Re: port 22 scans + 53 scans

From: John Sage (jsageat_private)
Date: Mon Oct 08 2001 - 08:18:59 PDT

  • Next message: John Hall: "Re: Weird DNS scans"

    The tcp:53 probes seem to be some sort of distance-metrics/load 
    balancing activity.
    
    See:
    
    http://www.incidents.org/archives/intrusions/msg00702.html
    
    To quote:
    
    > These are likely probes to measure Round Trip Time for intelligent load
    > balancing using products similar to Cisco's Distributed Director
    > http://www.cisco.com/warp/public/cc/pd/cxsr/dd/tech/dd_wp.htm
    > 
    > Port 53 and the SYN/ACK flags are used in an attempt to bypass router filters
    > and firewal rules, thus getting a true RTT to the requesting client. That
    > allows serving content from the best available server.
    > 
    > If firewalls are dropping these packets, requesting clients may experience
    > delays receiving the requested content. Firewalls may receive repeated probes
    > from  confused content cacheing clients.
    > 
    > A frequently cited user of the SYN/ACK probing technique is Mirror Image
    > http://www.mirror-image.com
    > 
    > See inline for a couple of NSLookups that tend to support that. John is spot
    > on with his observation:
    > All packets have the Ack value one less than the value for Seq, e.g.,
    > Seq: 0x1BC3D89A  Ack: 0x1BC3D899
    > 
    > Matt Scarborough 2001-06-10
    > 
    > 
    
    
    Principle symptoms: ACK one less than SEQ for any given packet.
    
    - John
    
    -- 
    John Sage
    FinchHaven, Vashon Island, WA, USA
    http://www.finchhaven.com/
    mailto:jsageat_private
    "The web is so, like, five minutes ago..."
    
    
    Steven S wrote:
    
