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TrojanSpy.Win32.CAMUBOT.A

September 07, 2018
 Analysis by: Noel Anthony Llimos
 ALIASES:

W32/CamuBot.A!tr (Fortinet)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


This Trojan Spy 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 certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

15,628,876 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

05 Sep 2018

Payload:

Connects to URLs/IPs, Steals information, Displays windows

Arrival Details

This Trojan Spy 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 Spy drops the following component file(s):

  • %User Temp%\protecao.exe ← Component file for its SSH Connection
  • %User Temp%\Renci.SshNet.dll ← Component file for its SSH Connection
  • %ProgramData%\m.msi ← Component file for its SSH Connection

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.. %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData in Windows Vista, 7, and 8.)

It adds the following processes:

  • msiexec /i "%ProgramData%\m.msi" /qn ADDLOCAL=ALL REMOVE=Drivers_cln_f ← Command to install its dropped configuration file
  • %System%\netsh.exe” firewall add allowedprogram “{Directory of Malware}” Anti-Virus ENABLE ← Command to add itself as trusted

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData in Windows Vista, 7, and 8.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Download Routine

This Trojan Spy connects to the following URL(s) to download its component file(s):

  • http://www.{BLOCKED}er-network.com/usb-over-network-32bit.msi

Information Theft

This Trojan Spy gathers the following data:

  • Processor Type
  • Locale Name
  • OS Version
  • OS Product Name
  • IP Address

Other Details

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

  • http://{BLOCKED}.{BLOCKED}.198.90/pan/up.php

It does the following:

  • After successfully installing its fake security module. It will pop-up a screen which redirects the victim to the following URL which is a phishing site that pretends to be a bank's online banking portal to gather the victim's credentials.
    • https://office.{BLOCKED}teid.com/empresas
  • It installs a driver to establish remote connection to the infected device.

NOTES:

This trojan spy displays the following windows:


  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.486.05

FIRST VSAPI PATTERN DATE:

05 Sep 2018

VSAPI OPR PATTERN File:

14.487.00

VSAPI OPR PATTERN Date:

06 Sep 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

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.  
  • %User Temp%\protecao.exe
  • %User Temp%\Renci.SshNet.dll
  • %ProgramData%\m.msi

Step 4

Identify and terminate files detected as TrojanSpy.Win32.CAMUBOT.A

[ 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 5

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.Win32.CAMUBOT.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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