BKDR_GOOMHTTP.EV
Backdoor:Win32/FlyAgent.H (Microsoft); BackDoor-DRV.gen.c (McAfee); ARC:Embedded, [script.fly]:Trojan-Spy.Win32.FlyStudio.dyf, PAK:[krnln.fnr]:UPX (Kaspersky); Backdoor.Win32.FlyAgent.h (v) (Sunbelt); Trojan:W32/Agent.DNQW (FSecure)
Windows 2000, Windows XP, Windows Server 2003

Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor 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
Arrival Details
This backdoor 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 backdoor creates the following folders:
- %User Temp%\E_4
- %User Temp%\BClib
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Autostart Technique
This backdoor registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\HHServerName\Parameters
Other System Modifications
This backdoor adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\rising\
KaKa
HKEY_CURRENT_USER\Software\FlySky\
E\Install
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\rising\
KaKa
procrun = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Check_Associations = "NO"
HKEY_CURRENT_USER\Software\FlySky\
E\Install
Path = "%User Temp%\BClib"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\HHServerName\Parameters
Application = "%System%\HHClientName.exe"
Dropping Routine
This backdoor drops the following files:
- %User Temp%\E_4\krnln.fnr
- %User Temp%\E_4\Exmlrpc.fne
- %User Temp%\E_4\dp1.fne
- %System%\HHClientName.exe
- {malware path and file name}_and deleteme.bat
- %System%\HHClientName.dll
- %User Temp%\_eviip.tmp
- %Windows%\Fonts\dfab2c6259b278c98cbe466e8e73acd2.dat
- %User Temp%\BClib\krnln.fnr
- %User Temp%\BClib\dp1.fne
- %User Temp%\BClib\Exmlrpc.fne
- %User Temp%\BClib\krnln.fne
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.. %Windows% is the Windows folder, which is usually C:\Windows.)
This report is generated via an automated analysis system.
SOLUTION
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 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\SYSTEM\CurrentControlSet\Services\HHServerName
- Parameters
- In HKEY_LOCAL_MACHINE\SOFTWARE\rising
- KaKa
- In HKEY_CURRENT_USER\Software\FlySky\E
- Install
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_LOCAL_MACHINE\SOFTWARE\rising\KaKa
- procrun = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- Check_Associations = "NO"
- In HKEY_CURRENT_USER\Software\FlySky\E\Install
- Path = "%User Temp%\BClib"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\HHServerName\Parameters
- Application = "%System%\HHClientName.exe"
Step 5
Search and delete these components
- %User Temp%\E_4\krnln.fnr
- %User Temp%\E_4\Exmlrpc.fne
- %User Temp%\E_4\dp1.fne
- %System%\HHClientName.exe
- {malware path and file name}_and deleteme.bat
- %System%\HHClientName.dll
- %User Temp%\_eviip.tmp
- %Windows%\Fonts\dfab2c6259b278c98cbe466e8e73acd2.dat
- %User Temp%\BClib\krnln.fnr
- %User Temp%\BClib\dp1.fne
- %User Temp%\BClib\Exmlrpc.fne
- %User Temp%\BClib\krnln.fne
Step 6
Search and delete these folders
- %User Temp%\E_4
- %User Temp%\BClib
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_GOOMHTTP.EV. 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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