ddos 攻击的可能形式？

Question

我以前有点问过这个。我已经建立了一个服务器来为我的网站、dns 和一些游戏服务器提供服务。但是，当我检查我的路由器防火墙日志时，我在同一端口上阻止了很多传入的 UDP 数据包。这是它的样子，请注意端口不正常，并且没有打开或使用。

    [INFO] Sat Aug 25 21:25:09 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:25:05 2012 Blocked incoming UDP packet from 186.227.20.17:21401 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:25:05 2012 Blocked incoming UDP packet from 117.203.8.239:14090 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:25:03 2012 Blocked incoming UDP packet from 77.35.1.215:49001 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:24:53 2012 Blocked incoming UDP packet from 90.180.165.121:10011 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:24:51 2012 Blocked incoming UDP packet from 190.51.167.28:22486 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:24:45 2012 Blocked incoming UDP packet from 159.224.93.23:25946 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:24:44 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:24:43 2012 Blocked incoming UDP packet from 62.63.214.200:62348 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:24:40 2012 Blocked incoming UDP packet from 43.244.112.201:45811 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:24:30 2012 Blocked incoming UDP packet from 78.8.169.255:1236 to 84.234.160.79:28018
[INFO] Sat Aug 25 21:24:30 2012 Blocked incoming UDP packet from 91.205.238.31:16672 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:24:29 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:24:19 2012 Blocked incoming UDP packet from 213.115.74.42:50839 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:24:13 2012 Blocked incoming UDP packet from 142.68.127.231:40886 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:24:09 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:59 2012 Blocked incoming UDP packet from 87.14.231.178:21360 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:56 2012 Blocked incoming UDP packet from 109.202.150.81:53385 to 84.234.160.79:28018
[INFO] Sat Aug 25 21:23:54 2012 Blocked incoming UDP packet from 83.183.5.227:53786 to 84.234.160.79:28015
[INFO] Sat Aug 25 21:23:53 2012 Blocked incoming UDP packet from 1.228.6.35:29826 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:23:49 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:42 2012 Blocked incoming UDP packet from 109.202.150.81:53371 to 84.234.160.79:28018
[INFO] Sat Aug 25 21:23:41 2012 Blocked incoming UDP packet from 84.90.108.176:49686 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:39 2012 Blocked incoming UDP packet from 186.178.118.94:10063 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:38 2012 Blocked incoming UDP packet from 217.122.204.212:41446 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:36 2012 Blocked incoming UDP packet from 82.33.127.120:18441 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:35 2012 Blocked incoming UDP packet from 81.19.46.234:1183 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:23:33 2012 Blocked incoming UDP packet from 94.69.159.219:63959 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:31 2012 Blocked incoming UDP packet from 83.68.239.193:21808 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:29 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:22 2012 Blocked incoming UDP packet from 109.202.150.81:53370 to 84.234.160.79:28018
[INFO] Sat Aug 25 21:23:21 2012 Blocked incoming UDP packet from 188.27.241.206:55403 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:20 2012 Blocked incoming UDP packet from 189.24.110.248:61712 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:23:13 2012 Blocked incoming UDP packet from 96.50.2.51:15432 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:09 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:23:03 2012 Blocked incoming UDP packet from 37.128.216.210:57785 to 84.234.160.79:28018
[INFO] Sat Aug 25 21:22:58 2012 Blocked incoming UDP packet from 115.37.98.215:24347 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:22:50 2012 Blocked incoming UDP packet from 23.24.147.209:28970 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:22:47 2012 Blocked incoming UDP packet from 86.11.74.217:45682 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:22:46 2012 Blocked incoming UDP packet from 201.249.81.218:42176 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:22:44 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:22:41 2012 Blocked incoming UDP packet from 78.36.218.169:25903 to 84.234.160.79:14953
[INFO] Sat Aug 25 21:22:24 2012 Blocked incoming UDP packet from 176.212.55.166:49001 to 84.234.160.79:61767
[INFO] Sat Aug 25 21:22:21 2012 Blocked incoming TCP packet from 86.100.65.148:58771 to 84.234.160.79:80 as RST:ACK received but there is no active connection
[INFO] Sat Aug 25 21:22:21 2012 Blocked incoming TCP packet from 86.100.65.148:58775 to 84.234.160.79:80 as RST:ACK received but there is no active connection
[INFO] Sat Aug 25 21:22:21 2012 Blocked incoming TCP packet from 86.100.65.148:58776 to 84.234.160.79:80 as RST:ACK received but there is no active connection
[INFO] Sat Aug 25 21:22:21 2012 Blocked incoming TCP packet from 86.100.65.148:58777 to 84.234.160.79:80 as RST:ACK received but there is no active connection
[INFO] Sat Aug 25 21:22:21 2012 Blocked incoming TCP packet from 86.100.65.148:58769 to 84.234.160.79:80 as RST:ACK received but there is no active connection
[INFO] Sat Aug 25 21:22:19 2012 Blocked incoming UDP packet from 201.80.163.51:40668 to 84.234.160.79:61767

