Hayabusa high test sigma

Network Communication Initiated To File Sharing Domains From Process Located In Suspicious Folder

Detects executables located in potentially suspicious directories initiating network connections towards file sharing domains.

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Detection Logic

{
  "network_connection": {
    "EventID": 5156,
    "Channel": "Security"
  },
  "selection_paths": {
    "Application
| contains": [
      ":\\$Recycle.bin",
      ":\\Perflogs\\",
      ":\\Temp\\",
      ":\\Users\\Default\\",
      ":\\Users\\Public\\",
      ":\\Windows\\Fonts\\",
      ":\\Windows\\IME\\",
      ":\\Windows\\System32\\Tasks\\",
      ":\\Windows\\Tasks\\",
      ":\\Windows\\Temp\\",
      "\\AppData\\Temp\\",
      "\\config\\systemprofile\\",
      "\\Windows\\addins\\"
    ]
  },
  "selection_domains": {
    "DestinationHostname
| endswith": [
      ".githubusercontent.com",
      "0x0.st",
      "anonfiles.com",
      "bashupload.com",
      "cdn.discordapp.com",
      "chunk.io",
      "ddns.net",
      "dl.dropboxusercontent.com",
      "ghostbin.co",
      "github.com",
      "glitch.me",
      "gofile.io",
      "hastebin.com",
      "mediafire.com",
      "mega.co.nz",
      "mega.nz",
      "onrender.com",
      "pages.dev",
      "paste.ee",
      "pastebin.com",
      "pastebin.pl",
      "pastetext.net",
      "pixeldrain.com",
      "privatlab.com",
      "privatlab.net",
      "send.exploit.in",
      "sendspace.com",
      "storage.googleapis.com",
      "storjshare.io",
      "supabase.co",
      "temp.sh",
      "transfer.sh",
      "trycloudflare.com",
      "ufile.io",
      "w3spaces.com",
      "workers.dev",
      "x0.at"
    ],
    "Direction": "%%14593"
  },
  "condition": "network_connection and (all of selection_*)"
}

False Positives

  • Some installers located in the temp directory might communicate with the Github domains in order to download additional software. Baseline these cases or move the github domain to a lower level hunting rule.

Field Validations

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