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--[[
Copyright (c) 2011-2016, Vsevolod Stakhov <vsevolod@highsecure.ru>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
]]--
local reconf = config['regexp']
reconf['HTML_META_REFRESH_URL'] = {
-- Requires options { check_attachements = true; }
re = '/<meta\\s+http-equiv="refresh"\\s+content="\\d+\\s*;\\s*url=/{sa_raw_body}i',
description = "Has HTML Meta refresh URL",
score = 5.0,
one_shot = true,
group = 'HTML'
}
reconf['HAS_DATA_URI'] = {
-- Requires options { check_attachements = true; }
re = '/data:[^\\/]+\\/[^; ]+;base64,/{sa_raw_body}i',
description = "Has Data URI encoding",
group = 'HTML',
one_shot = true,
}
reconf['DATA_URI_OBFU'] = {
-- Requires options { check_attachements = true; }
re = '/data:text\\/(?:plain|html);base64,/{sa_raw_body}i',
description = "Uses Data URI encoding to obfuscate plain or HTML in base64",
group = 'HTML',
one_shot = true,
score = 2.0
}
reconf['INTRODUCTION'] = {
re = '/\\b(?:my name is\\b|(?:i am|this is)\\s+(?:mr|mrs|ms|miss|master|sir|prof(?:essor)?|d(?:octo)?r|rev(?:erend)?)(?:\\.|\\b))/{sa_body}i',
description = "Sender introduces themselves",
score = 2.0,
one_shot = true,
group = 'scams'
}
-- Message contains a link to a .onion URI (Tor hidden service)
local onion_uri_v2 = '/[a-z0-9]{16}\\.onion?/{url}i'
local onion_uri_v3 = '/[a-z0-9]{56}\\.onion?/{url}i'
reconf['HAS_ONION_URI'] = {
re = string.format('(%s | %s)', onion_uri_v2, onion_uri_v3),
description = 'Contains .onion hidden service URI',
score = 0.0,
group = 'experimental'
}
local my_victim = [[/(?:victim|prey)/{words}]]
local your_webcam = [[/webcam/{words}]]
local your_onan = [[/(?:mast[ur]{2}bati(?:on|ng)|onanism|solitary)/{words}]]
local password_in_words = [[/^pass(?:(?:word)|(?:phrase))$/i{words}]]
local btc_wallet_address = [[/^[13][1-9a-km-zA-HJ-NP-Z]{25,34}$/]]
local wallet_word = [[/^wallet$/{words}]]
local broken_unicode = [[has_flag(bad_unicode)]]
reconf['LEAKED_PASSWORD_SCAM'] = {
re = string.format('%s{words} & (%s | %s | %s | %s | %s | %s | lua:check_data_images)',
btc_wallet_address, password_in_words, wallet_word,
my_victim, your_webcam, your_onan, broken_unicode),
description = 'Contains password word and BTC wallet address',
functions = {
check_data_images = function(task)
local tp = task:get_text_parts() or {}
for _,p in ipairs(tp) do
if p:is_html() then
local hc = p:get_html()
if hc and hc:has_property('data_urls') then
return true
end
end
end
return false
end
},
score = 7.0,
group = 'scams'
}
-- Special routine to validate bitcoin wallets
-- Prepare base58 alphabet
local fun = require "fun"
local off = 0
local base58_dec = fun.tomap(fun.map(
function(c)
off = off + 1
return c,(off - 1)
end,
"123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"))
local id = rspamd_config:register_symbol{
name = 'LEAKED_PASSWORD_SCAM_VALIDATED',
callback = function(task)
local rspamd_re = require "rspamd_regexp"
local hash = require "rspamd_cryptobox_hash"
local rspamd_logger = require "rspamd_logger"
if task:has_symbol('LEAKED_PASSWORD_SCAM') then
-- Perform BTC wallet check (quite expensive)
local wallet_re = rspamd_re.create_cached(btc_wallet_address)
local seen_valid = false
for _,tp in ipairs(task:get_text_parts()) do
local words = tp:get_words('raw') or {}
for _,word in ipairs(words) do
if wallet_re:match(word) then
-- We have something that looks like a BTC address
local bytes = {}
for i=1,25 do bytes[i] = 0 end
-- Base58 decode loop
fun.each(function(ch)
local acc = base58_dec[ch] or 0
for i=25,1,-1 do
acc = acc + (58 * bytes[i]);
bytes[i] = math.fmod(acc, 256);
acc = math.modf(acc / 256);
end
end, fun.tail(word)) -- Tail due to first byte is version
-- Now create a validation tag
local sha256 = hash.create_specific('sha256')
for i=1,21 do
sha256:update(string.char(bytes[i]))
end
sha256 = hash.create_specific('sha256', sha256:bin()):bin()
-- Compare tags
local valid = true
for i=1,4 do
if string.sub(sha256, i, i) ~= string.char(bytes[21 + i]) then
valid = false
end
end
if valid then
task:insert_result('LEAKED_PASSWORD_SCAM_VALIDATED', 1.0, word)
seen_valid = true
end
end
end
end
if not seen_valid then
task:insert_result('LEAKED_PASSWORD_SCAM_INVALID', 1.0)
end
end
end,
score = 0.0,
group = 'scams'
}
rspamd_config:register_symbol{
type = 'virtual',
name = 'LEAKED_PASSWORD_SCAM_INVALID',
parent = id,
score = 0.0,
}
rspamd_config:register_dependency('LEAKED_PASSWORD_SCAM_VALIDATED',
'LEAKED_PASSWORD_SCAM')
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