TROJ_MICROFAK.AY
DDoS:Win32/Nitol.B (Microsoft); Trojan-FCKS!ACC9374F5734 (McAfee); Trojan.Win32.Jorik.ServStart.ok (Kaspersky); Trojan.Win32.Scar.aa (v) (Sunbelt); Trojan horse DDoS.AC (AVG)
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.
Installation
This Trojan drops the following copies of itself into the affected system:
- %System%\rebfec.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Other System Modifications
This Trojan adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\aspnet_statesusq
Description = "Provides support for out-of-to-processmtn Transaction Coordinator Service."
Dropping Routine
This Trojan drops the following files:
- gei33.dll
- %User Profile%\{AC76BA86-7AD7-1033-7B44-AA0000000001}\lpk.dll
- %Program Files%\Adobe\Reader 10.0\Reader\lpk.dll
- %Program Files%\Common Files\Adobe\ARM\1.0\lpk.dll
- %Program Files%\Common Files\Microsoft Shared\DW\lpk.dll
- %Program Files%\Common Files\Microsoft Shared\MSInfo\lpk.dll
- %Program Files%\Common Files\Microsoft Shared\Speech\lpk.dll
- %Program Files%\Internet Explorer\Connection Wizard\lpk.dll
- %Program Files%\Internet Explorer\lpk.dll
- %Program Files%\Messenger\lpk.dll
- %Program Files%\Movie Maker\lpk.dll
- %Program Files%\MSN\MSNCoreFiles\Install\MSN9Components\lpk.dll
- %Program Files%\MSN\MSNCoreFiles\Install\lpk.dll
- %Program Files%\MSN Gaming Zone\Windows\lpk.dll
- %Program Files%\NetMeeting\lpk.dll
- %Program Files%\Outlook Express\lpk.dll
- %Program Files%\Windows Media Player\lpk.dll
- %Program Files%\Windows NT\Accessories\lpk.dll
- %Program Files%\Windows NT\lpk.dll
- %Program Files%\Windows NT\Pinball\lpk.dll
- %Program Files%\WinPcap\lpk.dll
- %System Root%\System Volume Information\_restore{7209F5A7-047B-4D4C-9F8A-3A6AE938F17C}\RP10\lpk.dll
- %System Root%\System Volume Information\_restore{7209F5A7-047B-4D4C-9F8A-3A6AE938F17C}\RP3\lpk.dll
- %System Root%\System Volume Information\_restore{7209F5A7-047B-4D4C-9F8A-3A6AE938F17C}\RP4\lpk.dll
- %System Root%\System Volume Information\_restore{7209F5A7-047B-4D4C-9F8A-3A6AE938F17C}\RP6\lpk.dll
- %System Root%\System Volume Information\_restore{7209F5A7-047B-4D4C-9F8A-3A6AE938F17C}\RP7\lpk.dll
- %Windows%\$MSI31Uninstall_KB893803v2$\lpk.dll
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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
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\SYSTEM\ControlSet001\Services\aspnet_statesusq
- Description = "Provides support for out-of-to-processmtn Transaction Coordinator Service."
Step 3
Search and delete these components
- gei33.dll
- %User Profile%\{AC76BA86-7AD7-1033-7B44-AA0000000001}\lpk.dll
- %Program Files%\Adobe\Reader 10.0\Reader\lpk.dll
- %Program Files%\Common Files\Adobe\ARM\1.0\lpk.dll
- %Program Files%\Common Files\Microsoft Shared\DW\lpk.dll
- %Program Files%\Common Files\Microsoft Shared\MSInfo\lpk.dll
- %Program Files%\Common Files\Microsoft Shared\Speech\lpk.dll
- %Program Files%\Internet Explorer\Connection Wizard\lpk.dll
- %Program Files%\Internet Explorer\lpk.dll
- %Program Files%\Messenger\lpk.dll
- %Program Files%\Movie Maker\lpk.dll
- %Program Files%\MSN\MSNCoreFiles\Install\MSN9Components\lpk.dll
- %Program Files%\MSN\MSNCoreFiles\Install\lpk.dll
- %Program Files%\MSN Gaming Zone\Windows\lpk.dll
- %Program Files%\NetMeeting\lpk.dll
- %Program Files%\Outlook Express\lpk.dll
- %Program Files%\Windows Media Player\lpk.dll
- %Program Files%\Windows NT\Accessories\lpk.dll
- %Program Files%\Windows NT\lpk.dll
- %Program Files%\Windows NT\Pinball\lpk.dll
- %Program Files%\WinPcap\lpk.dll
- %System Root%\System Volume Information\_restore{7209F5A7-047B-4D4C-9F8A-3A6AE938F17C}\RP10\lpk.dll
- %System Root%\System Volume Information\_restore{7209F5A7-047B-4D4C-9F8A-3A6AE938F17C}\RP3\lpk.dll
- %System Root%\System Volume Information\_restore{7209F5A7-047B-4D4C-9F8A-3A6AE938F17C}\RP4\lpk.dll
- %System Root%\System Volume Information\_restore{7209F5A7-047B-4D4C-9F8A-3A6AE938F17C}\RP6\lpk.dll
- %System Root%\System Volume Information\_restore{7209F5A7-047B-4D4C-9F8A-3A6AE938F17C}\RP7\lpk.dll
- %Windows%\$MSI31Uninstall_KB893803v2$\lpk.dll
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_MICROFAK.AY. 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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