SUSP_PE_Discord_Attachment_Oct21_1

rule SUSP_PE_Discord_Attachment_Oct21_1 {
   meta:
      description = "Detects suspicious executable with reference to a Discord attachment (often used for malware hosting on a legitimate FQDN)"
      author = "Florian Roth (Nextron Systems)"
      reference = "Internal Research"
      date = "2021-10-12"
      score = 70
      id = "7c217350-4a35-505d-950d-1bc989c14bc2"
   strings:
      $x1 = "https://cdn.discordapp.com/attachments/" ascii wide
   condition:
      uint16(0) == 0x5a4d
      and filesize < 5000KB 
      and 1 of them
}