    > I got 1 probe from 131.152.102.64 @ 13:57 EDT today to port 22
    > 
    > then a flood (81 @ present) of port 53 connection attempts within about 2
    > minute time span, nothing before nothing after (so far)
    > 
    > notice that i got two port 53 attempts in a 12+ hour period then blam!
    > 
    > spoofed sources?
    > i was forwarding these packets to from my gateway/router to another host
    > for analysis (this the F at the end stands for Forward) but the host is
    > currently down for upgrading.
    > 
    > 
    > 
    > Oct  6 02:03:21 gw 1525: IP[Src=62.248.158.48 Dst=xxx.xxx.xxx.xxx TCP
    > spo=02925 dpo=00053]}S06>R06mF
    > Oct  6 07:00:54 gw 1525: IP[Src=216.153.214.84 Dst=xxx.xxx.xxx.xxx TCP
    > spo=03997  dpo=00053]}S06>R06mF
    > Oct  6 15:20:56 gw 1525: IP[Src=64.14.200.154 Dst=xxx.xxx.xxx.xxx TCP
    > spo=49722 dpo=00053]}S06>R06mF
    > Oct  6 15:20:56 gw 1525: IP[Src=216.35.167.58 Dst=xxx.xxx.xxx.xxx TCP
    > spo=53496 dpo=00053]}S06>R06mF
    > Oct  6 15:20:56 gw 1525: IP[Src=207.55.138.206 Dst=xxx.xxx.xxx.xxx TCP
    > spo=63217  dpo=00053]}S06>R06mF
    > Oct  6 15:20:56 gw 1525: IP[Src=208.184.162.71 Dst=xxx.xxx.xxx.xxx TCP
    > spo=57907  dpo=00053]}S06>R06mF
    > Oct  6 15:20:56 gw 1525: IP[Src=64.78.235.14 Dst=xxx.xxx.xxx.xxx TCP
    > spo=13583 dpo=00053]}S06>R06mF
    > Oct  6 15:20:56 gw 1525: IP[Src=216.34.68.2 Dst=xxx.xxx.xxx.xxx TCP
    > spo=51224  dpo=00053]}S06>R06mF
    > Oct  6 15:20:56 gw 1525: IP[Src=209.249.97.40 Dst=xxx.xxx.xxx.xxx TCP
    > spo=37503 dpo=00053]}S06>R06mF
    > Oct  6 15:20:56 gw 1525: IP[Src=216.33.35.214 Dst=xxx.xxx.xxx.xxx TCP
    > spo=54565 dpo=00053]}S06>R06mF
    > Oct  6 15:20:57 gw 1525: IP[Src=216.220.39.42 Dst=xxx.xxx.xxx.xxx TCP
    > spo=39303 dpo=00053]}S06>R06mF
    > Oct  6 15:20:57 gw 1525: IP[Src=193.148.15.128 Dst=xxx.xxx.xxx.xxx TCP
    > spo=48593 dpo=00053]}S06>R06mF
    > Oct  6 15:20:57 gw 1525: IP[Src=62.23.80.2 Dst=xxx.xxx.xxx.xxx TCP
    > spo=37779  dpo=00053]}S06>R06mF
    > Oct  6 15:20:57 gw 1525: IP[Src=194.205.125.26 Dst=xxx.xxx.xxx.xxx TCP
    > spo=57719  dpo=00053]}S06>R06mF
    > Oct  6 15:20:57 gw 1525: IP[Src=62.26.119.34 Dst=xxx.xxx.xxx.xxx TCP
    > spo=57174  dpo=00053]}S06>R06mF
    > Oct  6 15:20:57 gw 1525: IP[Src=64.56.174.186 Dst=xxx.xxx.xxx.xxx TCP
    > spo=52486  dpo=00053]}S06>R06mF
    > Oct  6 15:20:57 gw 1525: IP[Src=194.213.64.150 Dst=xxx.xxx.xxx.xxx TCP
    > spo=18133  dpo=00053]}S06>R06mF
    > Oct  6 15:20:57 gw 1525: IP[Src=64.37.200.46 Dst=xxx.xxx.xxx.xxx TCP
    > spo=15205  dpo=00053]}S06>R06mF
    > Oct  6 15:20:57 gw 1525: IP[Src=203.194.166.182 Dst=xxx.xxx.xxx.xxx TCP
    > spo=21712  dpo=00053]}S06>R06mF
    > Oct  6 15:20:57 gw 1525: IP[Src=202.139.133.129 Dst=xxx.xxx.xxx.xxx TCP
    > spo=55707  dpo=00053]}S06>R06mF
    > Oct  6 15:20:57 gw 1525: IP[Src=203.208.128.70 Dst=xxx.xxx.xxx.xxx TCP
    > spo=40535  dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=193.148.15.128 Dst=xxx.xxx.xxx.xxx TCP
    > spo=48593  dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=62.23.80.2 Dst=xxx.xxx.xxx.xxx TCP
    > spo=37923  dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=193.148.15.128 Dst=xxx.xxx.xxx.xxx TCP
    > spo=48739  dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=194.205.125.26 Dst=xxx.xxx.xxx.xxx TCP
    > spo=57860  dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=194.213.64.150 Dst=xxx.xxx.xxx.xxx TCP
    > spo=18277 dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=64.14.200.154 Dst=xxx.xxx.xxx.xxx TCP
    > spo=49897 dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=216.35.167.58 Dst=xxx.xxx.xxx.xxx TCP
    > spo=53671 dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=207.55.138.206 Dst=xxx.xxx.xxx.xxx TCP
    > spo=63392 dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=64.78.235.14 Dst=xxx.xxx.xxx.xxx TCP
    > spo=13758 dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=208.184.162.71 Dst=xxx.xxx.xxx.xxx TCP
    > spo=58084 dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=64.37.200.46 Dst=xxx.xxx.xxx.xxx TCP
    > spo=15380 dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=216.34.68.2 Dst=xxx.xxx.xxx.xxx TCP
    > spo=51399  dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=209.249.97.40 Dst=xxx.xxx.xxx.xxx TCP
    > spo=37678 dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=216.33.35.214 Dst=xxx.xxx.xxx.xxx TCP
    > spo=54752 dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=216.220.39.42 Dst=xxx.xxx.xxx.xxx TCP
    > spo=39418 dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=62.26.119.34 Dst=xxx.xxx.xxx.xxx TCP
    > spo=57349 dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=64.56.174.186 Dst=xxx.xxx.xxx.xxx TCP
    > spo=52661 dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=203.194.166.182 Dst=xxx.xxx.xxx.xxx TCP
