TROJ_AGENT.IXH
VirTool:Win32/Injector.BZ (Microsoft); Trojan.ADH.2 (Symantec); Trojan.Win32.Generic!BT (Sunbelt); Gen:Variant.Minggy.4 (FSecure)
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
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.
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
skype = "%User Profile%\Application Data\3,5.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
skype = "%User Profile%\Application Data\3,5.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{4F1D58CE-FFEE-15CA-C268-DEDCEB3EF5DB}
StubPath = "%User Profile%\Application Data\3,5.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Active Setup\Installed Components\{4F1D58CE-FFEE-15CA-C268-DEDCEB3EF5DB}
StubPath = "%User Profile%\Application Data\3,5.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\run
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{4F1D58CE-FFEE-15CA-C268-DEDCEB3EF5DB}
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Active Setup\Installed Components\{4F1D58CE-FFEE-15CA-C268-DEDCEB3EF5DB}
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
SrvID\ID
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
INSTALL\DATE
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\run
skype = "%User Profile%\Application Data\3,5.exe"
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
SrvID\ID
FTF92HAELW = "uppdate"
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
INSTALL\DATE
FTF92HAELW = "October 1, 2011"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Profile%\Application Data\3,5.exe = "{random characters}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path and file name}.exe = "{malware path and file name}.exe:*:enabled:windows messanger"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DoNotAllowExceptions = "0"
This report is generated via an automated analysis system.
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
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\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
- run
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
- {4F1D58CE-FFEE-15CA-C268-DEDCEB3EF5DB}
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Active Setup\Installed Components
- {4F1D58CE-FFEE-15CA-C268-DEDCEB3EF5DB}
- In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\SrvID
- ID
- In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\INSTALL
- DATE
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\Microsoft\Windows\CurrentVersion\Run
- skype = "%User Profile%\Application Data\3,5.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- skype = "%User Profile%\Application Data\3,5.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{4F1D58CE-FFEE-15CA-C268-DEDCEB3EF5DB}
- StubPath = "%User Profile%\Application Data\3,5.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Active Setup\Installed Components\{4F1D58CE-FFEE-15CA-C268-DEDCEB3EF5DB}
- StubPath = "%User Profile%\Application Data\3,5.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run
- skype = "%User Profile%\Application Data\3,5.exe"
- In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\SrvID\ID
- FTF92HAELW = "uppdate"
- In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\INSTALL\DATE
- FTF92HAELW = "October 1, 2011"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %User Profile%\Application Data\3,5.exe = "{random characters}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- {malware path and file name}.exe = "{malware path and file name}.exe:*:enabled:windows messanger"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DoNotAllowExceptions = "0"
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_AGENT.IXH. 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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