Weekly spam summary on March 24th, 2007

March 24, 2007

This week, we:

  • got 12,733 messages from 249 different IP addresses.
  • handled 21,567 sessions from 1,259 different IP addresses.
  • received 197,829 connections from at least 58,846 different IP addresses.
  • hit a highwater of 8 connections being checked at once.

This is up from last week, although the messages received count remains down from the usual levels.

Day Connections different IPs
Sunday 29,942 +11,252
Monday 30,350 +9,115
Tuesday 29,884 +8,506
Wednesday 28,581 +8,341
Thursday 23,071 +7,064
Friday 30,424 +8,093
Saturday 25,577 +6,475

This has an interesting general decline in the number of new different IP addresses talking to us over the week (and the general Thursday dip also makes me wonder).

Kernel level packet filtering top ten:

Host/Mask           Packets   Bytes          19714   1084K       15468    751K          13923    724K         11192    672K       10640    482K           4493    216K            3979    212K            3645    170K           2383    143K         2245    135K

This is down from last week, partly because at least some of the active webmail subnets seem to have quieted down a bit.

  • and kept trying to send stuff with origin addresses that had tripped our spamtraps.
  • reappears from last week.
  • is in acceleratebiz.com IP address space, and we don't talk to that any more. Considering its current hostname is 'mail.thefreebiediscount.com', I can't imagine that we're missing much.
  • is a telecomitalia.it IP address and returns from earlier this month.
  • kept trying with a bad HELO name.
  • is a Taiwanese IP address with no reverse DNS.

Connection time rejection stats:

  62832 total
  38554 dynamic IP
  17429 bad or no reverse DNS
   5222 class bl-cbl
    262 acceleratebiz.com
    185 class bl-sbl
    160 class bl-pbl
    154 class bl-sdul
    127 dartmail.net
    101 class bl-dsbl
     94 cuttingedgemedia.com
     72 class bl-njabl

(Note that I don't always put specific domain blocks in this list, even if they show up in the overall numbers.)

The highest SBL source this week is SBL52715 (a spam source and landing pages /27, listed only today) at 108 rejections. Next is SBL50181 (good old microcamp.com.br's compromised web server, listed since January 18th) at 37 rejections.

Nine of the top 30 most rejected IP addresses were rejected 100 times or more this week; the leaders are (455 rejections, bad reverse DNS), (247 rejections, generic fastwebnet.it), (221 rejections, bad reverse DNS), and (217 rejections, verizon dynamic IP). It's striking that only two out of the nine are not in zen.spamhaus.org.

Fourteen of the top 30 are currently in the CBL, twelve are currently listed in bl.spamcop.net, fourteen are currently in the PBL, and a grand total of 20 are in zen.spamhaus.org.

This week Hotmail had:

  • no messages accepted.
  • no messages rejected because they came from non-Hotmail email addresses.
  • 32 messages sent to our spamtraps.
  • no messages refused because their sender addresses had already hit our spamtraps.
  • 5 messages refused due to their origin IP address (two in the CBL, two from Nigeria, and one in SBL49971.)

And the final numbers:

what # this week (distinct IPs) # last week (distinct IPs)
Bad HELOs 561 81 556 79
Bad bounces 2 2 13 7

Now those are the sort of numbers on bad bounces that I like to see. As usual, bad HELOs have no sources that particularly stand out; the highest is (63 rejections).

Bad bounces were sent to two different bad usernames this week. Both went to plausible usernames that have never existed here (to the best of my memory), and this week they both came from machines in the USA.

Written on 24 March 2007.
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Last modified: Sat Mar 24 23:37:43 2007
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