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Trojan:Win32/Sefnit.O


Trojan:Win32/Sefnit.O is a malicious program that is unable to spread of its own accord. It may perform a number of actions of an attacker's choice on an affected computer.


What to do now

To detect and remove this threat and other malicious software that may have been installed in your computer, run a full-system scan with an up-to-date antivirus product such as the following: For more information about using antivirus software, see http://www.microsoft.com/windows/antivirus-partners/.

Threat behavior

Trojan:Win32/Sefnit.O is a malicious program that is unable to spread of its own accord. It may perform a number of actions of an attacker's choice on an affected computer.
Installation
Trojan:Win32/Sefnit.O creates the following files on an affected computer:

  • %programfiles%\qgwntawzs\28pch.cpl - detected as Trojan:Win32/Sefnit.O
  • c:\documents and settings\administrator\local settings\temp\k33cng2jpvu.dll - detected as Trojan:Win32/Sefnit.O
  • c:\documents and settings\administrator\local settings\temp\okdo-doc-docx-to-image-converter-4.0.exe
  • c:\documents and settings\administrator\local settings\temp\okdo-doc-docx-to-image-converter-4.0.log
  • c:\documents and settings\administrator\local settings\temp\is-escg5.tmp\okdo-doc-docx-to-image-converter-4.0.tmp
  • c:\documents and settings\administrator\local settings\temp\is-lj4ql.tmp\_isetup\_regdll.tmp
  • c:\documents and settings\administrator\local settings\temp\is-lj4ql.tmp\_isetup\_shfoldr.dll
  • c:\documents and settings\administrator\local settings\temp\nsdf.tmp\inetc.dll

The malware modifies the following registry entries to ensure %programfiles%\qgwntawzs\28pch.cpl executes at each Windows start:

Adds value: "28Pch"
With data: "control.exe "c:\program files\qgwntawzs\28pch.cpl",0,1"
To subkey: HKCU\Software\Microsoft\windows\currentversion\run
Payload
Contacts remote host
Trojan:Win32/Sefnit.O may contact a remote host at freshversion.biz using port 80. Commonly, malware may contact a remote host for the following purposes:
  • To report a new infection to its author
  • To receive configuration or other data
  • To download and execute arbitrary files (including updates or additional malware)
  • To receive instruction from a remote attacker
  • To upload data taken from the affected computer

This malware description was produced and published using our automated analysis system's examination of file SHA1 d74ce0052089c067ab63e9884014585c20b59e7a.

Symptoms

System changes
The following system changes may indicate the presence of this malware:

  • The presence of the following files:
  • %programfiles%\qgwntawzs\28pch.cpl
    c:\documents and settings\administrator\local settings\temp\k33cng2jpvu.dll
    c:\documents and settings\administrator\local settings\temp\okdo-doc-docx-to-image-converter-4.0.exe
    c:\documents and settings\administrator\local settings\temp\okdo-doc-docx-to-image-converter-4.0.log
    c:\documents and settings\administrator\local settings\temp\is-escg5.tmp\okdo-doc-docx-to-image-converter-4.0.tmp
    c:\documents and settings\administrator\local settings\temp\is-lj4ql.tmp\_isetup\_regdll.tmp
    c:\documents and settings\administrator\local settings\temp\is-lj4ql.tmp\_isetup\_shfoldr.dll
    c:\documents and settings\administrator\local settings\temp\nsdf.tmp\inetc.dll

  • The presence of the following registry modifications:
  • Adds value: "28Pch"
    With data: "control.exe "c:\program files\qgwntawzs\28pch.cpl",0,1"
    To subkey: HKCU\Software\Microsoft\windows\currentversion\run


Prevention


Alert level: Severe
First detected by definition: 1.103.1297.0
Latest detected by definition: 1.173.2181.0 and higher
First detected on: May 09, 2011
This entry was first published on: May 11, 2011
This entry was updated on: May 11, 2011

This threat is also detected as:
  • not-a-virus:AdWare.Win32.Gamevance.hezx (Kaspersky)