WORM_INJECTEX.AJ
Trojan:Win32/Rimecud.A (Microsoft); W32.Pilleuz (Symantec); Worm.Win32.FFAuto.jkh (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.KDV.93461 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm 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
1,552,384 bytes
EXE
Yes
24 Aug 2012
Arrival Details
This worm 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 worm drops the following copies of itself into the affected system:
- %User Profile%\Application Data\vfbu.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Taskman = "%User Profile%\Application Data\vfbu.exe"
Other System Modifications
This worm deletes the following files:
- %User Profile%\Application Data\vfbu.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Licenses
HKEY_CLASSES_ROOT\CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}\InprocServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}\MiscStatus
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}\MiscStatus\
1
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}\ProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}\ToolboxBitmap32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}\Version
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}\VersionIndependentProgID
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Licenses
{K7C0DB872A3F777C0} = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}\InprocServer32
ThreadingModel = "Apartment"
HKEY_CURRENT_USER\Software\Licenses
{IAA4A1823DF778B97} = "{random values}"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RFC1156Agent\CurrentVersion\Parameters
TrapPollTimeMilliSecs = "3a98"
(Note: The default value data of the said registry entry is 3a98.)
Dropping Routine
This worm drops the following files:
- %User Temp%\B42CE9E6.TMP
(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.)
This report is generated via an automated analysis system.
SOLUTION
9.200
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
Identify and delete files detected as WORM_INJECTEX.AJ using either the Startup Disk or Recovery Console
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_CURRENT_USER\Software
- Licenses
- In HKEY_CLASSES_ROOT\CLSID
- {5A8A1D95-22E9-3963-2E06-90BDD094E562}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}
- InprocServer32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}
- MiscStatus
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}\MiscStatus
- 1
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}
- ProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}
- ToolboxBitmap32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}
- TypeLib
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}
- Version
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}
- VersionIndependentProgID
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 NT\CurrentVersion\Winlogon
- Taskman = "%User Profile%\Application Data\vfbu.exe"
- In HKEY_CURRENT_USER\Software\Licenses
- {K7C0DB872A3F777C0} = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{5A8A1D95-22E9-3963-2E06-90BDD094E562}\InprocServer32
- ThreadingModel = "Apartment"
- In HKEY_CURRENT_USER\Software\Licenses
- {IAA4A1823DF778B97} = "{random values}"
Step 5
Restore this modified 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\RFC1156Agent\CurrentVersion\Parameters
- From: TrapPollTimeMilliSecs = "3a98"
To: TrapPollTimeMilliSecs = ""3a98""
- From: TrapPollTimeMilliSecs = "3a98"
Step 6
Search and delete this file
- %User Temp%\B42CE9E6.TMP
Step 7
Scan your computer with your Trend Micro product to delete files detected as WORM_INJECTEX.AJ. 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.
Step 8
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %User Profile%\Application Data\vfbu.exe
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