SUSP_AnyDesk_Compromised_Certificate_Jan24_1

rule SUSP_AnyDesk_Compromised_Certificate_Jan24_1 {
   meta:
      description = "Detects binaries signed with a compromised signing certificate of AnyDesk that aren't AnyDesk itself (philandro Software GmbH, 0DBF152DEAF0B981A8A938D53F769DB8; strict version)"
      date = "2024-02-02"
      author = "Florian Roth"
      reference = "https://anydesk.com/en/public-statement"
      score = 75
      id = "8d172b04-f7f7-54df-b30c-3ee17d3cca12"
   strings:
      $a1 = "AnyDesk Software GmbH" wide
   condition:
      uint16(0) == 0x5a4d 
      and not $a1
      and for any i in (0 .. pe.number_of_signatures) : (
         pe.signatures[i].issuer contains "DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1" and
         pe.signatures[i].serial == "0d:bf:15:2d:ea:f0:b9:81:a8:a9:38:d5:3f:76:9d:b8"
      )
}