TROJ_FAKEAV.STL
Windows 98, ME, NT, 2000, XP, Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Trojan uses social engineering methods to lure users into performing certain actions that may, directly or indirectly, cause malicious routines to be performed. Specifically, it takes advantage of Google search function, wherein it returns a link that contains the malicious URL and file when a user keys in Tsunami hitting Hawaii.
To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.
This Trojan displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system. It then asks for users to purchase it once scanning is completed. If users decide to purchase the rogue product, users are directed to a certain website asking for sensitive information, such as credit card numbers.
TECHNICAL DETAILS
1,036,288 bytes
PE
Yes
01 Mar 2010
Displays windows, Downloads files
Arrival Details
This Trojan may be unknowingly downloaded by a user while visiting the following malicious websites:
- http://{BLOCKED}.{BLOCKED}.52.198/4_47f0b4.php
Installation
This Trojan drops the following files:
- %Desktop%\Security Tool.lnk - link to the copy of itself
- %User Profile%\Start Menu\Programs\Security Tool.lnk - link to the copy of itself
(Note: %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003.. %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.)
It creates the following folders:
- %Application Data%\{Malware name}
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data 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_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{Malware name} = %Application Data%\{Malware name}\{Malware name}.exe
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\{Malware name}
(Default) =
Download Routine
This Trojan downloads updated copies of itself from the following websites:
- http://{BLOCKED}.{BLOCKED}.75.26/buy2.php
- http://{BLOCKED}ybill.com/buy2.php
Rogue Antivirus Routine
This Trojan displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system. It then asks for users to purchase it once scanning is completed. If users decide to purchase the rogue product, users are directed to a certain website asking for sensitive information, such as credit card numbers.
SOLUTION
8.900
6.884.08
01 Mar 2010
6.885.00
02 Mar 2010
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
Delete this registry key
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
- {Malware name}
- {Malware name}
Step 3
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- {Malware name} = %Application Data%\{Malware name}\{Malware name}.exe
- {Malware name} = %Application Data%\{Malware name}\{Malware name}.exe
Step 4
Search and delete these files
- %Desktop%\Security Tool.lnk
- %User Profile%\Start Menu\Programs\Security Tool.lnk
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.STL. 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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