TROJ_SIREFEF.SME
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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.
It executes then deletes itself afterward.
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 files:
- %Application Data%\{GUID}\@
- %Windows%\Installer\{GUID}\@
- %Windows%\Installer\{GUID}\U\00000001.@
- %Windows%\Installer\{GUID}\U\800000cb.@
- %Windows%\Installer\{GUID}\U\80000000.@
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %Windows% is the Windows folder, which is usually C:\Windows.)
It drops and executes the following files:
- %Application Data%\{GUID}\n
- %Windows%\Installer\{GUID}\n
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %Windows% is the Windows folder, which is usually C:\Windows.)
It creates the following folders:
- %Windows%\Installer\{GUID}\L
- %Windows%\Installer\{GUID}\U
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It executes then deletes itself afterward.
Other System Modifications
This Trojan adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\Classes\
CLSID\{GUID}\InprocServer32
@ = "%Application Data%\{GUID}\n"
HKEY_CURRENT_USER\CLSID\{GUID}\
InprocServer32
ThreadingModel = "Both"
It modifies the following registry entries:
HKEY_CLASSES_ROOT\CLSID\{GUID}\
InprocServer32
(Default) = "\.\globalroot\systemroot\Installer\{GUI}\n"
(Note: The default value data of the said registry entry is "%System%\wbem\wbemess.dll".)