Snort mailing list archives
Re: Can Snort detect a download file from internet?
From: "Al Lewis \(allewi\) via Snort-sigs" <snort-sigs () lists snort org>
Date: Wed, 23 May 2018 04:17:53 +0000
Hello, See attached conf and pcap as an example. It is a http download of a PNG file (netbeans icon). The two alerts you should get are below: alewis@localhost snort-2.9.11-test]$ ./bin/snort -c etc/TAI.conf -r etc/TAI.pcap -Acmg -k none -q 10/13-09:55:36.078000 [**] [1:1000001:0] PNG file downloaded [**] [Priority: 0] {TCP} 173.37.145.84:80 -> 192.168.0.1:27785 Stream reassembled packet 10/13-09:55:36.078000 00:11:22:33:44:55 -> 00:55:44:33:22:11 type:0x800 len:0x92E 173.37.145.84:80 -> 192.168.0.1:27785 TCP TTL:64 TOS:0x0 ID:26637 IpLen:20 DgmLen:2336 ***A**** Seq: 0xC67 Ack: 0xB4A Win: 0x16D0 TcpLen: 20 48 54 54 50 2F 31 2E 31 20 32 30 30 20 4F 6B 0D HTTP/1.1 200 Ok. 0A 44 61 74 65 3A 20 57 65 64 2C 20 32 39 20 4A .Date: Wed, 29 J 75 6C 20 32 30 30 39 20 31 33 3A 33 35 3A 32 36 ul 2009 13:35:26 20 47 4D 54 0D 0A 53 65 72 76 65 72 3A 20 41 70 GMT..Server: Ap =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ 10/13-09:55:36.156000 [**] [1:1000001:0] PNG file downloaded [**] [Priority: 0] {TCP} 173.37.145.84:80 -> 192.168.0.1:27785 10/13-09:55:36.156000 00:11:22:33:44:55 -> 00:55:44:33:22:11 type:0x800 len:0x36 173.37.145.84:80 -> 192.168.0.1:27785 TCP TTL:64 TOS:0x0 ID:9066 IpLen:20 DgmLen:40 ***A***F Seq: 0x155F Ack: 0xB4A Win: 0x16D0 TcpLen: 20 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ Hope this helps. Thanks. Albert Lewis ENGINEER.SOFTWARE ENGINEERING Cisco Systems Inc. Email: allewi () cisco com<mailto:allewi () cisco com> From: Snort-sigs <snort-sigs-bounces () lists snort org> on behalf of Tai Ly via Snort-sigs <snort-sigs () lists snort org> Reply-To: Tai Ly <haotai1803 () gmail com> Date: Tuesday, May 22, 2018 at 8:41 PM To: "snort-sigs () lists snort org" <snort-sigs () lists snort org> Subject: Re: [Snort-sigs] Can Snort detect a download file from internet? When I use normal rule like: alert tcp any any -> any any (msg:"JPEG"; content:"|FF D8 FF E0|"; sid:1000001) Also there is no alert. It mean Snort does not catch data file when downloading from internet. So I think I configured wrong in somewhere. Do your guys have experience about this case? Thank you. On Tue, May 22, 2018 at 7:16 PM, Tai Ly <haotai1803 () gmail com<mailto:haotai1803 () gmail com>> wrote: Thank you for your help. I read this file and do some step as below: - Add some line in the end of snort.conf # File Inspect Configuration preprocessor file_inspect: type_id, signature, \ capture_queue_size 5000, \ capture_disk /home/file_capture/tmp/ # File magic reference include file_magic.conf - and I try with 2 rules: 1. alert (msg: "JPEG file"; gid:146; sid:70;) 2. alert tcp any any -> any any (msg: "JPEG file"; file_type:JPEG; sid:1000001) - I use this command to run snort: sudo snort -A console -q -u snort -g snort -c /etc/snort/snort.conf -i wlan0 But when I download JPEG file from internet , there is no alert. Do I missing somethings? On Tue, May 22, 2018 at 6:45 PM, Tai Ly <haotai1803 () gmail com<mailto:haotai1803 () gmail com>> wrote: Thank you for your help. I read this file and do some step as below: - Add some line in the end of snort.conf # File Inspect Configuration preprocessor file_inspect: