Windows_Trojan_CobaltStrike_d00573a3

rule Windows_Trojan_CobaltStrike_d00573a3 {
    meta:
        author = "Elastic Security"
        id = "d00573a3-db26-4e6b-aabf-7af4a818f383"
        fingerprint = "b6fa0792b99ea55f359858d225685647f54b55caabe53f58b413083b8ad60e79"
        creation_date = "2021-03-23"
        last_modified = "2021-08-23"
        description = "Identifies Screenshot 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 = "screenshot.x64.dll" ascii fullword
        $a2 = "screenshot.dll" ascii fullword
        $a3 = "\\\\.\\pipe\\screenshot" ascii fullword
        $b1 = "1I1n1Q3M5Q5U5Y5]5a5e5i5u5{5" ascii fullword
        $b2 = "GetDesktopWindow" ascii fullword
        $b3 = "CreateCompatibleBitmap" ascii fullword
        $b4 = "GDI32.dll" ascii fullword
        $b5 = "ReflectiveLoader"
        $b6 = "Adobe APP14 marker: version %d, flags 0x%04x 0x%04x, transform %d" ascii fullword
    condition:
        2 of ($a*) or 5 of ($b*)
}