Re: sfportscan

["Al Lewis (allewi)" <allewi () cisco com>]

Also…. as a test can you run snort with  “-A cmg -H -U -k none -q” and see if you get events?


Albert Lewis
QA Software Engineer
SOURCEfire, Inc. now part of Cisco
9780 Patuxent Woods Drive
Columbia, MD 21046
Phone: (office) 443.430.7112
Email: allewi () cisco com

From: Al Lewis (allewi)
Sent: Friday, January 29, 2016 9:45 AM
To: Bassman Rod
Cc: snort-users () lists sourceforge net
Subject: Re: [Snort-users] sfportscan

Hello Rod,

                Do you have stream enabled? Is the traffic hitting the snort machine? What do you see in your exit 
stats?

I am able to get hits using your nmap command:

sudo nmap -rR 10.150.180.35


01/29-14:33:23.730867  [**] [116:434:1] (snort_decoder) WARNING: ICMP PING NMAP [**] [Classification: Attempted 
Information Leak] [Priority: 2] {ICMP} 10.0.2.15 -> 10.150.180.35
01/29-14:33:23.730867 08:00:27:D3:0B:60 -> 52:54:00:12:35:02 type:0x800 len:0x2A
10.0.2.15 -> 10.150.180.35 ICMP TTL:49 TOS:0x0 ID:26613 IpLen:20 DgmLen:28
Type:8  Code:0  ID:6531   Seq:0  ECHO

=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+


01/29-14:33:24.925695  [**] [122:1:1] (portscan) TCP Portscan [**] [Classification: Attempted Information Leak] 
[Priority: 2] {PROTO:255} 10.0.2.15 -> 10.150.180.35
01/29-14:33:24.925695 08:00:27:D3:0B:60 -> 52:54:00:12:35:02 type:0x800 len:0xA8
10.0.2.15 -> 10.150.180.35 PROTO:255 TTL:255 TOS:0x0 ID:4746 IpLen:20 DgmLen:154
50 72 69 6F 72 69 74 79 20 43 6F 75 6E 74 3A 20  Priority Count:
35 0A 43 6F 6E 6E 65 63 74 69 6F 6E 20 43 6F 75  5.Connection Cou
6E 74 3A 20 33 32 0A 49 50 20 43 6F 75 6E 74 3A  nt: 32.IP Count:
20 31 0A 53 63 61 6E 6E 65 72 20 49 50 20 52 61   1.Scanner IP Ra
6E 67 65 3A 20 31 30 2E 30 2E 32 2E 31 35 3A 31  nge: 10.0.2.15:1
30 2E 30 2E 32 2E 31 35 0A 50 6F 72 74 2F 50 72  0.0.2.15.Port/Pr
6F 74 6F 20 43 6F 75 6E 74 3A 20 33 31 0A 50 6F  oto Count: 31.Po
72 74 2F 50 72 6F 74 6F 20 52 61 6E 67 65 3A 20  rt/Proto Range:
31 3A 34 34 33 0A                                1:443.

=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+




Albert Lewis
QA Software Engineer
SOURCEfire, Inc. now part of Cisco
9780 Patuxent Woods Drive
Columbia, MD 21046
Phone: (office) 443.430.7112
Email: allewi () cisco com<mailto:allewi () cisco com>

From: Bassman Rod [mailto:rodbass63 () gmail com]
Sent: Thursday, January 28, 2016 4:19 PM
To: snort-users () lists sourceforge net<mailto:snort-users () lists sourceforge net>
Subject: [Snort-users] sfportscan

Resending with corrections.

Hi, I have Snort working and I see activity in the logs while I have a simple rule of detecting ICMP packets. But when 
I enabled sfportscan in the conf file and made sure the rule is being fired up upon restart, it is not detecting my 
port scans.

Scenario:
Snort is on global non-private IP of: 44.44.44.44 (fictitious IP for the sake of this email)

I fired  'nmap -rR 44.44.44.44' command several consecutive times from a box on my business network '192.168.1.XXX' 
network. I looked in my portscan.logs and it's empty.

snort.conf:
ipvar HOME_NET 192.168.10.0/24<http://192.168.10.0/24>
ipvar EXTERNAL_NET any

preprocessor sfportscan: proto  { all } memcap { 10000000 } sense_level { medium } scan_type { all } logfile { 
/var/log/snort/portscan.log }

I have preprocessor.rules enabled.

Any help will be greatly appreciated.

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