Nautilus_rc4_key

rule Nautilus_rc4_key {
    meta:
        description = "Rule for detection of Nautilus based on a hardcoded RC4 key"
        author = "NCSC UK"
        hash = "a415ab193f6cd832a0de4fcc48d5f53d6f0b06d5e13b3c359878c6c31f3e7ec3"
        date = "2017/11/23"
        reference = "https://www.ncsc.gov.uk/alerts/turla-group-malware"
        id = "124c8b95-46fb-5cc1-9b10-b10536e1781d"
    strings:
        $key = {31 42 31 34 34 30 44 39 30 46 43 39 42 43 42 34 36 41 39 41 43 39 36 34 33 38 46 45 45 41 38 42}
    condition:
        (uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550) and $key
}