TROJ_SIREFEF.BCC
TrojanDropper:Win32/Sirefef.BB (Microsoft), Win32/Sirefef.FY trojan (ESET)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan deletes itself after execution.
TECHNICAL DETAILS
Installation
This Trojan drops the following copies of itself into the affected system and executes them:
- %AppDataLocal%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}\{GUID}\GoogleUpdate.exe
- %Program Files%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}\{GUID}\GoogleUpdate.exe
(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local 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).)
It drops the following files:
- %Windows%\assembly\GAC\Desktop.ini
- %AppDataLocal%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}\{GUID}\@
- %Program Files%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}\{GUID}\@
(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local 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).)
It creates the following folders:
- %AppDataLocal%\Google\Desktop\Install\{GUID}
- %AppDataLocal%\Google\Desktop\Install\{GUID}\{unprintable characters1}
- %AppDataLocal%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}
- %AppDataLocal%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}
- %AppDataLocal%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}\{GUID}
- %AppDataLocal%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}\{GUID}\U
- %AppDataLocal%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}\{GUID}\L
- %Program Files%\Google\Desktop\Install\{GUID}
- %Program Files%\Google\Desktop\Install\{GUID}\{unprintable characters1}
- %Program Files%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}
- %Program Files%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}
- %Program Files%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}\{GUID}
- %Program Files%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}\{GUID}\U
- %Program Files%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}\{GUID}\L
(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local 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).)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Google Update = ""%AppDataLocal%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}\{GUID}\GoogleUpdate.exe" >"
It registers its dropped component as a system service to ensure its automatic execution at every system startup. It does this by creating the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{unprintable character}etadpug
Parameters = "136"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{unprintable character}etadpug
Start = "2"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{unprintable character}etadpug
Type = "16"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{unprintable character}etadpug
ErrorControl = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{unprintable character}etadpug
ImagePath = "%Program Files%\Google\Desktop\Install\{GUID}\{unprintable characters1}\{unprintable characters2}\{unprintable characters3}\{GUID}\GoogleUpdate.exe"
It registers its dropped component as a system service to ensure its automatic execution at every system startup. It does this by creating the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\{unprintable character}etadpug
Other System Modifications
This Trojan deletes the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_BITS
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_SHAREDACCESS
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_WSCSVC
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_WUAUSERV
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wscsvc
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wuauserv
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\BITS
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wuauserv
Other Details
This Trojan connects to the following possibly malicious URL:
- http://j.{BLOCKED}d.com/app/geoip.js
It deletes itself after execution.