Analysis by: Cris Nowell Pantanilla
ALIASES:

Backdoor.Win32.Inject.fiv [Kaspersky], Trojan:Win32/Rimod

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 23,040 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 26 Apr 2011

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_DROPPR.CZ

Installation

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

  • %Root Dir%\Documents and Settings\All Users\Application Data\3E6D2B0B.exe

It drops and executes the following files:

  • %Root Dir%\Documents and Settings\All Users\Application Data\3E6D2B0BAB.exe
  • %Root Dir%\Documents and Settings\All Users\Application Data\3E6D2B0BAB.exe.temp

Autostart Technique

This backdoor creates the following registry entries to enable automatic execution of dropped component at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = %Root Dir%\Documents and Settings\All Users\Application Data\3E6D2B0BAB.exe,explorer.exe

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.120.10
FIRST VSAPI PATTERN DATE: 26 Apr 2011

Step 1

Remove malware files dropped/downloaded by BKDR_INJECT.BKP

     TROJ_DROPPR.CZ

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 NT\CurrentVersion\Winlogon
    • Shell = "%Root Dir%\Documents and Settings\All Users\Application Data\3E6D2B0BAB.exe,explorer.exe"

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_INJECT.BKP. 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.


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