ALIASES:

Trojan:Win32/Agent.NAI (Microsoft); [00008410.EXE\00009750.EXE]:Generic Dropper.sk, [00008410.EXE\00005150.EXE]:Generic Downloader.ab (McAfee); Downloader (Symantec); Trojan-Downloader.Win32.Delf.ccc (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 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: 532,512 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 18 Oct 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 adds the following registry entries:

HKEY_LOCAL_MACHINE
SOFTWARE\Classes\IrfanView = "IrfanView"

HKEY_LOCAL_MACHINE
SOFTWARE\Classes\IrfanView\shell\open\command = "{malware path and file name}ÿ %1"

HKEY_CLASSES_ROOT
Applications\i_view32.exe\shell\open\command = "{malware path and file name}ÿ %1"

Dropping Routine

This file infector drops the following files:

  • {malware path and file name}ÿ
  • %User Temp%\20061208.exe

(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.)

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

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_LOCAL_MACHINE
    • SOFTWARE\Classes\IrfanView = "IrfanView"
  • In HKEY_LOCAL_MACHINE
    • SOFTWARE\Classes\IrfanView\shell\open\command = "{malware path and file name}ÿ %1"
  • In HKEY_CLASSES_ROOT
    • Applications\i_view32.exe\shell\open\command = "{malware path and file name}ÿ %1"

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.
  • {malware path and file name}ÿ
  • %User Temp%\20061208.exe

Step 4

Scan your computer with your Trend Micro product to clean files detected as PE_GINWUI.AP. 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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