ALIASES:

Trojan:Win32/Sisron (Microsoft); BackDoor-DRV.gen.c (McAfee); Backdoor.Trojan (Symantec); ARC:Embedded, [script.fly]:Trojan.Win32.FlyStudio.abg (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan:W32/Agent.DQOD (FSecure)

 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.

  TECHNICAL DETAILS

File Size: 1,022,120 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 14 Nov 2011

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 copies of itself into the affected system:

  • %System%\svchoct.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It creates the following folders:

  • %User Temp%\E_N4

(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.)

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\E_N4\krnln.fnr
  • %User Temp%\E_N4\eAPI.fne
  • %User Temp%\E_N4\eImgConverter.fne
  • %User Temp%\E_N4\shell.fne
  • %User Temp%\E_N4\PBShell.fne

(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.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

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. %User Temp%\E_N4

Step 3

Search and delete these files

[ Learn More ]
There may be some component 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%\E_N4\krnln.fnr
  • %User Temp%\E_N4\eAPI.fne
  • %User Temp%\E_N4\eImgConverter.fne
  • %User Temp%\E_N4\shell.fne
  • %User Temp%\E_N4\PBShell.fne

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_GE.USEKB25. 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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