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HTML_HTAPORN.NZY

October 09, 2012
 Analysis by: Nice Yutuc
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan may be hosted on a website and run when a user accesses the said website.

It creates registry entries to enable its automatic execution at every system startup.

  TECHNICAL DETAILS

File Size:

1,063 bytes

File Type:

HTML, HTM

Initial Samples Received Date:

09 Sep 2011

Arrival Details

This Trojan may be hosted on a website and run when a user accesses the said website.

Installation

This Trojan drops the following file(s)/component(s):

  • %User Profile%\My Documents\council_120f1f7b6536b8734d9a7bfd22a15857b63c0859.vbs

(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.)

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\Run
council_120f1f7b6536b8734d9a7bfd22a15857b63c0859 = "%User Profile%\My Documents\council_120f1f7b6536b8734d9a7bfd22a15857b63c0859.vbs"

Other System Modifications

This Trojan modifies the following registry key(s)/entry(ies) as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
MessengerService
Server = "messenger.hotmail.com;64.4.61.35:1863"

(Note: The default value data of the said registry entry is "messenger.hotmail.com;64.4.9.254:1863".)

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.416.06

FIRST VSAPI PATTERN DATE:

09 Sep 2011

VSAPI OPR PATTERN File:

8.417.00

VSAPI OPR PATTERN Date:

10 Sep 2011

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

Close all opened browser windows

Step 3

Restore this modified registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator’s help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\MessengerService
    • From: Server = "messenger.hotmail.com;64.4.61.35:1863"
      To: Server = "messenger.hotmail.com;64.4.9.254:1863"

Step 4

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
    • council_120f1f7b6536b8734d9a7bfd22a15857b63c0859 = "%User Profile%\My Documents\council_120f1f7b6536b8734d9a7bfd22a15857b63c0859.vbs"

Step 5

Search and delete these files

[ 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\council_120f1f7b6536b8734d9a7bfd22a15857b63c0859.vbs

Step 6

Scan your computer with your Trend Micro product to delete files detected as HTML_HTAPORN.NZY. 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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