TROJ_FAKEAV.ZAL
Windows 2000, XP, Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Trojan connects to a website to send and receive information.
It connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.
It 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
Arrival Details
This Trojan may be downloaded from the following remote sites:
- http://{BLOCKED}u.in/mediafix70700en02.exe
Installation
This Trojan drops the following non-malicious files:
- %Current Folder%\enemies-names.txt
- %Current Folder%\local.ini
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
mediafix70700en02.exe = {Malware Path and File Name
Other System Modifications
This Trojan adds the following registry keys as part of its installation routine:
HKEY_CURRENT_USER\Software\Antimalware Doctor Inc
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Antimalware Doctor
Backdoor Routine
This Trojan connects to the following websites to send and receive information:
- http://{BLOCKED}y.in/inst.php?
Download Routine
This Trojan connects to the following malicious URLs:
- httP://{BLOCKED}s.in/install.php
- http://{BLOCKED}s.in/
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
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.ZAL
Step 3
Terminate a process file/s detected as TROJ_FAKEAV.ZAL
*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.
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
- mediafix70700en02.exe = {Malware Path and File Name
- mediafix70700en02.exe = {Malware Path and File Name
Step 5
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_CURRENT_USER\Software
- Antimalware Doctor Inc
- Antimalware Doctor Inc
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall
- Antimalware Doctor
- Antimalware Doctor
Step 6
Search and delete this file
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.ZAL. 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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