YARA Detection (SSH)

# SPDX-FileCopyrightText: 2019 Greenbone AG
# 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("1.3.6.1.4.1.25623.1.0.112478");
  script_version("2023-07-25T05:05:58+0000");
  script_tag(name:"last_modification", value:"2023-07-25 05:05:58 +0000 (Tue, 25 Jul 2023)");
  script_tag(name:"creation_date", value:"2019-01-08 09:26:12 +0100 (Tue, 08 Jan 2019)");
  script_tag(name:"cvss_base", value:"0.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:N");
  script_name("YARA Detection (SSH)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2019 Greenbone AG");
  script_family("Product detection");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("login/SSH/success");
  script_exclude_keys("ssh/no_linux_shell");

  script_tag(name:"summary", value:"Detects via SSH if YARA is installed on the target
  host.");

  script_tag(name:"qod_type", value:"executable_version");

  exit(0);
}

include("ssh_func.inc");
include("cpe.inc");
include("host_details.inc");

sock = ssh_login_or_reuse_connection();
if( ! sock )
  exit( 0 );

full_path_list = ssh_find_file( file_name:"/yara$", sock:sock, useregex:TRUE );
if( ! full_path_list ) {
  ssh_close_connection();
  exit( 0 );
}

foreach full_path( full_path_list ) {

  full_path = chomp( full_path );

  #exclude hidden directories
  if( ! full_path || "/." >< full_path )
    continue;

  vers = ssh_get_bin_version( full_prog_name:full_path, sock:sock, version_argv:"-v", ver_pattern:"([0-9.]{3,})" );

  if( vers[1] ) {
    version = vers[1];
    set_kb_item( name:"yara/detected", value:TRUE );
    set_kb_item( name:"yara/ssh/detected", value:TRUE );
    register_and_report_cpe( app:"YARA", ver:version, base:"cpe:/a:virustotal:yara:", expr:"([0-9.]+)", regPort:0, insloc:full_path, concluded:vers[0], regService:"ssh-login" );
  }
}

ssh_close_connection();
exit( 0 );