Chasebot

alert tcp any any -> any $HTTP_PORTS (msg:"ChaseBot Detected"; flow:to_server,established; content:"btc=ChaseLogBAD"; http_uri; depth:30; classtype:trojan-activity; sid:20166289; rev:1; metadata:created_at 2019_03_24;)

rule Chasebot_bin
{
    meta:
        description = "Chasebot Brute Forcer"
        author = "James_inthe_box"
        reference = "https://app.any.run/tasks/f435d89d-30a5-465b-8a8d-b7a042665e0e"
        date = "2019/03"
        maltype = "Bruteforce"

    strings:
        $string1 = "&auth_passwd=" wide
        $string2 = "&auth_passwd_org" wide
        $string3 = "temp.txt" wide
        $string4 = "get_Cookies"
        $string5 = "set_Cookies"
        $string6 = "DownloadFile"

    condition:
        uint16(0) == 0x5A4D and all of ($string*) and filesize < 500KB
}

rule Chasebot_mem
{
    meta:
        description = "Chasebot Brute Forcer"
        author = "James_inthe_box"
        reference = "https://app.any.run/tasks/f435d89d-30a5-465b-8a8d-b7a042665e0e"
        date = "2019/03"
        maltype = "Bruteforce"

    strings:
        $string1 = "&auth_passwd=" wide
        $string2 = "&auth_passwd_org" wide
        $string3 = "temp.txt" wide
        $string4 = "get_Cookies"
        $string5 = "set_Cookies"
        $string6 = "DownloadFile"

    condition:
        all of ($string*) and filesize > 500KB
}