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PE_NEMIM.A

October 24, 2013
 Modified by: Alvin Bacani
 ALIASES:

Virus:Win32/Nemim.A (Microsoft); Generic BackDoor.aez (McAfee); Virus.Win32.Suspic.gen (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); May be infected by unknown virus Win32/DH{DwA} (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This file infector may arrive bundled with malware packages as a malware component. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any file infection routine.

It deletes registry entries, causing some applications and programs to not function properly.

  TECHNICAL DETAILS

File Size:

277,320 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

24 Feb 2013

Arrival Details

This file infector may arrive bundled with malware packages as a malware component.

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

Infection Points

This file infector does not have any file infection routine.

Installation

This file infector drops the following component file(s):

  • %Application Data%\Microsoft\Display\igfxext.exe - detected as TROJ_NEMIM.A

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

Autostart Technique

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

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
igfxext.exe = "%Application Data%\Microsoft\Display\igfxext.exe /265"

Other System Modifications

This file infector deletes the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
tintsetp.exe = {file path and filename}

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

10.358.03

FIRST VSAPI PATTERN DATE:

22 Oct 2013

VSAPI OPR PATTERN File:

10.359.00

VSAPI OPR PATTERN Date:

23 Oct 2013

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

Remove the malware/grayware file that dropped/downloaded PE_NEMIM.A

    • TROJ_NEMIM.A

Step 3

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\CurrentVersion\Run
    • igfxext.exe = "%Application Data%\Microsoft\Display\igfxext.exe /265"

Step 4

Scan your computer with your Trend Micro product to clean files detected as PE_NEMIM.A. 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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