Methodology_Suspicious_Shortcut_SMB_URL

rule Methodology_Suspicious_Shortcut_SMB_URL
{
  meta:
    author = "@itsreallynick (Nick Carr), @QW5kcmV3 (Andrew Thompson)"
    description = "Detects remote SMB path for .URL persistence"
    reference = "https://twitter.com/cglyer/status/1176184798248919044"
    sample = "e0bef7497fcb284edb0c65b59d511830"
    score = 50
    date = "27.09.2019"
    id = "e23609a1-9b18-5a56-92ee-c7f84c966865"
  strings:
    $file = /URL=file:\/\/[a-z0-9]/ 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
}