Bugbear.B web backdoor

# SPDX-FileCopyrightText: 2005 StrongHoldNet
# 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("1.3.6.1.4.1.25623.1.0.11707");
  script_version("2023-06-27T05:05:30+0000");
  script_tag(name:"last_modification", value:"2023-06-27 05:05:30 +0000 (Tue, 27 Jun 2023)");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_name("Bugbear.B web backdoor");
  script_category(ACT_GATHER_INFO);
  script_family("Malware");
  script_copyright("Copyright (C) 2005 StrongHoldNet");
  script_dependencies("find_service.nasl", "httpver.nasl", "global_settings.nasl");
  script_require_ports("Services/www", 81);
  script_exclude_keys("Settings/disable_cgi_scanning");

  script_xref(name:"URL", value:"ftp://ftp.f-secure.com/anti-virus/tools/f-bugbr.zip");
  script_xref(name:"URL", value:"http://www.f-secure.com/v-descs/bugbear_b.shtml");

  script_tag(name:"solution", value:"Use your favorite antivirus to disinfect your
  system. Standalone disinfection tools also exist and is linked in the references.");

  script_tag(name:"summary", value:"Your system seems to be infected by the Bugbear.B virus
  (its backdoor has been detected on port 81).");

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

  exit(0);
}

include("http_func.inc");
include("http_keepalive.inc");
include("port_service_func.inc");

port = http_get_port(default:81);

url = string('/%NETHOOD%/');
req = http_get(item:url, port:port);
buf = http_keepalive_send_recv(port:port, data:req);
if(!buf) exit(0);
if(ereg(pattern:"^HTTP/[0-9]\.[0-9] 200 ", string:buf) && "Microsoft Windows Network" >< buf)
  security_message(port:port);