APT_NK_MAL_M_Hunting_VEILEDSIGNAL_4

rule APT_NK_MAL_M_Hunting_VEILEDSIGNAL_4 {
   meta:
      description = "Detects VEILEDSIGNAL malware"
      author = "Mandiant"
      score = 75
      disclaimer = "This rule is meant for hunting and is not tested to run in a production environment"
      hash1 = "404b09def6054a281b41d309d809a428" 
      hash2 = "c6441c961dcad0fe127514a918eaabd4"
      reference = "https://www.mandiant.com/resources/blog/3cx-software-supply-chain-compromise"
      date = "2023-04-20"
      id = "379e6471-3c4f-5c72-b8fd-17f481e89ac6"
   strings:
      $sb1 = { FF 15 FC 76 01 00 8B F0 85 C0 74 ?? 8D 50 01 [6-16] FF 15 [4] 48 8B D8 48 85 C0 74 ?? 89 ?? 24 28 44 8B CD 4C 8B C? 48 89 44 24 20 }
      $sb2 = { 33 D2 33 C9 FF 15 [4] 4C 8B CB 4C 89 74 24 28 4C 8D 05 [2] FF FF 44 89 74 24 20 33 D2 33 C9 FF 15 }
      $si1 = "CreateThread" fullword
      $si2 = "MultiByteToWideChar" fullword
      $si3 = "LocalAlloc" fullword
      $se1 = "DllGetClassObject" fullword
   condition:
      (uint16(0) == 0x5A4D) and (uint32(uint32(0x3C)) == 0x00004550) and (uint16(uint32(0x3C)+0x18) == 0x020B) and all of them
}