Methodology_Suspicious_Shortcut_Local_URL

rule Methodology_Suspicious_Shortcut_Local_URL
{
  meta:
    author = "@itsreallynick (Nick Carr), @QW5kcmV3 (Andrew Thompson)"
    description = "Detects local script usage for .URL persistence"
    reference = "https://twitter.com/cglyer/status/1176184798248919044"
    score = 50
    date = "27.09.2019"
    id = "438d9323-cb6a-5f5d-af71-76692b93436a"
  strings:
    $file = "URL=file:///" nocase
    $url_clsid = "[{000214A0-0000-0000-C000-000000000046}]"
    $url_explicit = "[InternetShortcut]" nocase
  condition:
    $file and any of ($url*)
    and uint16(0) != 0x5A4D and uint32(0) != 0x464c457f and uint32(0) != 0xBEBAFECA and uint32(0) != 0xFEEDFACE and uint32(0) != 0xFEEDFACF and uint32(0) != 0xCEFAEDFE
    and filesize < 30KB
}