Windows_Trojan_CobaltStrike_91e08059

rule Windows_Trojan_CobaltStrike_91e08059 {
    meta:
        author = "Elastic Security"
        id = "91e08059-46a8-47d0-91c9-e86874951a4a"
        fingerprint = "d8baacb58a3db00489827275ad6a2d007c018eaecbce469356b068d8a758634b"
        creation_date = "2021-03-23"
        last_modified = "2021-08-23"
        description = "Identifies Post Ex module from Cobalt Strike"
        threat_name = "Windows.Trojan.CobaltStrike"
        severity = 100
        arch_context = "x86, arm64"
        scan_context = "file, memory"
        license = "Elastic License v2"
        os = "windows"
    strings:
        $a1 = "postex.x64.dll" ascii fullword
        $a2 = "postex.dll" ascii fullword
        $a3 = "RunAsAdminCMSTP" ascii fullword
        $a4 = "KerberosTicketPurge" ascii fullword
        $b1 = "GetSystem" ascii fullword
        $b2 = "HelloWorld" ascii fullword
        $b3 = "KerberosTicketUse" ascii fullword
        $b4 = "SpawnAsAdmin" ascii fullword
        $b5 = "RunAsAdmin" ascii fullword
        $b6 = "NetDomain" ascii fullword
    condition:
        2 of ($a*) or 4 of ($b*)
}