请注意，被阻止的常见端口是“61767”，它们开始使用“14953”。而且它一直来，日志比这多，那我该怎么办？服务的开放端口为 1996:Remote desktop、143:imap、110:pop3、25:smtp、80:http、443:https、53:dns。而对于游戏服务器 ort，我打开了 27000-27900 范围，因为我在军团要塞 2 中使用 Srcds 服务器。那我该怎么办？从昨天开始就一直来，为什么？不知道。

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捕获了一个 UDP 数据包 @ UDP 61767

00000000  64 31 3A 61 64 32 3A 69  64 32 30 3A 77 97 D9 57   d1:ad2:i d20:w..W 
00000010  FD 9B 37 AD 46 7A 55 32  C8 81 04 A7 36 D9 CE E1   ..7.FzU2 ....6... 
00000020  36 3A 74 61 72 67 65 74  32 30 3A 77 9D 1A BA E9   6:target 20:w.... 
00000030  FF 51 96 85 6E 0A 7C A6  FA 59 C0 69 40 37 36 65   .Q..n.|. .Y.i@76e 
00000040  31 3A 71 39 3A 66 69 6E  64 5F 6E 6F 64 65 31 3A   1:q9:fin d_node1: 
00000050  74 34 3A F2 0A 00 00 31  3A 76 34 3A 55 54 40 76   t4:....1 :v4:UT@v 
00000060  31 3A 79 31 3A 71 65                               1:y1:qe

数据包 2

00000000  64 31 3A 61 64 32 3A 69  64 32 30 3A A4 C6 64 B6   d1:ad2:i d20:..d. 
00000010  60 41 16 2E 34 E3 71 0F  34 4B DE 45 DB 27 BE E4   `A..4.q. 4K.E.'.. 
00000020  39 3A 69 6E 66 6F 5F 68  61 73 68 32 30 3A 77 9D   9:info_h ash20:w. 
00000030  1C A3 5B C9 67 67 97 1B  4D 4D D0 82 98 5F B8 6B   ..[.gg.. MM..._.k 
00000040  B2 7F 36 3A 6E 6F 73 65  65 64 69 31 65 36 3A 73   .6:nose edi1e6:s 
00000050  63 72 61 70 65 69 31 65  34 3A 77 61 6E 74 6C 32   crapei1e 4:wantl2 
00000060  3A 6E 34 32 3A 6E 36 65  65 31 3A 71 39 3A 67 65   :n42:n6e e1:q9:ge 
00000070  74 5F 70 65 65 72 73 31  3A 74 32 3A D8 B2 31 3A   t_peers1 :t2:..1: 
00000080  76 34 3A 5A 6F 00 06 31  3A 79 31 3A 71 65         v4:Zo..1 :y1:qe

---

UTC 上午 02:24 + 01:00 发布：看起来已经结束了，所以停止时很好。

Answer 1

看起来像 BitTorrent 对等查询流量。

系统可能注册了一个跟踪器——有没有可能在机器上运行 BitTorrent 客户端（或者通过 NAT 运行在它后面的东西）？

顺便说一下，您的系统需要的文件的哈希值在第二个数据包中。我将把它留给读者作为练习，以找出它是什么文件。