Home Malware Programs Trojans Trojan SEFNIT

Trojan SEFNIT

Posted: November 22, 2011

Threat Metric

Threat Level: 8/10
Infected PCs: 58,353
First Seen: November 22, 2011
Last Seen: November 10, 2023
OS(es) Affected: Windows

Trojan SEFNIT is a dangerous Trojan that targets popular web browsers like Mozilla and Internet Explorer. Trojan SEFNIT blocks your activity to search engines and redirects search URL links. Trojan SEFNIT tries to exploit flaws in the affected web browser to obtain access to the infected computer. Trojan SEFNIT creates a .dll file and embeds it into processes of Mozilla and Internet Explorer, and generates mutex and startup registry entries.

Technical Details

File System Modifications

Tutorials: If you wish to learn how to remove malware components manually, you can read the tutorials on how to find malware, kill unwanted processes, remove malicious DLLs and delete other harmful files. Always be sure to back up your PC before making any changes.

The following files were created in the system:



C:\Windows\Temp\81D0.tmp File name: 81D0.tmp
Size: 335.87 KB (335872 bytes)
MD5: bf6054d16bbce96159f8cbbde8ea80b3
Detection count: 5,120
File type: Temporary File
Mime Type: unknown/tmp
Path: C:\Windows\Temp\81D0.tmp
Group: Malware file
Last Updated: May 13, 2023
%WINDIR%\SysWOW64\TrustedInstaller.exe File name: TrustedInstaller.exe
Size: 402.94 KB (402944 bytes)
MD5: a472021e21a13dc3081f99f53a5461a6
Detection count: 183
File type: Executable File
Mime Type: unknown/exe
Path: %WINDIR%\SysWOW64
Group: Malware file
Last Updated: July 28, 2016
%APPDATA%\Updater\updater.dll File name: updater.dll
Size: 1.56 MB (1564672 bytes)
MD5: b99fe4761f454b4e25e86152b4b51784
Detection count: 96
File type: Dynamic link library
Mime Type: unknown/dll
Path: %APPDATA%\Updater
Group: Malware file
Last Updated: March 23, 2016
%WINDIR%\system32\config\systemprofile\Local Settings\Application Data\Windows Internet Name Service\wins.exe File name: wins.exe
Size: 2.78 MB (2785792 bytes)
MD5: 7d60bc72c525b377068706c235f9cdc5
Detection count: 82
File type: Executable File
Mime Type: unknown/exe
Path: %WINDIR%\system32\config\systemprofile\Local Settings\Application Data\Windows Internet Name Service
Group: Malware file
Last Updated: August 20, 2016
%APPDATA%\Microsoft\ApplicationManager\stub.exe File name: stub.exe
Size: 214.52 KB (214528 bytes)
MD5: 24c2573af8b38dc88fb933ae12c9e40b
Detection count: 5
File type: Executable File
Mime Type: unknown/exe
Path: %APPDATA%\Microsoft\ApplicationManager
Group: Malware file
Last Updated: March 25, 2016

More files

Registry Modifications

The following newly produced Registry Values are:

Regexp file mask%APPDATA%\Microsoft\ApplicationManager\stub.exe%APPDATA%\Updater\updater.dll%WINDIR%\system32\config\systemprofile\AppData\Local\Windows Internet Name Service\wins.exe%WINDIR%\SysWOW64\config\systemprofile\AppData\Local\Windows Internet Name Service\wins.exe

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