Security Incidents mailing list archives
R: [Pinguzilla] Weird Traffic
From: "Vega - Brunello Ivan" <I.Brunello () vegaspa it>
Date: Thu, 29 May 2008 10:47:45 +0200
Definitely an outbound connection value="52FC3B9C" showvalue="82.252.59.156" /> <field name="dst" longname="Destination address" size="4" pos="30" On most firewall I know, applying a rule does not interrupt an active session. I'd first reset all sessions, and then recheck firewall rules are correctly applied. Next, change firewall/filtering tecnology. Ivan Brunello -----Messaggio originale----- Da: Jonathan Adams [mailto:keirre.adams () gmail com] Inviato: mercoledì 28 maggio 2008 23.16 A: John Duksta Cc: incidents () securityfocus com Oggetto: Re: [Pinguzilla] Weird Traffic Well... I got the results of an 11hr TCPDUMP run.. and it shows... NOTHING.. a couple of probes, lots of network traffic (router messages, ARP requests, Windows NETBIOS noise from my ISP's lan) only got a few probes today... apparently the FW rules shut down most of the traffic for now. What is weird is this: my ipfw has this 07700 deny log ip from 82.0.0.0/8 to any 07800 deny log ip from any to 82.0.0.0/8 yet the TCP dump shows this: <pdml> <packet> <proto name="geninfo" longname="General information" pos="0" size="66"> <field name="num" longname="Number" showvalue="117" value="117" pos="0" size="66"/> <field name="linklayer" longname="Link Layer" showvalue="1" value="1" showmap="Ethernet" pos="0" size="66"/> <field name="len" longname="Packet Length" showvalue="66" value="66" pos="0" size="66"/> <field name="caplen" longname="Captured Length" showvalue="66" value="66" pos="0" size="66"/> <field name="timestamp" longname="Captured Time" showvalue="09:44:09.621223" value="1211982249.621223" pos="0" size="66"/> </proto> <proto name="ethernet" longname="Ethernet 802.3" pos="0" size="14"> <field name="dst" longname="MAC Destination" size="6" pos="0" value="000D6103491A" showvalue="000D61-03491A" showdtl="000D61-03491A (Unicast address, vendor code not available)" showmap="code not available" /> <field name="src" longname="MAC Source" size="6" pos="6" value="00D00247B3FC" showvalue="00D002-47B3FC" showdtl="00D002-47B3FC (Unicast address, vendor code not available)" showmap="code not available" /> <field name="type" longname="Ethertype - Length" size="2" pos="12" value="0800" showvalue="2048" showdtl="0x0800 (Ethertype)" /> </proto> <proto name="ip" longname="IPv4 (Internet Protocol version 4)" pos="14" size="20"> <field name="ver" longname="Version" size="1" pos="14" value="45" mask="f0" showvalue="4" /> <field name="hlen" longname="Header length" size="1" pos="14" value="45" mask="0f" showvalue="5" showdtl="20 (field value = 5)" /> <field name="tos" longname="Type of service" size="1" pos="15" value="00" showvalue="0x00" /> <field name="tlen" longname="Total length" size="2" pos="16" value="0034" showvalue="52" /> <field name="identification" longname="Identification" size="2" pos="18" value="3612" showvalue="13842" /> <field name="ffo" longname="Flags and Fragment offset" size="2" pos="20" > <field name="unused" longname="Unused" size="2" pos="20" value="4000" mask="8000" showvalue="0b0..............." /> <field name="df" longname="Don't fragment" size="2" pos="20" value="4000" mask="4000" showvalue="0b.1.............." /> <field name="mf" longname="More fragments" size="2" pos="20" value="4000" mask="2000" showvalue="0b..0............." /> <field name="foffset" longname="Fragment offset" size="2" pos="20" value="4000" mask="1fff" showvalue="0" showdtl="0 (field value = 0)" /> </field> <field name="ttl" longname="Time to live" size="1" pos="22" value="38" showvalue="56" /> <field name="nextp" longname="Next protocol" size="1" pos="23" value="06" showvalue="6" /> <field name="hchecksum" longname="Header Checksum" size="2" pos="24" value="452F" showvalue="0x452F" /> <field name="src" longname="Source address" size="4" pos="26" value="52FC3B9C" showvalue="82.252.59.156" /> <field name="dst" longname="Destination address" size="4" pos="30" value="4224F6C6" showvalue="66.36.246.198" /> </proto> <proto name="tcp" longname="TCP (Transmission Control Protocol)" pos="34" size="32"> <field name="sport" longname="Source port" size="2" pos="34" value="0D7D" showvalue="3453" /> <field name="dport" longname="Destination port" size="2" pos="36" value="0050" showvalue="80" /> <field name="seq" longname="Sequence number" size="4" pos="38" value="B20A5764" showvalue="2987022180" /> <field name="ack" longname="Acknowledgement Number" size="4" pos="42" value="00000000" showvalue="0" /> <field name="hlen" longname="Header length" size="2" pos="46" value="8002" mask="f000" showvalue="8" showdtl="32 (field value = 8)" /> <field name="res" longname="Reserved (must be zero)" size="2" pos="46" value="8002" mask="0fc0" showvalue="0x0000" /> <field name="flags" longname="Flags" size="2" pos="46" value="8002" mask="003f" showvalue="0x0002" > <field name="urg" longname="Urgent pointer" size="2" pos="46" value="8002" mask="0020" showvalue="0b..........0....." /> <field name="ackf" longname="Ack valid" size="2" pos="46" value="8002" mask="0010" showvalue="0b...........0...." /> <field name="push" longname="Push