SUSP_ScreenConnect_User_PoC_Com_Used_Feb24

rule SUSP_ScreenConnect_User_PoC_Com_Used_Feb24 {
   meta:
      description = "Detects suspicious ScreenConnect user with poc.com email address, which is a sign of exploitation of the ConnectWise ScreenConnect (versions prior to 23.9.8) vulnerability with the POC released by WatchTower and the account was already used yet to login"
      author = "Florian Roth"
      reference = "https://github.com/watchtowrlabs/connectwise-screenconnect_auth-bypass-add-user-poc/blob/45e5b2f699a4d8f2d59ec3fc79a2e3c99db71882/watchtowr-vs-ConnectWise_2024-02-21.py#L53"
      date = "2024-02-23"
      score = 75
      id = "91990558-f145-5968-9722-b6815f6ad8d5"
   strings:
      $a1 = "<Users xmlns:xsi="
      $a2 = "<CreationDate>"

      $s1 = "@poc.com</Email>"

      $f1 = "<LastLoginDate>0001"
   condition:
      filesize < 200KB
      and all of ($a*)
      and $s1
      and not 1 of ($f*)
}