TROJ_INJECTOR.BNI

October 09, 2012
 Analysis by: Nikko Tamana
 ALIASES:

Mal/EncPk-ACW (Sophos), Trojan.Win32.Tobfy (Ikarus), a variant of Win32/Injector.WQU trojan (NOD32)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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 executes then deletes itself afterward.

It connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.

  TECHNICAL DETAILS

File Size:

201,216 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

17 Sep 2012

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 and executes the following files:

  • %System Root%\systemx.Bin\76393F7DB{random}.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

  • %System Root%\systemx.Bin

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It executes then deletes itself afterward.

Download Routine

This Trojan connects to the following malicious URLs:

  • {BLOCKED}1.org

NOTES:

TROJ_INJECTOR.BNI deletes the file config.bin in ZBOT_tool folder if present. Its dropped file also deletes itself after execution as well as the folder where it is located.