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

Infection Channel: Dropped by other malware, 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.

  TECHNICAL DETAILS

File Size: 6,232,185 bytes
File Type: EXE
Initial Samples Received Date: 15 Jun 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.

Installation

This Trojan drops the following files:

  • %System Root%\$Recycle.Bin\S-1-3
  • %System Root%\Users\Public\Documents\{GUID}
  • %Temp%\{GUID}
  • %User Temp%\{GUID}
  • {malware path}\config.ini - configuration file
  • {malware path}\svc_client.exe.old.bak- - renamed copy of itself

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
Interval = {date}

HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
Oem = unknown

HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
Tm = {number}

HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
Uid = {hex string}

Download Routine

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

  • http://admin.{BLOCKED}onweb.com/product_file/cpuz_go2008.exe

It saves the files it downloads using the following names:

  • {malware path}\cpuz_go2008.exe (renamed to {malware filename}.exe afterwards)

NOTES:
It connects to the following website to send and receive information:

  • hxxp://{BLOCKED}e.{BLOCKED}onweb[.]com/proton/Log/logStart_cpuz.php
  • hxxp://{BLOCKED}e.{BLOCKED}onweb[.]com/proton/Log/logUpdate_cpuz.php

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.348.04
FIRST VSAPI PATTERN DATE: 29 Jun 2018
VSAPI OPR PATTERN File: 14.349.00
VSAPI OPR PATTERN Date: 30 Jun 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

Identify and terminate files detected as TROJ_DLOADR.AUSUMA

[ 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

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_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
    • Interval = {date}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
    • Oem = unknown
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
    • Tm = {number}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
    • Uid = {hex string}

Step 5

Delete this registry key

[ 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_LOCAL_MACHINE\SOFTWARE
    • NetworkMgmt

Step 6

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.  
  • {malware path}\cpuz_go2008.exe
  • {malware filename}.exe
  • %System Root%\$Recycle.Bin\S-1-3
  • %System Root%\Users\Public\Documents\{GUID}
  • %Temp%\{GUID}
  • %User Temp%\{GUID}
  • {malware path}\config.ini
  • {malware path}\svc_client.exe.old.bak-

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADR.AUSUMA. 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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