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WORM_AUTORUN.SMW
Aliases: Backdoor:Win32/FlyAgent.F (Microsoft); W32/Autorun.worm.ev (McAfee); W32.SillyFDC (Symantec); PAK:PE-Crypt.CF, ARC:Embedded, [script.fly]:Trojan-Downloader.Win32.FlyStudio.kx, PAK:[krnln.fnr]:PE (Kaspersky); Trojan.Win32.Autorun.dm (v) (Sunbelt); Trojan-Dropper:W32/Peed.gen!A (FSecure)
Malware type: Worm
Destructive: No
Platform: Windows 2000, Windows XP, Windows Server 2003
In the wild: Yes

Overview


This worm 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: 1,407,227 bytes
File type: EXE
Memory resident: No
Initial samples received date: 04 Nov 2011

Arrival Details

This worm 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 worm creates the following folders:

  • %User Temp%\E_N4
  • %System%\372109\
  • %System%\499E86\
  • %System%\2B4FA4\
  • %System%\A9C3FF\

(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 and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

Dropping Routine

This worm drops the following files:

  • %User Temp%\E_N4\krnln.fnr
  • %User Temp%\E_N4\HtmlView.fne
  • %User Temp%\E_N4\internet.fne
  • %User Temp%\E_N4\eAPI.fne
  • %User Temp%\E_N4\dp1.fne
  • %User Temp%\E_N4\shell.fne
  • %User Temp%\E_N4\spec.fne
  • %User Temp%\E_N4\cnvpe.fne
  • %System%\372109\C00285.EXE
  • %System%\499E86\RegEx.fnr
  • %User Startup%\C00285.lnk
  • %System%\499E86\cnvpe.fne
  • %System%\499E86\dp1.fne
  • %System%\499E86\eAPI.fne
  • %System%\499E86\HtmlView.fne
  • %System%\499E86\internet.fne
  • %System%\499E86\krnln.fnr
  • %System%\499E86\shell.fne
  • %System%\499E86\spec.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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

This report is generated via an automated analysis system.

Solution


Minimum scan engine: 9.200

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

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.
  • %User Temp%\E_N4
  • %System%\372109\
  • %System%\499E86\
  • %System%\2B4FA4\
  • %System%\A9C3FF\

Step 3

Search and delete these components

[ Learn more ]
There may be some components 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\HtmlView.fne
  • %User Temp%\E_N4\internet.fne
  • %User Temp%\E_N4\eAPI.fne
  • %User Temp%\E_N4\dp1.fne
  • %User Temp%\E_N4\shell.fne
  • %User Temp%\E_N4\spec.fne
  • %User Temp%\E_N4\cnvpe.fne
  • %System%\372109\C00285.EXE
  • %System%\499E86\RegEx.fnr
  • %User Startup%\C00285.lnk
  • %System%\499E86\cnvpe.fne
  • %System%\499E86\dp1.fne
  • %System%\499E86\eAPI.fne
  • %System%\499E86\HtmlView.fne
  • %System%\499E86\internet.fne
  • %System%\499E86\krnln.fnr
  • %System%\499E86\shell.fne
  • %System%\499E86\spec.fne

Step 4

Scan your computer with your Trend Micro product to delete files detected as WORM_AUTORUN.SMW. 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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Analysis By: Automation

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