I am looking for some assistance in trying to identify the nature of
a suspected scan/attack against my corporate network.
The scan/attack includes spoofed source addresses that cover a wide range
of IP networks. There is also a relationship between source and
destination addresses and ports for each entry. Each combination of
address and port information appears between 3 and 8 times, all trickled
in over a 3 day period. Normally, something like this might be identified
as a TCP SYN SCAN, but the traffic is coming in too slowly and the destination
ports are all upper level ports (as you can see).
The pattern is one with which I am not familiar and would appreciate
your assistance in identifying.
Thnx,
Sorted by source IP:
Date/Time Source IP/Port Dest IP/Port
May 25 13:53:48 2.66.161.64:55518 XX6.X37.153.7:61323
May 26 04:34:53 2.66.161.64:55518 XX6.X37.153.7:61323
May 26 23:29:58 2.66.161.64:55518 XX6.X37.153.7:61323
May 27 08:20:55 2.66.161.64:55518 XX6.X37.153.7:61323
May 27 15:39:08 2.66.161.64:55518 XX6.X37.153.7:61323
May 26 12:03:34 2.71.250.0:54845 XX6.X37.54.171:5929
May 26 20:54:18 2.71.250.0:54845 XX6.X37.54.171:5929
May 27 16:49:56 2.71.250.0:54845 XX6.X37.54.171:5929
May 25 06:18:33 2.86.7.241:56883 XX6.X37.41.151:21012
May 25 10:16:48 2.86.7.241:56883 XX6.X37.41.151:21012
May 26 05:04:11 2.86.7.241:56883 XX6.X37.41.151:21012
May 27 07:28:50 2.86.7.241:56883 XX6.X37.41.151:21012
May 27 15:37:04 2.86.7.241:56883 XX6.X37.41.151:21012
May 27 16:28:04 2.86.7.241:56883 XX6.X37.41.151:21012
May 27 10:11:14 2.95.43.255:12430 XX6.X37.29.228:9577
May 25 08:30:38 2.95.43.255:12430 XX6.X37.29.228:9577
May 26 07:56:32 2.95.43.255:12430 XX6.X37.29.228:9577
May 26 18:55:34 2.95.43.255:12430 XX6.X37.29.228:9577
May 26 20:22:41 2.95.43.255:12430 XX6.X37.29.228:9577
Etc.
---break for brevity's sake---
6353 lines removed
May 26 05:38:31 221.237.154.247:45635 XX6.X37.48.56:8199
May 26 08:13:10 221.237.154.247:45635 XX6.X37.48.56:8199
May 26 09:23:33 221.237.154.247:45635 XX6.X37.48.56:8199
May 26 17:30:12 221.237.154.247:45635 XX6.X37.48.56:8199
May 27 09:55:22 221.237.154.247:45635 XX6.X37.48.56:8199
May 25 18:02:24 222.6.30.78:55945 XX6.X37.12.103:32430
May 26 23:28:25 222.6.30.78:55945 XX6.X37.12.103:32430
May 27 03:23:43 222.6.30.78:55945 XX6.X37.12.103:32430
May 26 09:12:56 222.12.8.159:40062 XX6.X37.39.135:43096
May 26 23:02:06 222.12.8.159:40062 XX6.X37.39.135:43096
May 26 23:53:30 222.12.8.159:40062 XX6.X37.39.135:43096
May 27 13:32:13 222.12.8.159:40062 XX6.X37.39.135:43096
May 26 12:28:58 222.20.24.164:3281 XX6.X37.21.175:27751
May 26 21:26:42 222.20.24.164:3281 XX6.X37.21.175:27751
May 26 22:10:47 222.20.24.164:3281 XX6.X37.21.175:27751
May 27 11:04:40 222.20.24.164:3281 XX6.X37.21.175:27751
May 27 13:31:51 222.20.24.164:3281 XX6.X37.21.175:27751
May 27 15:36:37 222.20.24.164:3281 XX6.X37.21.175:27751
Etc.
