TROJ_FAKEAV.AOD

October 08, 2012
 Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan deletes itself after execution.

  TECHNICAL DETAILS

File Size:

409,088 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

16 Mar 2011

Installation

This Trojan drops the following files:

  • {malware path}\{malware file name}
  • %System Root%\Documents and Settings\All Users\Application Data\nKaLaNo16638\nKaLaNo16638.exe - detected as TROJ_FAKEAV.SMID

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

  • %System Root%\Documents and Settings\All Users\Application Data\nKaLaNo16638
  • %System Root%\Documents and Settings\All Users\Application Data\nKaLaNo16638\nKaLaNo16638

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
nKaLaNo16638 = "%System Root%\Documents and Settings\All Users\Application Data\nKaLaNo16638\nKaLaNo16638.exe"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.113.214/lurl.php?affid=16638
  • http://{BLOCKED}.194.40/install.php?affid=16638

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

8.900

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

Remove malware files dropped/downloaded by TROJ_FAKEAV.AOD

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\RunOnce
    • nKaLaNo16638 = "%System Root%\Documents and Settings\All Users\Application Data\nKaLaNo16638\nKaLaNo16638.exe"

Step 4

Search and delete this folder

[ 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.
  • %System Root%\Documents and Settings\All Users\Application Data\nKaLaNo16638
  • %System Root%\Documents and Settings\All Users\Application Data\nKaLaNo16638\nKaLaNo16638

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.AOD. 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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