TROJ_FAKEAV.NXK
Trojan horse FakeAV_s.AOL (AVG), Rogue:Win32/Winwebsec (Microsoft)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
769,688 bytes
EXE
Yes
04 Oct 2013
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Trojan drops the following copies of itself into the affected system:
- %All Users Profile%\Application Data\{random folder name}\{random filename}.exe
(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.)
It creates the following folders:
- %All Users Profile%\Application Data\{random folder name}
- %Start Menu%\Programs\Antivirus Security Pro
(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.)
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
AS2014 = "%All Users Profile%\Application Data\{random folder name}\{random filename}.exe"
Dropping Routine
This Trojan drops the following files:
- %All Users Profile%\Application Data\{random folder name}\{random filename}.in
- %All Users Profile%\Application Data\{random folder name}\{random filename}.lg
- %All Users Profile%\Application Data\{random folder name}\{random filename}.exe.manifest
- %All Users Profile%\Application Data\{random folder name}\{random filename}.ico
- %All Users Profile%\Application Data\{random folder name}\DD1
- %All Users Profile%\Application Data\{random folder name}\DD2
- %All Users Profile%\Application Data\{random folder name}\DD3
- %All Users Profile%\Application Data\{random folder name}\DD4
- %All Users Profile%\Application Data\{random folder name}\serv.bat
- %Desktop%\Antivirus Security Pro support.url
- %Desktop%\Antivirus Security Pro.lnk
- %Start Menu%\Programs\Antivirus Security Pro\Antivirus Security Pro support.url
- %Start Menu%\Programs\Antivirus Security Pro\Antivirus Security Pro.lnk
(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}.{BLOCKED}.1.127/api/dom/no_respond/?{random characters}
- http://{BLOCKED}.{BLOCKED}.1.127/api/stats/debug/1/?{random characters}
- http://{BLOCKED}.{BLOCKED}.1.127/api/stats/debug/2/?{random characters}
- http://{BLOCKED}.{BLOCKED}.1.127/api/stats/debug/3/?{random characters}
- http://{BLOCKED}.{BLOCKED}.1.127/api/urls/?{random characters}
- http://{BLOCKED}.{BLOCKED}.1.127/api/stats/debug/4/?{random characters}
SOLUTION
9.300
10.318.02
04 Oct 2013
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Identify and delete files detected as TROJ_FAKEAV.NXK using the Recovery Console
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- AS2014 = "%All Users Profile%\Application Data\{random folder name}\{random filename}.exe"
- AS2014 = "%All Users Profile%\Application Data\{random folder name}\{random filename}.exe"
Step 4
Search and delete these folders
- %All Users Profile%\Application Data\{random folder name}
- %Start Menu%\Programs\Antivirus Security Pro
Step 5
Search and delete this file
- %Desktop%\Antivirus Security Pro support.url
- %Desktop%\Antivirus Security Pro.lnk
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.NXK. 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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