Firebird RAT

snort / suricata
alert tcp any any -> any any (msg:"Firebird RAT Detected"; flow:to_server,established; flags:PA; content:"|0001000000ffffffff01000000000000000601000000|"; depth:32; classtype:trojan-activity; sid:20166317; rev:1; metadata:created_at 2020_03_11;)

yara
rule Firebird_RAT_bin
{
    meta:
        description = "Firebird RAT"
        author = "James_inthe_box"
        reference = ""
        date = "2020/3"
        maltype = "RAT"

    strings:
        $string1 = "SECAM_K1" ascii
        $string2 = "SECAM_L1" ascii
        $string3 = "Firebird" ascii
        $string4 = "BrowserVNC" ascii
        $string5 = "XOR_Universal" ascii
        $string6 = "UploadScreenshots" ascii

    condition:
        uint16(0) == 0x5A4D and all of ($string*) and filesize < 800KB
}

rule Firebird_RAT_mem
{
    meta:
        description = "Firebird RAT"
        author = "James_inthe_box"
        reference = ""
        date = "2020/3"
        maltype = "RAT"

    strings:
        $string1 = "SECAM_K1" ascii
        $string2 = "SECAM_L1" ascii
        $string3 = "Firebird" ascii
        $string4 = "BrowserVNC" ascii
        $string5 = "XOR_Universal" ascii
        $string6 = "UploadScreenshots" ascii

    condition:
        all of ($string*) and filesize > 800KB
}