Virus

Adware/OneStep

Analysis

Adware/OneStep is classified as Adware.  Adware are software components that display unsolicited advertisements. For additional information about Adware and how Fortinet classifies Spyware threats, please see Fortinet's paper in PDF format: Spyware Classification and Terms.

Adware/OneStep displays pop-up advertisements on the infected computer. It installs itself as a Mozilla Firefox search plug-in. Once installed, it embeds search results from OneStepSearch.net with hidden advertisements.

  • It creates the following files and folders:
    • undefinedWINDIRundefined\Temp\ONE{random_number}.tmp\upgrade.exe
    • undefinedWINDIRundefined\Temp\{random_name}.tmp\Au_.exe
    • undefinedPROGRAMFILESundefined\OneStep\home.js
    • undefinedPROGRAMFILESundefined\OneStep\onestep.dll
    • undefinedPROGRAMFILESundefined\OneStep\onestep.exe
    • undefinedPROGRAMFILESundefined\OneStep\OneStep_deleted_\onestep.dll
    • undefinedPROGRAMFILESundefined\OneStep\OneStep_deleted_\onestep.exe
    • undefinedPROGRAMFILESundefined\OneStep\osopt.exe
    • undefinedPROGRAMFILESundefined\OneStep\readme.html
    • undefinedPROGRAMFILESundefined\OneStep\uninstall.exe
    • C:\Documents and Settings\All Users\Documents\HBEPGUID.TXT
    • C:\Documents and Settings\LocalService\Local Settings\Application Data\Mozilla\Firefox\Profiles\foo\XPC.mfl
    • C:\INSTALLED\Mozilla Firefox\extensions\{C7E0B063-1DC2-4DD0-A502-1D67957B9ADE}\chrome\onestep.jar
    • C:\INSTALLED\Mozilla Firefox\extensions\{C7E0B063-1DC2-4DD0-A502-1D67957B9ADE}\chrome.manifest
    • C:\INSTALLED\Mozilla Firefox\extensions\{C7E0B063-1DC2-4DD0-A502-1D67957B9ADE}\defaults\preferences\prefs.js
    • C:\INSTALLED\Mozilla Firefox\extensions\{C7E0B063-1DC2-4DD0-A502-1D67957B9ADE}\install.rdf
    • C:\INSTALLED\Mozilla Firefox\searchplugins\onestep.xml
  • It adds the following registry keys:
    • key: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\OneStep
    • key: HKLM\SOFTWARE\OneStep
    • key: HKLM\SYSTEM\CurrentControlSet\Services\OneStep Service
  • It tries to access the following URL:
    • www.OneStepSearch.net

    Recommended Action

      FortiGate Systems
    • Check the main screen using the web interface for your FortiGate unit to ensure that the latest AV/NIDS database has been downloaded and installed on your system - if required, enable the "Allow Push Update" option.
      FortiClient Systems
    • Quarantine/delete files that are detected and replace infected files with clean backup copies.