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WORM_VOTERAI.N
Aliases: Worm:Win32/Voterai (Microsoft); W32/Voterai.worm.b (McAfee); W32.Voterai (Symantec); ARC:NSIS, [data0001]:Trojan.NSIS.Voter.a (Kaspersky); Worm:W32/Voter.B (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: 201,448 bytes
File type: EXE
Memory resident: No
Initial samples received date: 06 Feb 2012

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 Profile%\LOCALS~1\TempX
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Profile%\TempX\nsk2.tmp
  • %System Root%\Documents and Settings
  • %System Root%\Documents and Settings\Administrator

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other System Modifications

This worm deletes the following files:

  • %User Profile%\TempX\nsu1.tmp
  • %User Profile%\TempX\nsk2.tmp

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Dropping Routine

This worm drops the following files:

  • %User Profile%\nsk2.tmp\System.dll
  • %User Profile%\DesktopXRaila Odinga.gif
  • %User Startup%\{malware file name}.lnk

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %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 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 Profile%\nsk2.tmp\System.dll
  • %User Profile%\DesktopXRaila Odinga.gif
  • %User Startup%\{malware file name}.lnk

Step 3

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 Profile%\LOCALS~1\TempX
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Profile%\TempX\nsk2.tmp
  • %System Root%\Documents and Settings
  • %System Root%\Documents and Settings\Administrator

Step 4

Scan your computer with your Trend Micro product to delete files detected as WORM_VOTERAI.N. 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.

Step 5

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Profile%\TempX\nsu1.tmp
  • %User Profile%\TempX\nsk2.tmp


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Analysis By: Automation

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