Kibuv worm detection

# SPDX-FileCopyrightText: 2005 Michel Arboi
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.18367");
  script_version("2023-08-01T13:29:10+0000");
  script_tag(name:"last_modification", value:"2023-08-01 13:29:10 +0000 (Tue, 01 Aug 2023)");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_name("Kibuv worm detection");
  script_category(ACT_GATHER_INFO);
  script_tag(name:"qod_type", value:"remote_banner");
  script_copyright("Copyright (C) 2005 Michel Arboi");
  script_family("Malware");
  script_dependencies("ftpserver_detect_type_nd_version.nasl");
  # nb: Trend says 7955 but I saw it on 14920 and 42260
  script_require_ports("Services/ftp", 7955);
  script_mandatory_keys("ftp/banner/available");

  script_xref(name:"URL", value:"http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_KIBUV.B&VSect=T");

  script_tag(name:"solution", value:"Patch your system and run an antivirus.");

  script_tag(name:"summary", value:"A fake FTP server was installed by the KIBUV.B worm
  on this port. This worm uses known security flaws to infect the system.

  This machine may already be a 'zombi' used by attackerss
  to perform distributed denial of service.");

  script_tag(name:"solution_type", value:"Mitigation");

  exit(0);
}

include("ftp_func.inc");
include("misc_func.inc");
include("port_service_func.inc");

port = ftp_get_port(default:7955);
b = ftp_get_banner(port: port);
if(!b)
  exit(0);

if ('220 StnyFtpd 0wns j0' >< b ||
    # I also saw that banner, I guess this is a variant
    '220 fuckFtpd 0wns j0' >< b)
{
  set_kb_item(name: 'ftp/'+port+'/backdoor', value: 'KIBUV.B');
  set_kb_item(name: 'ftp/backdoor', value: 'KIBUV.B');
  security_message(port);
}