Analysis by: Cris Nowell Pantanilla

ALIASES:

a variant of MSIL/TrojanDownloader.Agent.CXV (ESET-NOD32)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size: 305,152 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 13 Mar 2017

Arrival Details

This Trojan may be downloaded from the following remote sites:

  • http://ibot.{BLOCKED}ns.me/installer.exe
  • http://{BLOCKED}red-apps.com/ibot/installer.exe

Installation

This Trojan creates the following folders:

  • %System Root%\users\public\iBot

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

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Microsoft Drivers = ""%System Root%\users\public\iBot\Adobe.exe""

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Microsoft windows updates = ""%System Root%\users\public\iBot\svchostex.exe""

Download Routine

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

  • http://ibot.{BLOCKED}ns.me/client.exe
  • http://{BLOCKED}red-apps.com/ibot/client.exe
  • http://{BLOCKED}red-apps.com/ibot/installer.exe
  • http://ibot.{BLOCKED}ns.me/installer.exe

It saves the files it downloads using the following names:

  • %System Root%\users\public\iBot\Adobe.exe (installer.exe)
  • %System Root%\users\public\iBot\svchostex.exe (client.exe)

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

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

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

  • http://ibot.{BLOCKED}ns.me/config.ini
  • http://{BLOCKED}red-apps.com/ibot/config.ini

It does the following:

  • The "config.ini" contains the following information which it uses to report back to remote malware user via SMTP:
    • Recipient
    • Sender
    • Password
  • It uses the SMTP server "smtp.gmail.com" to report its installation to the remote malicious user.

  SOLUTION

Minimum Scan Engine: 9.850

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

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Microsoft Drivers = ""%System Root%\users\public\iBot\Adobe.exe""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Microsoft windows updates = ""%System Root%\users\public\iBot\svchostex.exe""

Step 3

Search and delete this folder

[ 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. %System Root%\users\public\iBot

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.
%System Root%\users\public\iBot\Adobe.exe (installer.exe)
%System Root%\users\public\iBot\svchostex.exe (client.exe)

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_IBOT.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 this Knowledge Base page for more information.


Did this description help? Tell us how we did.