Captured Frame Sample:
Frame 1 (66 bytes on wire, 66 bytes captured)
Arrival Time: May 27, 2003 14:13:58.220746000
Time delta from previous packet: 0.000000000 seconds
Time relative to first packet: 0.000000000 seconds
Frame Number: 1
Packet Length: 66 bytes
Capture Length: 66 bytes
Ethernet II, Src: 00:00:0c:95:72:bd, Dst: 00:60:91:0b:45:35
Destination: 00:60:98:0d:45:35 (3Com_0d:45:35)
Source: 00:00:0c:95:78:bd (Cisco_95:78:bd)
Type: IP (0x0800)
Internet Protocol, Src Addr: 155.128.250.228 (155.128.250.228), Dst Addr:
XX6.X37.151.97 (XX6.X37.151.97)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 52
Identification: 0xb82b
Flags: 0x00
.0.. = Don't fragment: Not set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 118
Protocol: TCP (0x06)
Header checksum: 0xc248 (correct)
Source: 155.128.250.228 (155.128.250.228)
Destination: XX6.X37.151.97 (XX6.X37.151.97)
Transmission Control Protocol, Src Port: 866 (866), Dst Port: 26469 (26469),
Seq: 1409168989, Ack: 0, Len: 0
Source port: 866 (866)
Destination port: 26469 (26469)
Sequence number: 1409168989
Header length: 32 bytes
Flags: 0x0002 (SYN)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...0 .... = Acknowledgment: Not set
.... 0... = Push: Not set
.... .0.. = Reset: Not set
.... ..1. = Syn: Set
.... ...0 = Fin: Not set
Window size: 55808
Checksum: 0xd5a2 (correct)
Options: (12 bytes)
Maximum segment size: 1460 bytes
NOP
Window scale: 2 (multiply by 4)
NOP
NOP
SACK permitted
-----BEGIN PGP SIGNATURE-----
Note: This signature can be verified at https://www.hushtools.com/verify
Version: Hush 2.3
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Hello.
I am looking for some assistance in trying to identify the nature of
a suspected scan/attack against my corporate network.
The scan/attack includes spoofed source addresses that cover a wide range
of IP networks. There is also a relationship between source and
destination addresses and ports for each entry. Each combination of
address and port information appears between 3 and 8 times, all trickled
in over a 3 day period. Normally, something like this might be identified
as a TCP SYN SCAN, but the traffic is coming in too slowly and the destination
ports are all upper level ports (as you can see).
The pattern is one with which I am not familiar and would appreciate
your assistance in identifying.
Thnx,
Sorted by source IP:
Date/Time Source IP/Port Dest IP/Port
May 25 13:53:48 2.66.161.64:55518 XX6.X37.153.7:61323
May 26 04:34:53 2.66.161.64:55518 XX6.X37.153.7:61323
May 26 23:29:58 2.66.161.64:55518 XX6.X37.153.7:61323
May 27 08:20:55 2.66.161.64:55518 XX6.X37.153.7:61323
May 27 15:39:08 2.66.161.64:55518 XX6.X37.153.7:61323
May 26 12:03:34 2.71.250.0:54845 XX6.X37.54.171:5929
May 26 20:54:18 2.71.250.0:54845 XX6.X37.54.171:5929
May 27 16:49:56 2.71.250.0:54845 XX6.X37.54.171:5929
May 25 06:18:33 2.86.7.241:56883 XX6.X37.41.151:21012
May 25 10:16:48 2.86.7.241:56883 XX6.X37.41.151:21012
May 26 05:04:11 2.86.7.241:56883 XX6.X37.41.151:21012
May 27 07:28:50 2.86.7.241:56883 XX6.X37.41.151:21012
May 27 15:37:04 2.86.7.241:56883 XX6.X37.41.151:21012
May 27 16:28:04 2.86.7.241:56883 XX6.X37.41.151:21012
May 27 10:11:14 2.95.43.255:12430 XX6.X37.29.228:9577
May 25 08:30:38 2.95.43.255:12430 XX6.X37.29.228:9577
May 26 07:56:32 2.95.43.255:12430 XX6.X37.29.228:9577
May 26 18:55:34 2.95.43.255:12430 XX6.X37.29.228:9577
May 26 20:22:41 2.95.43.255:12430 XX6.X37.29.228:9577
Etc.
