine

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

It saves the files it downloads using the following names:

  • C:\Windows\{random characters}\{random characters}.exe

Other Details

This Trojan deletes itself after execution.

It adds the following scheduled tasks:

  • Task Name: hticccqhe
    Trigger: repeat every 00:01:00 indefinitely
    Task to be run: cmd /c C:\Windows\Fonts\{random charactes}.exe

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.408.04

FIRST VSAPI PATTERN DATE:

04 Oct 2019

VSAPI OPR PATTERN File:

15.409.00

VSAPI OPR PATTERN Date:

05 Oct 2019

Step 1

Trend Micro products with the XGen technology detect this malware as

[ Learn More ]
 Troj.Win32.TRX.XXPE50FFF032

Step 2

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 3

Identify and terminate files detected as Trojan.Win32.BLUEROH.RPG

[ 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 4

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:\WebKit
  • C:\WebKit\2.50.98
  • %User Temp%\{random numbers}\TemporaryFile

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.BLUEROH.RPG. 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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