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PE_VIRUT.ENP

October 12, 2012
 ALIASES:

Virus:Win32/Virut.BN (Microsoft); W32/Virut.n.gen (McAfee); W32.Virut.CF (Symantec); Virus.Win32.Virut.ce (Kaspersky); Virus.Win32.Virut.ce (v) (Sunbelt); Win32.Virtob.Gen.12 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This file infector 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:

169,744 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

06 Apr 2012

Arrival Details

This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other System Modifications

This file infector modifies the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop\
WindowMetrics
Shell Icon Size = "48"

(Note: The default value data of the said registry entry is 32.)

HKEY_CURRENT_USER\Control Panel\Desktop\
WindowMetrics
Shell Icon Size = "64"

(Note: The default value data of the said registry entry is 32.)

Dropping Routine

This file infector drops the following files:

  • %User Profile%\My Documents\MySettings.acw

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} 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

Restore this modified 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\Control Panel\Desktop\WindowMetrics
    • From: Shell Icon Size = "48"
      To: Shell Icon Size = ""32""
  • In HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics
    • From: Shell Icon Size = "64"
      To: Shell Icon Size = ""32""

Step 3

Search and delete this file

[ 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 Profile%\My Documents\MySettings.acw

Step 4

Scan your computer with your Trend Micro product to clean files detected as PE_VIRUT.ENP. 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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