RE: 2300 FTP accesses from Korea

From: Tom Laermans (tom.laermansat_private)
Date: Tue Jun 19 2001 - 04:09:49 PDT

  • Next message: Ryan Russell: "RE: What is up with i.gtld-servers.net?"

    Hi,
    
    At 23:15 18/06/2001, you wrote:
    >Thanks to everyone for the excellent suggestions.  I dug a little deeper 
    >and found that this was indeed a brute force attack.
    >But not for user id and password.  They always logged in as the anonymous 
    >user.  What they were trying to get to was a hidden file on this 
    >site.  (All directory listings are hidden and the user must know the exact 
    >filename to be able to download.)
    
    So they just kept on guessing the different filenames or what?
    
    
    >Check this out...
    >
    >Edited for space and clarity (and a little obfuscation).  All connections 
    >are from 211.203.38.222.
    >
    >"[16/Jun/2001:07:02:42 -0700]","USER anonymous","331"
    >"[16/Jun/2001:07:02:42 -0700]","TYPE I","200"
    >"[16/Jun/2001:07:02:42 -0700]","PASS getright@","230"
    
    This shows that it was getright download manager (www.getright.com) .. With 
    a very large download list :-)
    
    >"[16/Jun/2001:07:02:42 -0700]","SIZE /download/pc/blah4702.exe","550"
    >"[16/Jun/2001:07:02:42 -0700]","SIZE download/pc/blah4702.exe","550"
    >"[16/Jun/2001:07:02:43 -0700]","SIZE /download/pc/blah4703.exe","550"
    [snip]
    
    >"[16/Jun/2001:07:03:05 -0700]","SIZE /download/pc/blah4709.exe","550"
    >"[16/Jun/2001:07:03:05 -0700]","SIZE download/pc/blah4709.exe","550"
    >"[16/Jun/2001:07:03:12 -0700]","SIZE /download/pc/blah4710.exe","550"
    >"[16/Jun/2001:07:03:12 -0700]","SIZE download/pc/blah4710.exe","550"
    
    It was probably set on auto-retry forever, and the program just kept on trying.
    When it can't open a file like "/download/pc/blah4709.exe" it tries without 
    leading backslash, which leads to 2 requests for one file.
    
    They just kept on going for every combination or something?
    
    -Tom
    
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