Sigma low experimental sigma

BITS Client BitsProxy DLL Loaded By Uncommon Process

Detects an uncommon process loading the "BitsProxy.dll". This DLL is used when the BITS COM instance or API is used. This detection can be used to hunt for uncommon processes loading this DLL in your environment. Which may indicate potential suspicious activity occurring.

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Detection Logic

{
  "selection": {
    "ImageLoaded
| endswith": "\\BitsProxy.dll"
  },
  "filter_main_system": {
    "Image": [
      "C:\\Windows\\System32\\aitstatic.exe",
      "C:\\Windows\\System32\\bitsadmin.exe",
      "C:\\Windows\\System32\\desktopimgdownldr.exe",
      "C:\\Windows\\System32\\DeviceEnroller.exe",
      "C:\\Windows\\System32\\MDMAppInstaller.exe",
      "C:\\Windows\\System32\\ofdeploy.exe",
      "C:\\Windows\\System32\\RecoveryDrive.exe",
      "C:\\Windows\\System32\\Speech_OneCore\\common\\SpeechModelDownload.exe",
      "C:\\Windows\\SysWOW64\\bitsadmin.exe",
      "C:\\Windows\\SysWOW64\\OneDriveSetup.exe",
      "C:\\Windows\\SysWOW64\\Speech_OneCore\\Common\\SpeechModelDownload.exe"
    ]
  },
  "filter_optional_chrome": {
    "Image": "C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe"
  },
  "condition": "selection and not 1 of filter_main_* and not 1 of filter_optional_*"
}

False Positives

⚠ Allowed binaries in the environment that do BITS Jobs

Field Validations

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