APT_SUSP_NK_3CX_RC4_Key_Mar23_1

rule APT_SUSP_NK_3CX_RC4_Key_Mar23_1 {
   meta:
      description = "Detects RC4 key used in 3CX binaries known to be malicious"
      author = "Florian Roth (Nextron Systems)"
      date = "2023-03-29"
      reference = "https://www.reddit.com/r/crowdstrike/comments/125r3uu/20230329_situational_awareness_crowdstrike/"
      score = 70
      hash1 = "7986bbaee8940da11ce089383521ab420c443ab7b15ed42aed91fd31ce833896"
      hash2 = "59e1edf4d82fae4978e97512b0331b7eb21dd4b838b850ba46794d9c7a2c0983"
      hash3 = "aa124a4b4df12b34e74ee7f6c683b2ebec4ce9a8edcf9be345823b4fdcf5d868"
      hash4 = "c485674ee63ec8d4e8fde9800788175a8b02d3f9416d0e763360fff7f8eb4e02"
      id = "18ea2185-11a1-51ad-a51a-df9e6357bb58"
   strings:
      $x1 = "3jB(2bsG#@c7"
   condition:
      ( uint16(0) == 0xcfd0 or uint16(0) == 0x5a4d )
      and $x1
}