    > spo=21896  dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=202.139.133.129 Dst=xxx.xxx.xxx.xxx TCP
    > spo=55882  dpo=00053]}S06>R06mF
    > Oct  6 15:20:59 gw 1525: IP[Src=203.208.128.70 Dst=xxx.xxx.xxx.xxx TCP
    > spo=40710  dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=216.35.167.58 Dst=xxx.xxx.xxx.xxx TCP
    > spo=53714 dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=209.249.97.40 Dst=xxx.xxx.xxx.xxx TCP
    > spo=37721 dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=216.33.35.214 Dst=xxx.xxx.xxx.xxx TCP
    > spo=54785 dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=207.55.138.206 Dst=xxx.xxx.xxx.xxx TCP
    > spo=63435 dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=64.78.235.14 Dst=xxx.xxx.xxx.xxx TCP
    > spo=13801 dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=64.37.200.46 Dst=xxx.xxx.xxx.xxx TCP
    > spo=15423 dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=64.14.200.154 Dst=xxx.xxx.xxx.xxx TCP
    > spo=49940 dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=208.184.162.71 Dst=xxx.xxx.xxx.xxx TCP
    > spo=58127  dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=216.34.68.2 Dst=xxx.xxx.xxx.xxx TCP
    > spo=51442  dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=194.205.125.26 Dst=xxx.xxx.xxx.xxx TCP
    > spo=57935  dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=62.23.80.2 Dst=xxx.xxx.xxx.xxx TCP
    > spo=37995  dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=193.148.15.128 Dst=xxx.xxx.xxx.xxx TCP
    > spo=48813  dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=62.26.119.34 Dst=xxx.xxx.xxx.xxx TCP
    > spo=57392 dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=194.213.64.150 Dst=xxx.xxx.xxx.xxx TCP
    > spo=18349  dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=64.56.174.186 Dst=xxx.xxx.xxx.xxx TCP
    > spo=52704 dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=203.194.166.182 Dst=xxx.xxx.xxx.xxx TCP
    > spo=21939  dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=202.139.133.129 Dst=xxx.xxx.xxx.xxx TCP
    > spo=55925  dpo=00053]}S06>R06mF
    > Oct  6 15:21:00 gw 1525: IP[Src=203.208.128.70 Dst=xxx.xxx.xxx.xxx TCP
    > spo=40753  dpo=00053]}S06>R06mF
    > Oct  6 15:21:01 gw 1525: IP[Src=193.148.15.128 Dst=xxx.xxx.xxx.xxx TCP
    > spo=48739  dpo=00053]}S06>R06mF
    > Oct  6 15:21:01 gw 1525: IP[Src=62.26.119.34 Dst=xxx.xxx.xxx.xxx TCP
    > spo=57349 dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=193.148.15.128 Dst=xxx.xxx.xxx.xxx TCP
    > spo=48813  dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=216.33.35.214 Dst=xxx.xxx.xxx.xxx TCP
    > spo=54935 dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=193.148.15.128 Dst=xxx.xxx.xxx.xxx TCP
    > spo=48954  dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=216.35.167.58 Dst=xxx.xxx.xxx.xxx TCP
    > spo=53890 dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=209.249.97.40 Dst=xxx.xxx.xxx.xxx TCP
    > spo=37895 dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=207.55.138.206 Dst=xxx.xxx.xxx.xxx TCP
    > spo=63609  dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=64.37.200.46 Dst=xxx.xxx.xxx.xxx TCP
    > spo=15597 dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=64.78.235.14 Dst=xxx.xxx.xxx.xxx TCP
    > spo=13975 dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=64.14.200.154 Dst=xxx.xxx.xxx.xxx TCP
    > spo=50114 dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=208.184.162.71 Dst=xxx.xxx.xxx.xxx TCP
    > spo=58301  dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=216.34.68.2 Dst=xxx.xxx.xxx.xxx TCP
    > spo=51616  dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=194.205.125.26 Dst=xxx.xxx.xxx.xxx TCP
    > spo=58101  dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=62.23.80.2 Dst=xxx.xxx.xxx.xxx TCP
    > spo=38161  dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=62.26.119.34 Dst=xxx.xxx.xxx.xxx TCP
    > spo=57566 dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=194.213.64.150 Dst=xxx.xxx.xxx.xxx TCP
    > spo=18515  dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=64.56.174.186 Dst=xxx.xxx.xxx.xxx TCP
    > spo=52878 dpo=00053]}S06>R06mF
    > Oct  6 15:21:02 gw 1525: IP[Src=203.194.166.182 Dst=xxx.xxx.xxx.xxx TCP
    > spo=22113  dpo=00053]}S06>R06mF
    > Oct  6 15:21:03 gw 1525: IP[Src=202.139.133.129 Dst=xxx.xxx.xxx.xxx TCP
    > spo=56099  dpo=00053]}S06>R06mF
    > Oct  6 15:21:03 gw 1525: IP[Src=203.208.128.70 Dst=xxx.xxx.xxx.xxx TCP
    > spo=40927  dpo=00053]}S06>R06mF
    > Oct  6 15:21:04 gw 1525: IP[Src=193.148.15.128 Dst=xxx.xxx.xxx.xxx TCP
    > spo=48954  dpo=00053]}S06>R06mF
    > 
    
    
    
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    This archive was generated by hypermail 2b30 : Mon Oct 08 2001 - 14:39:04 PDT