requested" size="2" pos="46" value="8002" mask="0008" showvalue="0b............0..." /> <field name="rst" longname="Reset requested" size="2" pos="46" value="8002" mask="0004" showvalue="0b.............0.." /> <field name="syn" longname="Syn requested" size="2" pos="46" value="8002" mask="0002" showvalue="0b..............1." /> <field name="fin" longname="Fin requested" size="2" pos="46" value="8002" mask="0001" showvalue="0b...............0" /> </field> <field name="win" longname="Window size" size="2" pos="48" value="FFFF" showvalue="65535" /> <field name="crc" longname="Checksum" size="2" pos="50" value="9085" showvalue="0x9085" /> <field name="urg" longname="Urgent Pointer" size="2" pos="52" value="0000" showvalue="0x0000" /> <field name="options" longname="TCP Options" size="12" pos="54" > <field name="mss" longname="Maximum Segment Size" size="4" pos="54" > <field name="type" longname="Type" size="1" pos="54" value="02" showvalue="2" /> <field name="length" longname="Option length" size="1" pos="55" value="04" showvalue="4" /> <field name="maxssize" longname="Maximum Segment Size" size="2" pos="56" value="0584" showvalue="1412" /> </field> <field name="noperation" longname="No Operation" size="1" pos="58" > <field name="type" longname="Type" size="1" pos="58" value="01" showvalue="1" /> </field> <field name="winscale" longname="TCP Windows Scale Option" size="3" pos="59" > <field name="type" longname="Type" size="1" pos="59" value="03" showvalue="3" /> <field name="length" longname="Option Length" size="1" pos="60" value="03" showvalue="3" /> <field name="shift.cnt" longname="Shift Count" size="1" pos="61" value="04" showvalue="4" /> </field> <field name="noperation" longname="No Operation" size="1" pos="62" > <field name="type" longname="Type" size="1" pos="62" value="01" showvalue="1" /> </field> <field name="noperation" longname="No Operation" size="1" pos="63" > <field name="type" longname="Type" size="1" pos="63" value="01" showvalue="1" /> </field> <field name="sackpermitted" longname="Sack-Permitted Option" size="2" pos="64" > <field name="type" longname="Type" size="1" pos="64" value="04" showvalue="4" /> <field name="length" longname="Option Length" size="1" pos="65" value="02" showvalue="2" /> </field> </field> </proto> </packet></pdml> On Wed, May 28, 2008 at 5:20 AM, Jonathan Adams <keirre.adams () gmail com> wrote:
John, I am running late for my real job :) but when i come back Ill run some more test and post the results. BTW, 1.5 GB transferred yesterday. there is no way this is valid web or ftp traffic... something is proxying through my box... Im sure of it On Tue, May 27, 2008 at 11:06 PM, John Duksta <john () duksta org> wrote:Jonathan, I'd be curious to get a copy of the list of networks that you're seeing this traffic from. I work for a large managed security service provider and I could cross reference these networks against data that we're seeing from our corporate customers. Regards, -john On May 27, 2008, at 7:59 AM, Jonathan Adams wrote:All, I have a leased server I use to host some websites and for the past week I have been getting traffic warnings. The server has been transferring > 1GB of data per day, which is unusually high, especially since I moved my mail to Google Apps. I have noticed a ridiculous amount of attempted proxying attemptes in my logs, but I do not have mod proxy turned on. I suspect my server is on some list. I firewalled off a large number of subnets from China and my traffic dropped for a few days, then this morning, 2735MB transferred in 24 hrs. As of right now, I am planning to blackhole all China traffic, since thats where most of this is comming from, along with the occasional traffic from France and other places in Eur. Is this common? If so are there any other remedies? -- "Strength does not come from physical capacity. It comes from an indomitable will." - Mohandas Gandhi _______________________________________________ Pinguzilla mailing list Pinguzilla () as220 org http://www.as220.org/mailman/listinfo/pinguzilla-- ___________________________ Jon Adams web: http://www.scis.nova.edu/~jonaadam mail: keirre.adams () gmail com --------------------------------------------- "Strength does not come from physical capacity. It comes from an indomitable will." - Mohandas Gandhi
-- ___________________________ Jon Adams web: http://www.scis.nova.edu/~jonaadam mail: keirre.adams () gmail com --------------------------------------------- "Strength does not come from physical capacity. It comes from an indomitable will." - Mohandas Gandhi
Current thread:
- Re: Weird Traffic, (continued)
- Message not available
- Re: Weird Traffic Jonathan Adams (May 27)
- Re: Weird Traffic Gary Baribault (May 27)
- Re: Weird Traffic Michael Gorsuch (May 27)
- Re: Weird Traffic Richard Sammet (May 28)
- Message not available
- Message not available
- Re: Weird Traffic Jonathan Adams (May 27)
- Message not available
- Re: Weird Traffic Jonathan Adams (May 28)
- Re: [Pinguzilla] Weird Traffic Jonathan Adams (May 28)
- Re: [Pinguzilla] Weird Traffic Jonathan Adams (May 28)
- R: [Pinguzilla] Weird Traffic Vega - Brunello Ivan (May 29)
- Re: [Pinguzilla] Weird Traffic Leon Ward (May 29)
- Re: [Pinguzilla] Weird Traffic Jonathan Adams (May 29)