type_id, signature, \ capture_queue_size 5000, \ capture_disk /home/file_capture/tmp/ # File magic reference include file_magic.conf - and I try with 2 rules: 1. alert (msg: "JPEG file"; gid:146; sid:70;) 2. alert tcp any any -> any any (msg: "JPEG file"; file_type:JPEG; sid:1000001) - I use this command to run snort: sudo snort -A console -q -u snort -g snort -c /etc/snort/snort.conf -i wlan0 But when I download JPEG file from internet , there is no alert. Do I missing somethings? On Tue, May 22, 2018 at 9:51 AM, Al Lewis (allewi) <allewi () cisco com<mailto:allewi () cisco com>> wrote: Yes. See the README.file in the docs directory. Albert Lewis ENGINEER.SOFTWARE ENGINEERING Cisco Systems Inc. Email: allewi () cisco com<mailto:allewi () cisco com> From: Snort-sigs <snort-sigs-bounces () lists snort org<mailto:snort-sigs-bounces () lists snort org>> on behalf of Hào Tài via Snort-sigs <snort-sigs () lists snort org<mailto:snort-sigs () lists snort org>> Reply-To: Hào Tài <haotai1803 () gmail com<mailto:haotai1803 () gmail com>> Date: Monday, May 21, 2018 at 8:50 PM To: "snort-sigs () lists snort org<mailto:snort-sigs () lists snort org>" <snort-sigs () lists snort org<mailto:snort-sigs () lists snort org>> Subject: Re: [Snort-sigs] Can Snort detect a download file from internet? Can everyone help me to confirm this point: " Can the Snort detect a file from the internet" ? If yes , how do we config the Snort the get the content file? On Sun, May 20, 2018 at 3:23 PM, Hào Tài <haotai1803 () gmail com<mailto:haotai1803 () gmail com>> wrote: Hello everyone, I am a newbie about Snort. I try to write the snort rule to catch a download JPG file from internet. Here is my rule:
alert tcp any any <> $HOME_NET any (msg:"JPEG"; content:"|FF D8 FF E0|"; sid:1000001)
But it does not work. Do I missing somethings or do I need to config somethings for Snort? Can everybody help me to find out the problem? Thank you. Regards, Tai Ly
Attachment:
TAI.conf
Description: TAI.conf
Attachment:
TAI.pcap
Description: TAI.pcap
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Current thread:
- Can Snort detect a download file from internet? Hào Tài via Snort-sigs (May 19)
- Re: Can Snort detect a download file from internet? Hào Tài via Snort-sigs (May 21)
- Re: Can Snort detect a download file from internet? Antonio Leding (May 21)
- Re: Can Snort detect a download file from internet? Antonio Leding (May 21)
- Re: Can Snort detect a download file from internet? Joel Esler (jesler) via Snort-sigs (May 21)
- Re: Can Snort detect a download file from internet? Antonio Leding (May 21)
- Re: Can Snort detect a download file from internet? Russ via Snort-sigs (May 21)
- Re: Can Snort detect a download file from internet? Antonio Leding (May 21)
- Re: Can Snort detect a download file from internet? Hào Tài via Snort-sigs (May 21)
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- Re: Can Snort detect a download file from internet? Tai Ly via Snort-sigs (May 22)
- Re: Can Snort detect a download file from internet? Tai Ly via Snort-sigs (May 22)
- Re: Can Snort detect a download file from internet? Al Lewis (allewi) via Snort-sigs (May 22)
- ?????? Can Snort detect a download file from internet? Zer0d0y via Snort-sigs (May 24)
- Re: 回复: Can Snort detect a download file from internet? James via Snort-sigs (May 24)