---break for brevity's sake---
6353 lines removed
May 26 05:38:31 221.237.154.247:45635 XX6.X37.48.56:8199
May 26 08:13:10 221.237.154.247:45635 XX6.X37.48.56:8199
May 26 09:23:33 221.237.154.247:45635 XX6.X37.48.56:8199
May 26 17:30:12 221.237.154.247:45635 XX6.X37.48.56:8199
May 27 09:55:22 221.237.154.247:45635 XX6.X37.48.56:8199
May 25 18:02:24 222.6.30.78:55945 XX6.X37.12.103:32430
May 26 23:28:25 222.6.30.78:55945 XX6.X37.12.103:32430
May 27 03:23:43 222.6.30.78:55945 XX6.X37.12.103:32430
May 26 09:12:56 222.12.8.159:40062 XX6.X37.39.135:43096
May 26 23:02:06 222.12.8.159:40062 XX6.X37.39.135:43096
May 26 23:53:30 222.12.8.159:40062 XX6.X37.39.135:43096
May 27 13:32:13 222.12.8.159:40062 XX6.X37.39.135:43096
May 26 12:28:58 222.20.24.164:3281 XX6.X37.21.175:27751
May 26 21:26:42 222.20.24.164:3281 XX6.X37.21.175:27751
May 26 22:10:47 222.20.24.164:3281 XX6.X37.21.175:27751
May 27 11:04:40 222.20.24.164:3281 XX6.X37.21.175:27751
May 27 13:31:51 222.20.24.164:3281 XX6.X37.21.175:27751
May 27 15:36:37 222.20.24.164:3281 XX6.X37.21.175:27751
Etc.
Captured Frame Sample:
Frame 1 (66 bytes on wire, 66 bytes captured)
Arrival Time: May 27, 2003 14:13:58.220746000
Time delta from previous packet: 0.000000000 seconds
Time relative to first packet: 0.000000000 seconds
Frame Number: 1
Packet Length: 66 bytes
Capture Length: 66 bytes
Ethernet II, Src: 00:00:0c:95:72:bd, Dst: 00:60:91:0b:45:35
Destination: 00:60:98:0d:45:35 (3Com_0d:45:35)
Source: 00:00:0c:95:78:bd (Cisco_95:78:bd)
Type: IP (0x0800)
Internet Protocol, Src Addr: 155.128.250.228 (155.128.250.228), Dst Addr:
XX6.X37.151.97 (XX6.X37.151.97)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 52
Identification: 0xb82b
Flags: 0x00
.0.. = Don't fragment: Not set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 118
Protocol: TCP (0x06)
Header checksum: 0xc248 (correct)
Source: 155.128.250.228 (155.128.250.228)
Destination: XX6.X37.151.97 (XX6.X37.151.97)
Transmission Control Protocol, Src Port: 866 (866), Dst Port: 26469 (26469),
Seq: 1409168989, Ack: 0, Len: 0
Source port: 866 (866)
Destination port: 26469 (26469)
Sequence number: 1409168989
Header length: 32 bytes
Flags: 0x0002 (SYN)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...0 .... = Acknowledgment: Not set
.... 0... = Push: Not set
.... .0.. = Reset: Not set
.... ..1. = Syn: Set
.... ...0 = Fin: Not set
Window size: 55808
Checksum: 0xd5a2 (correct)
Options: (12 bytes)
Maximum segment size: 1460 bytes
NOP
Window scale: 2 (multiply by 4)
NOP
NOP
SACK permitted
-----BEGIN PGP SIGNATURE-----
Note: This signature can be verified at https://www.hushtools.com/verify
Version: Hush 2.3
wkYEARECAAYFAj7dDSgACgkQbTw24P1BTGJXaQCgsLPS0niweOjKLZSIRKUVWioqoTAA
oIDwlD0AxJojtPAhIdlunJmyAG1R
=US/J
-----END PGP SIGNATURE-----
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