Exodus Android Spyware Detection

# Copyright (C) 2019 Greenbone Networks GmbH
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.108563");
  script_version("2021-04-16T06:57:08+0000");
  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_tag(name:"last_modification", value:"2021-04-16 06:57:08 +0000 (Fri, 16 Apr 2021)");
  script_tag(name:"creation_date", value:"2019-03-31 12:08:27 +0000 (Sun, 31 Mar 2019)");
  script_name("Exodus Android Spyware Detection");
  script_category(ACT_ATTACK);
  script_family("Malware");
  script_copyright("Copyright (C) 2019 Greenbone Networks GmbH");
  script_dependencies("find_service.nasl");
  script_require_ports(6200, 6842);

  script_tag(name:"summary", value:"The remote Android device seems to be infected by the Exodus spyware.");

  script_tag(name:"vuldetect", value:"- opens a connection to port 6200/tcp and/or 6842/tcp

  - sends an additional 'sh' command on port 6200/tcp

  - checks the response if the remote device is infected and provides a remote shell");

  script_tag(name:"solution", value:"A whole cleanup of the infected system is recommended.");

  script_xref(name:"URL", value:"https://www.securitywithoutborders.org/blog/2019/03/29/exodus.html");

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

  exit(0);
}

include("misc_func.inc");
include("host_details.inc");
include("os_func.inc");
include("socket_func.inc");

cmds = exploit_commands( "linux" );

foreach port( make_list( 6200, 6842 ) ) {

  if( ! get_port_state( port ) )
    continue;

  if( ! soc = open_sock_tcp( port ) )
    continue;

  if( port == 6200 ) {
    res = socket_send_recv( soc:soc, data:'sh\n', length:64 );
  } else {
    res = socket_send_recv( soc:soc, length:64 );
  }

  if( ! res || res !~ ":[/~].*[\$#]" ) {
    close( soc );
    continue;
  }

  foreach pattern( keys( cmds ) ) {

    cmd = cmds[ pattern ];

    res = socket_send_recv( soc:soc, data:cmd + '\n', length:64 );
    if( ! res )
      continue;

    if( egrep( pattern:pattern, string:res ) ) {
      close( soc );
      security_message( port:port, data:'The Exodus Android Spyware seems to be running at this port.\n\nResponse:\n\n' + res );
      exit( 0 );
    }
  }
  close( soc );
}

exit( 0 );