TROJ_SIREFEF.TG
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
190,464 bytes
EXE
23 Jun 2012
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:
- %Application Data%\{082f346d-1afd-ef95-7a41-5848b36bed23}
- %Application Data%\{082f346d-1afd-ef95-7a41-5848b36bed23}\U
- %Application Data%\{082f346d-1afd-ef95-7a41-5848b36bed23}\L
- %Windows%\Installers\{082f346d-1afd-ef95-7a41-5848b36bed23}
- %Windows%\Installers\{082f346d-1afd-ef95-7a41-5848b36bed23}\U
- %Windows%\Installers\{082f346d-1afd-ef95-7a41-5848b36bed23}\L
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Autostart Technique
This Trojan creates the following registry entries to enable automatic execution of dropped component at every system startup:
HKEY_CURRENT_USER\Software\Classes\
CLSID\{42aedc87-2188-41fd-b9a3-0c966feabec1}
ThreadingModel = "Both"
HKEY_CURRENT_USER\Software\Classes\
CLSID\{42aedc87-2188-41fd-b9a3-0c966feabec1}
@ = "%Application Data%\{082f346d-1afd-ef95-7a41-5848b36bed23}\n."
Other System Modifications
This Trojan modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F3130CDB-AA52-4C3A-AB32-85FFC23AF9C1}\InprocServer32
@ = "\.\globalroot\systemroot\Installer\{082f346d-1afd-ef95-7a41-5848b36bed23}\n."
(Note: The default value data of the said registry entry is "%System%\wbem\wbemess.dll".)
HKEY_CLASSES_ROOT\CLSID\{42aedc87-2188-41fd-b9a3-0c966feabec1}\
InProcServer32
@ = "%Application Data%\{082f346d-1afd-ef95-7a41-5848b36bed23}\n."
(Note: The default value data of the said registry entry is %System%\wbem\wbemess.dll.)
HKEY_CLASSES_ROOT\CLSID\{42aedc87-2188-41fd-b9a3-0c966feabec1}\
InProcServer32
ThreadingModel = "Both"
(Note: The default value data of the said registry entry is "Apartment".)
Dropping Routine
This Trojan drops the following files:
- %Application Data%\{082f346d-1afd-ef95-7a41-5848b36bed23}\@
- %Application Data%\{082f346d-1afd-ef95-7a41-5848b36bed23}\n
- %Windows%\Installer\{082f346d-1afd-ef95-7a41-5848b36bed23}\@
- %Windows%\Installer\{082f346d-1afd-ef95-7a41-5848b36bed23}\n
- %Windows%\Installer\{082f346d-1afd-ef95-7a41-5848b36bed23}\U\00000001.@
- %Windows%\Installer\{082f346d-1afd-ef95-7a41-5848b36bed23}\U\80000000.@
- %Windows%\Installer\{082f346d-1afd-ef95-7a41-5848b36bed23}\U\800000cb.@
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
SOLUTION
9.200
9.212.04
23 Jun 2012
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_CURRENT_USER\Software\Classes\clsid
- {42aedc87-2188-41fd-b9a3-0c966feabec1}
- {42aedc87-2188-41fd-b9a3-0c966feabec1}
Step 4
Restore this modified registry value
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_CLASSES_ROOT\CLSID\{42aedc87-2188-41fd-b9a3-0c966feabec1}\InProcServer32
- From: @ = "%Application Data%\{082f346d-1afd-ef95-7a41-5848b36bed23}\n."
To: @ = %System%\wbem\wbemess.dll
- From: @ = "%Application Data%\{082f346d-1afd-ef95-7a41-5848b36bed23}\n."
- In HKEY_CLASSES_ROOT\CLSID\{42aedc87-2188-41fd-b9a3-0c966feabec1}\InProcServer32
- From: ThreadingModel = "Apartment"
To: ThreadingModel = "Both"
- From: ThreadingModel = "Apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F3130CDB-AA52-4C3A-AB32-85FFC23AF9C1}\InprocServer32
- From: @ = "\\.\globalroot\systemroot\Installer\{082f346d-1afd-ef95-7a41-5848b36bed23}\n."
To: @ = "%System%\wbem\wbemess.dll"
- From: @ = "\\.\globalroot\systemroot\Installer\{082f346d-1afd-ef95-7a41-5848b36bed23}\n."
Step 5
Search and delete these folders
- %Application Data%\{082f346d-1afd-ef95-7a41-5848b36bed23}
- %Windows%\Installers\{082f346d-1afd-ef95-7a41-5848b36bed23}
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_SIREFEF.TG. 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 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_SIREFEF.TG. 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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