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Fake Conficker Removal Tool - Agent.MSU

03/26/2020 4 People found this article helpful 195,160 Views

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    Description

    Fake Conficker Removal Tool - Agent.MSU

    Resolution


    Fake Conficker Removal Tool - Agent.MSU (June 10, 2009)

    SonicWall UTM Research team observed a new Trojan Downloader spammed in the wild starting June 9, 2009 pretending to be from Microsoft Security Department.
    The email pretends to contain important Windows XP/Vista security update related to the Conficker worm and also contains a link to download a removal tool. The download link points to the new Trojan Downloader. The link leads to download of the malicious executable file from a domain in Russia:
    • windowsupdate.microsoft.com.(Removed).ru/remtool_conf.exe
    The downloaded file has zero AV detection at the time of writing this alert and it looks like this:
    When executed the Trojan performs following activities:
    • Stops the Windows security center service (Service Name: wscsvc)
    • Creates a new directory (Windows Temporary folder)
      sf3.tmp and drops webexplorer.exe, nsExec.dll, and NSISdl.dll files in it.
    • Opens up a new window displaying Symantec Trojan.Brisv.A Removal Tool 2.1.0.7 EULA:
    • If the user clicks accept button and starts the tool it will run for a while and display a "fixbrisa" message box at the end:
    • It attempts to connect to makemymoneys.com domain and downloads an Injector Trojan by sending HTTP GET request:
      • GET /install/winupdate.exe - Detected as GAV: Injector.PI (Trojan)
    SonicWall Gateway AntiVirus provides protection against this malware via GAV: Agent.MSU (Trojan) signature.
    Screenshot of the original e-mail message is shown below:

    Click here to read the complete security alert from SonicWall Security Centre.

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