TROJ_FAKEAV.KOH
Rogue:Win32/Winwebsec(Microsoft), W32/FakeAV.KLA!tr(Fortinet), Win32/Adware.SystemSecurity.AL application(Eset), Trojan.Win32.Yakes(Ikarus)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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
438,272 bytes
EXE
Yes
22 Feb 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 files:
- {All User's Profile}\Application Data\{random folder name}\{random file name}.ico
- {All User's Profile}\Application Data\{random folder name}\{random file name}
It drops the following copies of itself into the affected system:
- {All User's Profile}\Application Data\{random folder name}\{random file name}.exe
It creates the following folders:
- {All User's Profile}\Application Data\{random folder name}
- {All User's Profile}\Application Data\Help
- %Application Data%\Help
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming 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\RunOnce
{random file name} = "{All User's Profile}\Application Data\{random folder name}\{random file name}.exe"
Other Details
This Trojan connects to the following possibly malicious URL:
- http://sys.{BLOCKED}support.net/?
- http://{BLOCKED}.{BLOCKED}.104.243/?ts=f21422d174931dadbf5fe865b671c85add4ddfeb
- http://{BLOCKED}.{BLOCKED}.174.49/payform2/?
- http://{BLOCKED}.{BLOCKED}.104.243/?ts=f21422d174931dadbf5fe865b671c85add4ddfeb&affid=03600&ver=3070025&group=dap
SOLUTION
9.300
9.746.04
22 Feb 2013
9.747.00
23 Feb 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
Restart in Safe Mode
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\RunOnce
- {random file name} = "{All User's Profile}\Application Data\{random folder name}\{random file name}.exe"
- {random file name} = "{All User's Profile}\Application Data\{random folder name}\{random file name}.exe"
Step 4
Search and delete these folders
- {All User's Profile}\Application Data\{random folder name}
- {All User's Profile}\Application Data\Help
- %Application Data%\Help
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAKEAV.KOH. 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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