HTML_HTAPORN.NZY
Windows 2000, Windows XP, Windows Server 2003
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
1,063 bytes
HTML, HTM
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
9.200
8.416.06
09 Sep 2011
8.417.00
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
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"
- From: Server = "messenger.hotmail.com;64.4.61.35:1863"
Step 4
Delete this registry value
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"
- council_120f1f7b6536b8734d9a7bfd22a15857b63c0859 = "%User Profile%\My Documents\council_120f1f7b6536b8734d9a7bfd22a15857b63c0859.vbs"
Step 5
Search and delete these files
- %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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