TROJ_WEBTOOS.G
Trojan:Win32/WebToos.A (Microsoft); [000c03e8.EXE]:RDN/Generic.dx!d2b, [000107c8.EXE]:NTRootKit-K (McAfee); Rootkit.Win32.Agent.eguv (Kaspersky); Troj/RKPort-Fam, Troj/Gates-A (Sophos); Trojan horse Generic36.XBN.dropper (AVG)
Windows
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.
Installation
This Trojan creates the following folders:
- %Program Files%\DbSecuritySpt
(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
ESENT\Process\DbSecuritySpt
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
ESENT\Process\DbSecuritySpt\
DEBUG
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
ESENT
EventMessageFile = "%System%\ESENT.dll"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
ESENT
CategoryMessageFile = "%System%\ESENT.dll"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
ESENT
CategoryCount = "1"
(Note: The default value data of the said registry entry is 10.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
ESENT
TypesSupported = "7"
(Note: The default value data of the said registry entry is 7.)
Dropping Routine
This Trojan drops the following files:
- %Program Files%\DbSecuritySpt\DbSecuritySpt.exe
- %Program Files%\DbSecuritySpt\svch0st.exe
- %Program Files%\Windows Media Player\agony.exe
- %Program Files%\Windows Media Player\agony.sys
- %Program Files%\Windows Media Player\DNSProtection.exe
- %Program Files%\Windows Media Player\DNSSupport.exe
(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)
Other Details
This Trojan connects to the following possibly malicious URL:
- {BLOCKED}9.224.241
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
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\ESENT\Process
- DbSecuritySpt
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ESENT\Process\DbSecuritySpt
- DEBUG
Step 3
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\ESENT
- From: EventMessageFile = "%System%\ESENT.dll"
To: EventMessageFile = ""{random values}""
- From: EventMessageFile = "%System%\ESENT.dll"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\ESENT
- From: CategoryMessageFile = "%System%\ESENT.dll"
To: CategoryMessageFile = ""{random values}""
- From: CategoryMessageFile = "%System%\ESENT.dll"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\ESENT
- From: CategoryCount = "1"
To: CategoryCount = ""10""
- From: CategoryCount = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\ESENT
- From: TypesSupported = "7"
To: TypesSupported = ""7""
- From: TypesSupported = "7"
Step 4
Search and delete these components
- %Program Files%\DbSecuritySpt\DbSecuritySpt.exe
- %Program Files%\DbSecuritySpt\svch0st.exe
- %Program Files%\Windows Media Player\agony.exe
- %Program Files%\Windows Media Player\agony.sys
- %Program Files%\Windows Media Player\DNSProtection.exe
- %Program Files%\Windows Media Player\DNSSupport.exe
Step 5
Search and delete this folder
- %Program Files%\DbSecuritySpt
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_WEBTOOS.G. 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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